CPK


Line plots across dimensions of each concept
Line plots across concepts
Tables

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementEquityComponents
us-gaap:SharesIssued

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:PlanName

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:IncomeLossFromContinuingOperations
us-gaap:StatementEquityComponents
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeTaxExpenseBenefit
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:InterestExpense

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome
us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:OperatingCostsAndExpenses

us-gaap:OperatingExpenses

us-gaap:OperatingIncomeLoss
us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:RegulatedOperatingRevenue

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
dei:LegalEntity
dei:LegalEntity, us-gaap:ProductOrService
dei:LegalEntity, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:Revenues
dei:LegalEntity, us-gaap:StatementBusinessSegments
us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:UnregulatedOperatingRevenue

us-gaap:Assets
us-gaap:ConsolidationItems
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:StatementBusinessSegments

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:AccountsReceivableNetCurrent

us-gaap:OtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentGross
us-gaap:PublicUtility
us-gaap:StatementGeographical, us-gaap:PublicUtility

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:PropertyPlantAndEquipmentNet
us-gaap:PropertyPlantAndEquipmentByType

us-gaap:Goodwill
us-gaap:StatementBusinessSegments

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:AccountsPayableCurrent

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:DividendsPayableCurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:LongTermDebt
us-gaap:CreditFacility
us-gaap:DebtInstrument

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:OperatingLeaseLiability

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:CommonStockValue

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:TreasuryStockValue
us-gaap:StatementEquityComponents
us-gaap:NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DepreciationDepletionAndAmortization

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:Dividends
us-gaap:StatementEquityComponents
us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
us-gaap:StatementGeographical, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
cpk:AdditionalFirmNaturalGasTransportationDeliverability
us-gaap:StatementGeographical
cpk:AmountsSpenttoRestoreService
us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments
cpk:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRegulatoryLiabilities
us-gaap:StatementGeographical
cpk:CostRecoveryCapital

cpk:DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset
us-gaap:RetirementPlanName

cpk:DefinedBenefitPlanAmountsRecognizedGainLoss
us-gaap:RetirementPlanName

cpk:DepreciationAndAccretionIncludedInOtherCosts

cpk:DepreciationandAmortizationCosts

cpk:DiscontinuedOperationGainLossfromDisposalofDiscontinuedOperationbeforeIncomeTaxIncremental

cpk:FeesOnEquityIssuanceAtTheMarket
us-gaap:SubsequentEventType
us-gaap:DisposalGroupClassification, us-gaap:StatementBusinessSegments
cpk:GainLossFromDiscontinuedOperations

cpk:IncrementalRevenueStormCostRecovery
dei:LegalEntity
cpk:MaximumAmountOfEnvironmentalCostsThatCanBeRecoveredFromInsuranceAndCustomers

cpk:NumberofDisposalTransactions
us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments
cpk:Numberofcustomersacquiredthroughacquisition

cpk:Operations
us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
cpk:OtherComprehensiveIncomeLossAdjustmentsAOCISwapAgreements
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

cpk:OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax

cpk:PaymentsForEnvironmentalExpenditures
us-gaap:RetirementPlanName
cpk:PeriodicCostBenefit

cpk:ProceedsFromIssuanceOfCommonStockAtTheMarket
us-gaap:SubsequentEventType

cpk:ProceedsfromDivestitureofBusinessesIncremental

cpk:RegulatedEnergyCostOfSales

cpk:RegulatoryAssetStormCostRecovery

cpk:SettlementGain
us-gaap:PlanName
cpk:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpirationsWeightedAverageGrantDateFairValue
us-gaap:PlanName
cpk:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriod

cpk:StandbyLettersOfCredit
us-gaap:StatementEquityComponents
cpk:StockIssuedDuringThePeriodSharesRetirementSavingsPlanAndDividendReinvestmentPlan

cpk:StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan
us-gaap:StatementEquityComponents

cpk:SurchargeStormCostRecovery
us-gaap:StatementEquityComponents
cpk:TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue

cpk:UnregulatedEnergyAndOtherCostOfSales

us-gaap:AllocatedShareBasedCompensationExpenseNetOfTax

us-gaap:AllowanceForDoubtfulAccountsReceivableRecoveries

us-gaap:AllowanceForLoanAndLeaseLossesWriteOffs
us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments
us-gaap:BusinessCombinationConsiderationTransferred1
dei:LegalEntity
us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
us-gaap:DerivativeInstrumentRisk

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:DefinedBenefitPlanActuarialGainLoss
us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:RetirementPlanName
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanContributionsByEmployer
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanInterestCost
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DerivativeGainLossOnDerivativeNet
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
dei:LegalEntity, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeNonmonetaryNotionalAmountVolume

us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare
us-gaap:DisposalGroupClassification
us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare
us-gaap:StatementBusinessSegments
us-gaap:DiscontinuedOperationIntraEntityAmountsDiscontinuedOperationAfterDisposalRevenue
us-gaap:DisposalGroupClassification
us-gaap:DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation
us-gaap:DisposalGroupClassification
us-gaap:DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold
us-gaap:DisposalGroupClassification
us-gaap:DisposalGroupIncludingDiscontinuedOperationInterestExpense
us-gaap:DisposalGroupClassification
us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingExpense
us-gaap:DisposalGroupClassification
us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
us-gaap:DisposalGroupClassification
us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue

us-gaap:EmployeeBenefitsAndShareBasedCompensation

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
dei:LegalEntity
us-gaap:EnvironmentalCostsRecognizedRecoveryCreditedToExpense
us-gaap:Range, us-gaap:StatementGeographical
us-gaap:EnvironmentalExitCostsReasonablyPossibleAdditionalLoss
us-gaap:Range, us-gaap:StatementGeographical
us-gaap:EnvironmentalRemediationExpense

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

us-gaap:GainLossOnDispositionOfAssets

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities

us-gaap:IncreaseDecreaseInIncomeTaxesReceivable

us-gaap:IncreaseDecreaseInOtherCurrentLiabilities

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets

us-gaap:IncreaseDecreaseInOutstandingChecksFinancingActivities

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInRegulatoryAssetsAndLiabilities

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:LeaseCost

us-gaap:NotionalAmountOfNonderivativeInstruments
us-gaap:SubsequentEventType

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent
us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation
us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax
us-gaap:RetirementPlanName
us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents
us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation
us-gaap:PlanName

us-gaap:PaymentsToAcquireBusinessesGross

us-gaap:ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan
us-gaap:SubsequentEventType

us-gaap:ProceedsFromIssuanceOrSaleOfEquity

us-gaap:ProceedsFromRepaymentsOfLinesOfCredit

us-gaap:ProceedsFromSaleOfProductiveAssets

us-gaap:ProvisionForOtherCreditLosses

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
us-gaap:StatementEquityComponents
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation
us-gaap:AwardType

us-gaap:StockIssuedDuringPeriodSharesDividendReinvestmentPlan
us-gaap:SubsequentEventType
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueDividendReinvestmentPlan
us-gaap:SubsequentEventType

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:TaxesOther

us-gaap:TradingSecuritiesUnrealizedHoldingGainLoss

us-gaap:UnrealizedGainLossOnCommodityContracts

cpk:AccountsReceivableAllowanceForCreditLossesCurrentDisclosure

cpk:AccountsReceivableAllowanceforCreditLossesCurrentDisclosure

cpk:AccruedRevenue

cpk:AccumulatedOtherComprehensiveIncomeLossTaxEffect
dei:LegalEntity
cpk:BusinessAcquisitionPremiumPaid
us-gaap:DisposalGroupClassification
cpk:BusinessCombinationWorkingCapital

cpk:COVID19RegulatoryAsset

cpk:COVID19SettlementAmount

cpk:CommonStockSharesIssuedAtTheMarket
us-gaap:SubsequentEventType

cpk:ConstructionWorkInProgress

cpk:ConstructionWorkinProgress

cpk:CumulativeConsolidatedNetIncome

cpk:DeferredChargesAndOtherAssets

cpk:DeferredIncomeTaxLiabilityDeferredGasCosts

cpk:DeferredIncomeTaxLiabilityNaturalGasConversionCosts

cpk:DeferredIncomeTaxLiabilityStormReserve

cpk:DeferredIncomeTaxOnAcquisitionAdjustment

cpk:DeferredTaxAssetsEnvironmental

cpk:DeferredTaxAssetsOperatingLossCarryforwardsTotal

cpk:DeferredTaxLiabilitiesLossOnReacquiredDebt
us-gaap:RetirementPlanType
cpk:DefinedBenefitPlanAccruedPensionCostsAccruedExpensesEmploymentBenefits

cpk:DefinedBenefitPlanAlternativeInvestmentsFairValueofPlanAssets
us-gaap:FairValueByFairValueHierarchyLevel
cpk:DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:RetirementPlanType
cpk:DefinedBenefitPlanPercentageOfPlanAssetsByInvestmentType

cpk:DefinedBenefitPlanPostMergerRegulatoryAssets
us-gaap:RetirementPlanType
us-gaap:CreditFacility
cpk:FixedSwapRate
us-gaap:SubsequentEventType

cpk:LesseeFutureOperatingLeaseOptionPayments

cpk:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearSix

cpk:LesseeOperatingLeaseLiabilityPaymentsDueYearSix

cpk:LongtermDebtandCapitalLeaseObligationsNetofCurrentMaturities

cpk:NetOperatingLossesAndTaxCarryback

cpk:NetOperatingLossesAndTaxCarrybackTotal
us-gaap:IncomeTaxAuthority
cpk:NetOperatingLossesAndTaxCarryforwards
us-gaap:StatementGeographical, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject
cpk:NumberofMainlinePipelineMiles
dei:LegalEntity
cpk:OneTimeBillCreditRelatedToTCJA
dei:LegalEntity
cpk:OnetimebillcreditrelatedtoTCJA

cpk:ReceivablesAndOtherDeferredCharges
dei:LegalEntity, us-gaap:StatementBusinessSegments
cpk:RegulatoryAssetsRelatedToEnvironmentalCosts

cpk:RestrictedPayment

cpk:SharesHeldInTrustForDeferredCompensationPlan

cpk:SharesIssuedPricePerShareAtTheMarket
us-gaap:SubsequentEventType

cpk:TotalFinanceandOperatingLeaseRightofUseAsset

cpk:TotalFutureRepayments

cpk:TotalOperatingandFinanceLeaseLiabilities

cpk:UnregulatedEnergyPropertyPlantAndEquipment

cpk:UnrestrictedPayment

dei:EntityCommonStockSharesOutstanding

us-gaap:AccountsReceivableGrossCurrent

us-gaap:AccruedEnvironmentalLossContingenciesNoncurrent
dei:LegalEntity

us-gaap:AllowanceForDoubtfulAccountsReceivableCurrent
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:AssetsFairValueDisclosure
us-gaap:FairValueByMeasurementFrequency

us-gaap:BankOverdrafts

us-gaap:CapitalizationLongtermDebtAndEquity

us-gaap:CompensationAndBenefitsTrust
us-gaap:RetirementPlanName

us-gaap:ContractWithCustomerAssetNetNoncurrent

us-gaap:ContractWithCustomerRefundLiabilityCurrent

us-gaap:ContributionsInAidOfConstruction
us-gaap:Range, us-gaap:CreditFacility
us-gaap:DebtInstrumentFaceAmount

us-gaap:DebtInstrumentUnusedBorrowingCapacityAmount
us-gaap:CreditFacility
us-gaap:RetirementPlanName
us-gaap:DeferredCompensationEquity

us-gaap:DeferredCreditsAndOtherLiabilities

us-gaap:DeferredIncomeTaxLiabilities
us-gaap:StatementGeographical
us-gaap:DeferredStormAndPropertyReserveDeficiencyNoncurrent

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DefinedBenefitPlanAccumulatedBenefitObligation
us-gaap:RetirementPlanType

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanBenefitObligation
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear
us-gaap:RetirementPlanName
us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsRemainderOfFiscalYear
us-gaap:DefinedBenefitPlanByPlanAssetCategories
us-gaap:DefinedBenefitPlanFairValueOfPlanAssets
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByAssetClass
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DefinedBenefitPlanByPlanAssetCategories, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:RetirementPlanType
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanFundedStatusOfPlan
us-gaap:RetirementPlanType
us-gaap:DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear
us-gaap:Range, us-gaap:FairValueByAssetClass
us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:DerivativeAssets
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByLiabilityClass
us-gaap:DerivativeLiabilities
us-gaap:FairValueByLiabilityClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
us-gaap:PlanName

us-gaap:EnergyMarketingContractLiabilitiesCurrent
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation
us-gaap:FairValueByMeasurementFrequency

us-gaap:EnergyMarketingContractsAssetsCurrent
us-gaap:BalanceSheetLocation, us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation

us-gaap:EnergyRelatedInventoryNaturalGasInStorage

us-gaap:EnergyRelatedInventoryPropaneGas

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearThree

us-gaap:FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo

us-gaap:FiniteLivedIntangibleAssetsGross
dei:LegalEntity, us-gaap:FiniteLivedIntangibleAssetsByMajorClass
us-gaap:FiniteLivedIntangibleAssetsByMajorClass

us-gaap:GuaranteeObligationsCurrentCarryingValue

us-gaap:GuaranteeObligationsMaximumExposure

us-gaap:IncomeTaxesReceivable

us-gaap:InterestPayableCurrent

us-gaap:InvestmentsFairValueDisclosure
us-gaap:FairValueByAssetClass
us-gaap:FairValueByAssetClass, us-gaap:FairValueByFairValueHierarchyLevel
us-gaap:FairValueByAssetClass, us-gaap:FairValueByMeasurementFrequency

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:CreditFacility

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent

us-gaap:LongTermDebtFairValue

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFive

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFour

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree

us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo

us-gaap:OperatingLeaseWeightedAverageDiscountRatePercent

us-gaap:OtherInventory
dei:LegalEntity
us-gaap:OtherPayablesToBrokerDealersAndClearingOrganizations

us-gaap:PrepaidExpenseCurrent

us-gaap:PropertyPlantAndEquipmentOther

us-gaap:PublicUtilitiesPropertyPlantAndEquipmentPlantInService

us-gaap:PurchaseObligation

us-gaap:PurchaseObligationDueAfterFifthYear

us-gaap:PurchaseObligationDueInFourthAndFifthYear

us-gaap:PurchaseObligationDueInNextTwelveMonths

us-gaap:PurchaseObligationDueInSecondAndThirdYear
dei:LegalEntity
us-gaap:ReceivablesFromBrokersDealersAndClearingOrganizations

us-gaap:ReceivablesFromCustomers

us-gaap:RegulatoryAssets
us-gaap:RegulatoryAsset

us-gaap:RegulatoryAssetsCurrent

us-gaap:RegulatoryAssetsNoncurrent

us-gaap:RegulatoryLiabilities
dei:LegalEntity
us-gaap:RegulatoryAsset
us-gaap:RegulatoryLiability

us-gaap:RegulatoryLiabilityCurrent

us-gaap:RegulatoryLiabilityNoncurrent
us-gaap:StatementBusinessSegments
us-gaap:RevenueRemainingPerformanceObligation
us-gaap:PlanName
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
us-gaap:PlanName
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested

us-gaap:ShortTermBorrowings

us-gaap:ShortTermDebtWeightedAverageInterestRate

us-gaap:UnamortizedDebtIssuanceExpense

Plots across concepts


IncomeStatement
Other Comprehensive Income Loss Net Of Tax
Expenses
Allocated Share Based Compensation Expense
Balance Sheet
Cash And Cash Equivalents At Carrying Value
Assets
Cash And Cash Equivalents At Carrying Value
Current Assets
Other Assets Current
NonCurrent Assets
Intangible Assets Net Excluding Goodwill
PropertyPlantAndEquipmentNet
Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
Liabilities
Operating Lease Liability
Current Liabilities
Contract With Customer Liability Current
Noncurrent Liabilities
Other Liabilities Noncurrent
Stockholders Equity
Accumulated Other Comprehensive Income Loss Net Of Tax
Per Share
Common Stock Dividends Per Share Declared
CashFlow
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInOperatingActivities
Increase Decrease In Accounts Receivable
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Shares Outstanding Basic
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Remainder Of Fiscal Year
AccountsReceivable
Allowance For Doubtful Accounts Receivable Current

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:CommonStockValue ███▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▆▆▆▆▆▅▅▅▁▁▁▁▁▁▁▁▁▁▁▁▁8.558.5288.4998.1268.0137.9987.9847.9847.9847.987.9717.9717.9717.9647.9557.9557.9557.9497.9357.9327.4567.4497.4327.4297.4197.1197.17.0954.7274.7154.6914.6854.6844.6794.6714.6694.6684.6614.6564.6554.654NA4.635NANA
 us-gaap:SharesIssued us-gaap:StatementEquityComponents us-gaap:CommonStockNANA17.461841NA16.46380816.43310516.40377616.40377616.40377616.39701716.37854516.37854516.37854516.36379216.34444216.34444216.34444216.33188916.30349916.29728715.31987815.30496815.27065915.26367315.24296714.62798914.58871114.5776459.7115719.6876789.638239.6260139.6250749.6140629.5974999593.0969.5918659.5775429.5673079.5646669.562318NA9.524195NANA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁17.61649617.553167NA16.59284216.50360316.471827NA16.45386716.44574316.432852NA16.42843916.41708216.402985NA16.38963516.38220716.363796NA15.41278315.35270215.331912NA15.30684315.28065714.65631NA14.6166659.7378529.693434NA9.7023349.695479.67895NA9676.6589.6815979.666885NA9.657979.6508879.633796NA9.4976969.557352
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁17.54634617.485866NA16.53374816.4484916.414773NA16.40377616.40102816.384927NA16.37854516.36964116.351338NA16.34444216.34066516.317224NA15.37241315.3150215.286842NA15.25881915.2358614.604841NA14.5746789.7041619.658431NA9.6254359.621589.601529NA9592.4179.5861599.57127NA9.5640129.5577079.535381NA9.4934259.467222
us-gaap:EarningsPerShareBasic ▃█▅▃▃▇▆▂▂▇▅▂▂▇▇▂▂▅▃▁▂▆▃▂▂▆▃▁▂▇▄▂▂▆▄▂▂▅▄▁▂▆▃▁▂0.791.971.280.560.671.761.380.340.511.751.090.340.391.641.60.420.371.170.730.290.521.330.560.340.411.450.690.220.531.831.010.40.451.551.030.340.531.120.830.250.371.440.750.170.35
us-gaap:EarningsPerShareDiluted ▃█▅▃▃▇▂▂▂▇▅▂▂▇▇▂▂▅▃▁▂▆▃▂▂▆▃▁▂▇▄▂▂▆▄▂▂▅▄▁▂▆▃▁▂0.781.961.280.560.661.760.330.340.51.741.080.340.391.641.590.420.371.170.730.290.521.330.560.330.411.440.690.220.531.821.00.40.451.541.020.330.521.110.830.250.371.430.750.170.35
us-gaap:IncomeLossFromContinuingOperationsPerBasicShare ▃█▅▂▂▇▄▁▂▇▄▁▁▇7.900000000000001e-071.9699999999999998e-061.24e-065.6e-076.5e-071.77e-061.0500000000000001e-063.8e-075.4e-071.76e-061.0900000000000002e-063.7e-073.5e-071.6699999999999999e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare ▃█▅▂▂▇▅▁▂▇▄▁▁▇7.8e-071.96e-061.24e-065.6e-076.4e-071.77e-061.37e-063.8e-075.4e-071.75e-061.0900000000000002e-063.7e-073.5e-071.66e-06NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 Operating Margin us-gaap:BusinessAcquisition,us-gaap:StatementBusinessSegments cpk:Boulden,cpk:UnregulatedEnergyNANANA0.40.82.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:BusinessAcquisition,us-gaap:StatementBusinessSegments cpk:ElktonGas,cpk:RegulatedEnergy▁█0.52.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:BusinessAcquisition,us-gaap:StatementBusinessSegments cpk:WesternNaturalGas,cpk:UnregulatedEnergy▁█0.60.8NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:StatementBusinessSegments cpk:RegulatedEnergy▂█▄▃▁▅▄▂▁▆▄▁▁▆80.91121.19793.51182.76273.518102.95591.40574.5873.403103.61892.61472.7770.504109.393NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 Operating Margin us-gaap:StatementBusinessSegments cpk:UnregulatedEnergy▂▄▂▁▁▃▂▁▄█▇▄▄█34.77374.75948.0622.71427.74154.03145.16522.27966.904138.102122.86376.04276.345145.367NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 TTM Greenblatt ROC _ _▄█▆▃▃▇▅▂▃▇▅▂▂▆▄▂▂▅▃▂▃▆▃▂▂▆▂▁▂▅▃▁▂▄▃▁▂▃▃▁▁▄22.57851.59735.20617.40617.97742.11329.64214.35817.43643.99328.9312.03613.24840.40623.26314.23913.66634.67621.81910.15615.74236.3816.17110.90913.1737.50812.4087.79210.45731.62318.3128.729.15226.5518.5437.56410.45520.07315.4955.5947.77624.839NANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AllocatedShareBasedCompensationExpense ▆█▅▆▅▄█▅▃▂▁▁▅▆▄▃▁▃▂▃▃▃▂▂▂▂▂▂▂▃▂▂▂▂▂▂▂▂▂▂▂1.4391.8761.1751.3321.2661.0561.9741.210.6090.4870.2780.2881.3251.520.8820.7960.1730.6390.480.6230.6150.6490.4920.4990.410.5370.4390.4540.4270.6380.3850.3850.4610.3810.3080.4150.3510.3450.3720.3730.376NANANANA
us-gaap:ComprehensiveIncomeNetOfTax ▄█▅▃▃▇▅▂▂▇▄▂▂▆▆▂▂▅▃▁▂▅▂▂▂▅▂▁▂▄▃▁▁▄▂▁▂▃▂▁▁▄17.00934.69323.11610.09412.68829.00321.626.0456.29631.75316.0756.2687.54225.16127.0886.825.2619.56412.0144.5558.61220.4568.255.1276.38321.2176.893.1835.16417.71212.0533.9344.41114.9189.1223.2865.12710.7946.2482.5793.56414.064NANANA
us-gaap:IncomeLossFromContinuingOperations ▃█▅▂▂▇▄▁▂▇▄▁▁▆13.81534.47221.6619.2810.66129.02617.1696.2458.91328.81417.7966.095.70527.271NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedgesNANA0.8470.1160.2381.2272.8180.6340.1270.044-1.01-0.461-0.373-0.616-1.264-0.6530.7081.538-0.1190.1050.211-0.471-0.1510.0-0.01-0.043-0.7520.00.0020.0NANANANANANANANANANANANANANANA
 us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedgesNANANA0.0340.011NANANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments ▄█▅▃▃▇▄▂▂▇▄▂▂▆▄▂▂▆▄▂▃▆▃▂▂▆▃▁▂▅▃▂▂▅▃▁▂▃▃▁▂▄▃▁▁18.9846.87729.11712.78212.64439.61722.9018.60511.46538.23824.0647.5959.10536.8119.62911.1579.98631.6618.8037.40613.1133.69613.8868.45310.51435.19316.7395.2658.55929.47416.1516.7957.1624.76716.5125.3028.36717.97813.3573.8545.68922.71111.9552.4295.445
us-gaap:IncomeTaxExpenseBenefit ▅▇▆▄▄▇▅▄▄▆▅▄▄▇▁▅▅▇▆▄▅█▅▄▅█▅▄▄▇▅▄▄▇▅▄▄▆▅▄▄▆▅▃▄5.16512.4057.4563.5021.98310.5915.7362.363.1619.5746.2632.0572.7189.955-6.4724.3243.9412.5166.942.995.08113.3295.2673.3344.2214.0846.6422.0853.42511.7936.4682.9162.8049.8986.6552.0833.3077.2515.3991.4572.1698.9644.8410.8012.105
us-gaap:InterestExpense ▆▆█▅▆▇▇▇▇▇▅▅▄▄▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▂▂▁▁▁▁▁5.0545.1056.3134.5845.0545.8145.6415.4035.6555.714.4554.433.8813.6643.5123.3213.0732.7392.6432.7222.6242.652.5812.4922.4852.4482.5282.4952.3032.1552.122.0262.0162.0722.092.1262.2412.2912.3462.3892.1142.152.2222.2562.305
us-gaap:NetIncomeLoss ▄█▅▃▃▇▅▂▂▇▄▂▂▆▆▂▂▅▃▂▂▅▂▂▂▅▃▁▂▄▃▁▂▄▃▁▂▃▂▁▁▄▂▁▁13.81334.46622.3529.26110.95628.9322.5625.6218.30428.66417.8015.5386.38726.85526.1016.8336.04619.14411.8634.4168.02920.3678.6195.1196.29421.10910.0973.185.13417.6819.6833.8794.35614.8699.8573.2195.0610.7277.9572.3973.5213.7477.1141.6283.34
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome▄█▄▃▃▅▄▄▃▃▁▂▂▂▁▂▄▅▂▃▃▂▃▃▃▃▂▃▃▃0.2812.1450.4570.0430.1140.8220.4530.355-0.014-0.068-0.88-0.418-0.362-0.538-0.86-0.4960.3460.849-0.284-0.0240.042-0.372-0.191-0.083-0.089-0.108-0.489-0.03-0.03-0.031NANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges▄█▄▃▃▅█▄▃▃▁▂▂▂▁▂▄▅▃▃▃▂▃▃▃▃▂▃▃▃0.3292.2050.6130.0840.1720.8882.0080.4550.0930.039-0.716-0.332-0.268-0.444-0.795-0.4050.4350.94-0.0730.0640.13-0.283-0.090.0-0.006-0.026-0.4490.00.0010.0NANANANANANANANANANANANANANANA
 us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,us-gaap:StatementEquityComponents us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome,cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges█▁0.0160.003NA0.0250.008NANANA0.0NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingCostsAndExpenses ▆▅▃▂▅▃█▄▁4.2594.0423.8923.7174.1433.8364.4793.923.6NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OperatingExpenses ▂▅▃▂▁▃▃▁▃▇▇▄▄█▆▃▃▅▄▃▂▃▂▂▁▄▃▂▂▆▃▁▂▃▂▁▁▃▂▁▁▄▃▁▁88.504139.59101.83384.01379.074110.556102.33178.268113.467183.623172.26128.243123.416198.95157.14112.697111.418150.484120.05598.19286.6109.91688.39781.00479.512132.573107.97383.82790.04154.714104.57577.82584.994114.17990.97270.61173.442100.84188.49275.01679.055121.758103.57171.88372.3
us-gaap:OperatingIncomeLoss ▄█▆▃▃▇▅▂▃▇▅▂▂▆▄▂▂▅▄▂▃▆▃▂▂▆▂▁▂▅▃▂▂▄▃▁▂▃▃▁▁▄▂▁▁22.57851.59735.20617.40617.97742.11329.64214.35817.43643.99328.9312.03613.24840.40623.26314.23913.66634.67621.81910.15615.74236.3816.17110.90913.1737.50812.4087.79210.45731.62318.3128.729.15226.5518.5437.56410.45520.07315.4955.5947.77624.83914.1884.5837.761
us-gaap:OtherComprehensiveIncomeLossNetOfTax █▅▅▅▆▅▄▅▂█▃▅▆▃▆▄▄▅▅▅▅▅▄▅▅▅▁▅▅▅▇▅▅▅3.1960.2270.7640.8331.7320.073-0.8640.344-2.0083.089-1.7260.731.155-1.6940.987-0.015-0.7860.420.1510.1390.5830.089-0.3690.0080.0890.108-3.2070.0040.0290.0312.370.0550.0550.049NANANANANANANANANANANA
us-gaap:OtherNonoperatingIncomeExpense ▅▃▃▃▂█▁▂▂▃▂▃▂▃▃▃▂▂▂▃▃▃▃▃▂▃▂▃▃▃▃▃▃▃▃▃▃▃▃▄▃▃▃▃▃1.4560.3850.225-0.04-0.2793.318-1.101-0.35-0.316-0.045-0.411-0.011-0.2620.068-0.1220.239-0.607-0.277-0.373-0.028-0.008-0.0340.2960.036-0.1710.133-0.279-0.0320.4050.006-0.0410.1010.0240.2890.059-0.1360.1530.1960.2070.6490.0270.022-0.0110.102-0.011
us-gaap:RegulatedOperatingRevenue ▄█▅▄▃▆▅▃▃▆▅▃▃▇▅▃▃▆▄▃▃▅▂▂▂▇▄▂▂▆▃▁▁▄▂▁▁▃▂▁▁▄▃▁▁80.91121.19793.51182.76273.518102.95591.40574.5873.403103.61892.61472.7770.504109.39387.95769.70370.99697.65479.05970.01967.39589.21666.46463.79662.06109.58277.27459.35661.646102.16672.17455.6855.21681.56666.16352.19655.55372.29663.65553.78954.32784.8772.15553.41252.74
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▂▆▄▂▂▄▃▂▃▇▆▄▄█▅▃▃▆▄▂▂▄▂▂▂▅▃▂▂▆▃▁▂▄▂▁▁▃▂▁▁▄▃▁▁111.082191.187137.038101.41997.051152.71131.97392.626130.903227.616201.19140.279136.664239.356180.403126.936125.084185.16141.874108.348102.342146.296104.56791.91392.682170.081120.3891.619100.497186.337122.88786.54594.146140.729109.51678.17583.897120.914103.98880.6186.831146.597117.75976.46680.061
us-gaap:Revenues ▂▆▄▂▂▄▃▂▃▇▆▄▄█▅▃▃▆▄▂▂▄▂▂▂▅▃▂▂▆▃▁▂▄▂▁▁▃▂▁▁▄▃▁▁111.082191.187137.038101.41997.051152.71131.97392.626130.903227.616201.19140.279136.664239.356180.403126.936125.084185.16141.874108.348102.342146.296104.56791.91392.682170.081120.3891.619100.497186.337122.88786.54594.146140.729109.51678.17583.897120.914103.98880.6186.831146.597117.75976.46680.061
us-gaap:UnregulatedOperatingRevenue ▂▄▃▁▁▃▃▁▃▆█▃▃▇▆▃▃▄▄▂▂▃▂▂▂▃▂▁▂▄▂▂▂▃▂▁▁▂▂▁▂▃▂▁▁30.17269.9960.60118.65723.53349.75558.12118.04657.5123.998156.98567.50966.16129.963125.76857.23354.08887.50673.42238.32934.94757.0842.8728.11730.62260.49943.59627.07134.32179.97347.44528.26236.02554.99139.72623.25925.17644.88737.42223.72129.69258.7542.77520.13424.615
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:Assets ████▇▇▇▇▆▆▇▆▅▅▅▅▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁1972.341953.951932.4871888.0881822.1751788.2191783.1981714.241681.0421682.7971693.6711505.5561462.9411427.451417.4341346.751256.9881238.3111229.2191140.511097.0471081.9841068.5861008.442970.636913.707904.469847.55821.085842.561837.522797.557779.658738.457733.746699.952679.7693.127709.066657.516660.489NA670.993NANA
us-gaap:LiabilitiesAndStockholdersEquity ████▇▇▇▇▆▆▇▆▅▅▅▅▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁1972.341953.951932.4871888.0881822.1751788.2191783.1981714.241681.0421682.7971693.6711505.5561462.9411427.451417.4341346.751256.9881238.3111229.2191140.511097.0471081.9841068.5861008.442970.636913.707904.469847.55821.085842.561837.522797.557779.658738.457733.746699.952679.7693.127709.066657.516660.489NA670.993NANA
us-gaap:StockholdersEquity ██▇▆▆▆▆▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁741.564726.388697.085616.69593.277584.129561.577544.711544.384543.659518.439508.298507.986505.241486.294463.82461.678460.829446.086438.3379.554374.252358.138353.315351.176317.746300.322296.221296.223293.251278.773269.788269.304267.772256.598250.484250.407248.144240.78237.548238.0NA226.239NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AssetsCurrent ▃▄▅▄▂▃▄▃▄▆█▄▃▅▇▅▂▃▅▂▂▂▃▂▁▃▄▂▁▄▄▂▂▂▂▁▁▃▄▃▄110.553128.552136.431119.32198.558111.927134.826114.875124.242153.64191.537128.962116.043137.834178.587149.005102.435118.813141.151102.15686.896100.375112.53887.6978.518113.294122.37388.33380.414119.932126.40997.98295.54393.915100.59786.48978.57103.349127.76111.316120.137NA137.229NANA
us-gaap:CashAndCashEquivalentsAtCarryingValue ▃▃▂▂▂▂▄▂▄▄▃▃▂▃▃▂▁▃▂▁▂▂▂▂▁█▂▁▁▃▂▁▁▂▂▁▁▁▂▁▁▁▁▂▅5.0115.5753.4993.0563.593.9826.9854.327.2547.9756.0896.2154.5125.9965.6143.3862.4195.74.1781.5363.2663.3152.8553.7812.10416.174.5742.2852.5294.7913.3561.7922.212.6083.3612.0461.7372.0472.6371.771.8281.9841.6432.7439.256
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents ▄▅▂▁▂▂▇▃▇█▅5.0115.5753.4993.0563.593.9826.9854.327.2547.9756.089NANANA5.614NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:AccountsReceivableNetCurrent ▂▄▄▃▃▂▃▁▃▆█▃▄▆▇▄▂▄▅▃▂▂▂▂▂▅▄▂▂▇▇▅▅▅▄▂▂▆▇▅▇41.31158.06656.8949.00246.69545.30949.56234.50448.90874.09885.40452.6653.41969.44777.22352.77541.11358.37562.80347.10341.85144.43441.00739.86142.2762.06253.343.2744.85880.31375.29360.57866.93362.89153.78742.10741.61968.97576.60565.69280.381NA88.074NANA
us-gaap:OtherAssetsCurrent ▁▂▁▂▂▄▄▃▅▂▆▃▅▇█▆▃▃▃▁▂▃▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁0.5230.6350.4360.7531.0173.6662.8792.4894.0221.1215.6842.5574.566.7177.264.7972.2871.8042.470.5430.7711.6881.0440.3390.2850.2940.1950.2010.2030.1980.160.160.1650.1460.1320.1210.1550.2190.2190.2120.226NA0.245NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:PropertyPlantAndEquipmentGross ███▇▇▇▇▇▆▆▆▆▅▅▅▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁1987.811936.4741908.9921873.6821816.3961761.4291746.5321688.7931656.6761617.6291569.6831498.5361420.7021324.6991312.1171283.7241267.2591206.5291175.5951124.41076.6581016.6921007.489973.728953.556883.239870.125833.353810.737795.792788.791730.723716.432683.052675.714637.305630.934622.145616.105601.9592.333NA578.991NANA
us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment ██▇▇▇▇▇▆▆▆▅▅▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▁▁▁▁▁393.111380.839368.743358.851357.303345.206336.876330.479321.284312.949294.295295.449287.942279.802270.599267.138260.428250.574245.207237.434229.826222.65215.313210.979205.03198.181193.369192.515186.663179.918174.148171.06165.646160.199155.378150.859146.027141.189137.784133.751129.054NA121.628NANA
us-gaap:PropertyPlantAndEquipmentNet ███▇▇▇▇▇▇▆▆▆▅▅▅▅▄▄▄▄▄▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁1672.8861635.6961601.1781567.351525.361491.7331463.7971460.9541421.0221395.1331383.9721263.331234.6641176.5371126.0271085.6391051.3871018.317986.664936.048908.807881.229854.95819.19790.449709.195689.762679.449660.689643.102631.246609.919593.207552.733541.781523.191509.536497.363487.704478.759471.596NA462.757NANA
us-gaap:Goodwill ████▇▇▇▅▅▅▅▄▄▅▅▅▃▃▃▃▃▃▃▃▃▁▁▁▁▁▁▁▁▁▁▁▁▁▁▇▇38.80338.73138.73136.9332.68432.66832.66821.51625.78525.78525.83719.60419.60422.10422.10421.94415.0715.0715.0715.0715.0715.0714.54816.04816.0484.9524.9524.6254.6254.6254.3544.7164.7164.5434.094.094.094.094.0935.61335.613NA35.613NANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▇██▇▇██▃▅▅▆▄▄▄▄▄▁▁▁▁▁▁▂▂▂▂▂▂▂▂▂▂▃▂▂▂▂▂▃▃▃7.6257.9588.2927.2157.527.8248.1293.2725.6115.9096.2074.0734.2774.4824.6864.6081.6641.7521.8431.9382.0332.1282.2222.3172.4152.3162.4042.6752.7752.8752.9753.0753.1753.0172.7982.8792.9613.0443.1273.213.293NA3.459NANA
us-gaap:DeferredTaxAssetsLiabilitiesNet NANA205.388NANANA180.656NANANANANANANANANANANANANANANANANANANA-161.064NANANA-140.901NANANA124.414NANANA112.912NANANANANANA
us-gaap:OperatingLeaseRightOfUseAsset ▁▂▄▄▅▆▆▇█10.0210.5111.19411.07711.54611.69611.56312.00412.404NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:AccountsPayableCurrent ▂▃▃▂▂▃▃▃▂▄█▃▃▃▄▃▃▂▃▂▁▁▂▂▂▂▂▁▁▃▃▂▂▂▂▁▁▂▃▂▃49.40858.16760.25346.49246.38252.56854.06853.1550.64575.277129.80460.22860.76957.45774.68853.28452.10149.556.93541.29735.49636.29939.341.12938.17346.28444.6133.37130.18458.18353.48241.01345.78938.83541.99235.47837.01848.72155.58138.53964.427NA65.541NANA
us-gaap:ContractWithCustomerLiabilityCurrent ▂▃▅█▃▃▅▆▂▂▄▅▁▂▃0.3420.4330.6440.9710.3470.4280.5890.7740.3160.3050.480.5830.1750.2440.407NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:DividendsPayableCurrent █▇▇▆▆▆▆▆▆▅▅▅▅▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁8.4337.7097.6837.2937.2446.6556.6446.6446.6446.0676.066.066.065.3185.3125.3125.3124.9814.9734.6784.6734.44.394.3884.3823.953.9393.9363.9333.733.713.7063.7063.5043.5023.5013.5013.3043.33.33.299NA3.143NANA
us-gaap:LiabilitiesCurrent ▅▄▅▅▆▆▆▇███▆▆▅▆▅▄▅▅▄▄▄▄▃▂▂▂▂▁▃▃▂▂▂▂▁▁▁▂▁▁322.256316.002329.032359.972429.823402.496423.324446.247512.415508.569528.234427.138388.531374.323413.0339.27272.054320.733334.051263.053283.892274.449279.593236.863199.608186.353194.235169.063140.013213.176221.942195.014181.497153.685162.166130.601112.068129.862157.499134.78136.733NA197.642NANA
us-gaap:LongTermDebtCurrent ▂▂▂▂▂▂▅███▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁13.613.613.615.615.615.645.675.675.671.50911.9359.6139.9779.3899.42112.13612.12412.11112.09912.08712.0759.1639.1519.1399.1279.1169.10911.11311.11710.95511.3538.2347.9969.0938.1968.1968.1968.1968.1969.1969.196NA9.216NANA
us-gaap:OperatingLeaseLiabilityCurrent ▇▇█▇▃▁▆1.7321.7241.7471.7331.6471.6081.705NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent ▇▅▅▇█▆▄▅▆▅▄▅▃▂▃▅▄▂▁▃▂▂▁▂▂▂▁▃▃▂▂▃▂▂▁▃▂▂▂▄▄19.81214.3615.2418.53120.92616.1712.07715.2116.52714.71912.82814.81911.4958.69410.27313.97212.0849.2787.06310.268.9787.9427.0599.4438.7567.7976.60310.959.9788.9347.67810.2529.1268.6437.22610.0789.0528.3818.07911.78512.081NA10.393NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:LongTermDebt ████▆▇▇▇▅▅▄▃▃▃▂▃▃▁▁▂▂▂▂▂▂▂▂▂▂▁▁512.9523.0523.0536.5446.5456.6486.6452.1352.1357.2327.2250.7250.7230.1205.2211.4211.4145.8145.9151.8151.8153.6153.7159.9159.9161.4161.5169.7169.7121.2122.0NA108.6110.045110.103116.917116.951NA118.481NANANANANANA
us-gaap:LongTermDebtNoncurrent ████▆▇▇▆▄▄▅▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁498.45508.525508.499519.971430.106440.183440.168375.81275.924285.998316.02241.597241.596222.014197.395201.248201.59136.537136.954143.525143.865148.602149.34155.909156.247158.083158.486165.044165.37117.195117.592107.344107.674100.952101.907108.721108.755NA110.285NANANANANANA
us-gaap:LongTermDebtAndCapitalLeaseObligations ████▇▇▇▇▅▅▅▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁512.05522.125522.099535.571445.706455.783485.768451.41351.524357.507327.955251.21251.573231.403206.816213.384213.714148.648149.053155.913156.252158.088158.491165.048165.374167.199167.595176.157176.487128.15128.945115.578115.67100.952101.907108.721108.755110.236110.285117.069117.123NA89.642NANA
us-gaap:DeferredIncomeTaxLiabilitiesNet █▇▅▅▃▂▁219.49211.801205.388202.649193.595186.431180.656NANANA156.82NANANA135.85NANANA222.894NANANA192.6NANANA161.064NANANANANANANANANANANANANANANANANANA
us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent ▆▆▆▅▅▅▆▅▆▆▆▆▆▆▆▇▇▇▇▇▇▇▇▇▇██▂▂▃▃▇▇█▇▃▅▅▅▁▁29.46329.85630.67327.46228.18528.04330.56927.8929.67529.82228.51328.83928.99628.98129.69932.05931.9233.08232.82832.50132.69532.84833.48132.61933.61434.79835.02718.24620.12320.66221.033.11833.49133.8933.53522.94725.83226.30626.80816.59617.816NA18.199NANA
us-gaap:OtherLiabilitiesNoncurrent ▄▄▄▄▂▂▂▂▂▂▂▂▂▅▅▆▃▄▄▅▅▂▂▂▃▃▃▃▃▂▂▁▁▁▁█▇▇▇▇█4.8134.914.9034.9362.4342.6992.7963.0192.6612.9082.9683.0893.0965.8465.9556.7834.1464.734.755.5335.562.6282.5973.133.824.0073.8253.7753.4912.4842.4772.1021.6251.581.5589.2628.5148.6688.2598.218.911NA9.584NANA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▂▅▄▆▆▅▇█8.7199.1259.8729.68110.05510.1659.89610.39210.71NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo ▁▁██1.7621.771.9841.984NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree ▁▁██1.6071.6151.9231.939NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour ▁▁▅█1.3871.41.6571.874NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive ▁▁▆█0.9510.9661.3951.619NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive ▁▁█3.5963.6214.419NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:StockholdersEquity ██▇▆▆▆▆▅▅▅▅▅▅▅▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁741.564726.388697.085616.69593.277584.129561.577544.711544.384543.659518.439508.298507.986505.241486.294463.82461.678460.829446.086438.3379.554374.252358.138353.315351.176317.746300.322296.221296.223293.251278.773269.788269.304267.772256.598250.484250.407248.144240.78237.548238.0NA226.239NANA
us-gaap:CommonStockValue ███▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇▆▆▆▆▆▅▅▅▁▁▁▁▁▁▁▁▁▁▁▁▁8.558.5288.4998.1268.0137.9987.9847.9847.9847.987.9717.9717.9717.9647.9557.9557.9557.9497.9357.9327.4567.4497.4327.4297.4197.1197.17.0954.7274.7154.6914.6854.6844.6794.6714.6694.6684.6614.6564.6554.654NA4.635NANA
us-gaap:AdditionalPaidInCapitalCommonStock ███▆▅▅▅▅▅▅▅▅▅▅▅▄▄▄▄▄▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁357.52350.875348.482283.836263.272259.521259.253257.436256.385255.307255.651255.509255.356254.126253.47252.722252.071251.144250.967250.202191.776190.389190.311189.321187.903156.749156.581155.407154.619152.862152.341151.676151.391150.527150.75150.23149.908149.252149.403149.091148.796NA148.159NANA
us-gaap:RetainedEarningsAccumulatedDeficit ██▇▇▇▇▆▆▆▆▅▅▅▅▄▄▄▄▄▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁374.936369.623342.969328.357326.454322.804300.607284.694285.762284.111261.53249.805250.377250.024229.141208.402206.896206.194192.062185.195185.49182.165166.235162.036161.333159.446142.317136.188139.35138.176124.274118.33118.187117.579106.23999.912100.22598.69191.24886.61987.549NA76.805NANA
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▅▃▃▃▂▁▁▂▂▃▁▂▂▁▃▂▂▂▂▂▂▂▂▂▂▂▂▄▄▄▄▂▂▂█▂▂▂▂▃▃0.558-2.638-2.865-3.629-4.462-6.194-6.267-5.403-5.747-3.739-6.713-4.987-5.718-6.873-4.272-5.259-5.244-4.458-4.878-5.029-5.168-5.751-5.84-5.471-5.479-5.568-5.676-2.469-2.473-2.502-2.533-4.903-4.958-5.0135.062-4.327-4.394-4.46-4.527-2.817-2.999NA-3.36NANA
us-gaap:TreasuryStockValue ██▆▆▆▆▅▅▅▅▄▄▄▄▄▄▄▄▃▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁▁▁▁▁▁▁▁7.2036.9925.6795.6345.6595.4684.5434.5054.6944.3763.8543.8183.7823.5733.3953.3663.3363.12.4162.4762.4522.2211.8831.8631.8431.7151.2581.2171.2021.1381.1241.111.0960.9940.9820.970.9580.8280.8170.8070.796NA0.777NANA
 us-gaap:NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification us-gaap:StatementEquityComponents us-gaap:RetainedEarningsNANANA0.0NANANA0.00.00.115NANANA-1.498NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆█▅▄▄▆▂▄▄▅▃▃▅▇▃▂▄▆▃▂▄▅▂▂▃▇▃▂▃▅▂▃▃▄▂▂▄▄▃▁▄▄▂▁53.83480.38243.03624.20232.8758.808-0.97529.36434.08940.48618.78219.64441.6866.67211.7172.00236.41659.95421.1468.0731.72742.4286.45810.91323.73464.03714.9246.13812.22345.9996.50412.36419.09534.9681.7763.58325.96334.5518.347-7.31525.81934.276.324-2.22NA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▅▅▆▅▅▆▅▅▅▆▁▆▄▄▆▅▆▆▄▆▆▆▆▆▅▇▇▇▇▇▇▇▆▇▇▇▇█████▇█-52.682-51.847-45.08-56.297-48.756-31.498-46.674-49.033-47.511-43.369-115.097-44.506-63.69-62.971-45.442-52.876-46.384-42.193-63.045-36.859-33.238-36.895-42.573-37.312-58.314-27.359-17.976-26.237-23.912-18.461-29.013-24.843-42.285-18.64-20.659-16.961-19.456-12.753-14.539-11.879-13.198-8.22-19.981-14.655NA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▁▃▄▄▁▅▄▃▃█▄▄▂▅▆▃▂▅▄▃▂▅▄▄▁▃▄▃▁▄▃▄▂▄▃▂▁▃▄▂▁▃▃-1.716-26.4592.48731.56115.494-30.31350.31416.73512.7014.76996.18926.56520.526-3.31935.95351.8416.687-16.23944.54127.0591.462-5.07335.18928.07620.514-25.0825.34119.8559.427-26.10324.07312.06122.792-17.08120.19813.687-6.817-22.387-2.94119.136-12.777-25.70912.56710.362NA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect ▄▇▅▄▄▁█▁▄▇-0.5642.0760.443-0.534-0.392-3.0032.665-2.934-0.7211.886NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:DeferredIncomeTaxExpenseBenefit ▅▅▅▆▅▅▇▄▅▅▆▅▄▅▁▇▅▆▇▅▄▅█▄▄▄█▄▄▄▅▅▅▅▄▅▅▅▅▄▅▆▅▅6.4766.3342.0169.9526.4945.73815.1121.0434.3163.4310.1793.3791.1996.469-18.43517.4864.1857.84919.2535.8421.8364.32621.6750.211-0.87-0.49622.391-0.3220.397-0.2314.9134.1513.5882.2081.7793.543.1895.3733.5311.7343.568.8893.5426.164NA
us-gaap:DepreciationDepletionAndAmortization ▆▇▆█▅▅▄▄▅▄▄▄▄▄▃▃▃▃▃▃▃▃▃▃▃▂▂▂▂▂▂▂▂▂▁▂▂▂▁▁▁▁▁▁▁15.29715.36515.32418.29312.24812.25211.37411.36511.60911.07410.62610.6339.8399.7049.3329.3629.0948.8128.6668.2097.787.5037.8177.6367.5436.9756.176.7746.7366.6355.8946.2745.9775.825.0975.7675.8855.7615.2174.9784.9375.0214.4614.6884.545
us-gaap:IncreaseDecreaseInAccountsReceivable ▂▄▆▄▄▄▅▄▂▃█▄▂▃▇▅▂▄▆▅▄▄▅▄▂▅▆▄▁▄▆▄▄▅▅▄▂▃▅▃▄▄█▄-24.1480.48417.6811.2-3.316-8.13915.508-0.635-33.215-18.14749.299-0.758-22.581-9.64932.41813.95-21.767-5.09523.1786.099-6.0023.7384.801-1.704-28.2088.01417.621-1.591-40.363.64720.677-5.701-2.3898.65714.9740.58-27.343-9.7613.996-14.958-6.551-7.46643.8043.148NA
us-gaap:IncreaseDecreaseInInventories ▆▅▅▅▅▄▅▅▅▃▆▆▆▁▅▇█▃▅▆▆▄▆▅▅▃▅▆▆▂▆▆▆▃▆▆▅▃▆▆▆▃▅▆2.456-1.3711.1151.316-0.219-3.921-0.231-1.5380.749-7.2074.2723.4652.604-12.4480.785.7139.231-6.6880.3522.8422.41-3.0731.6391.2390.932-5.337-0.041.9372.169-8.2433.5593.1132.884-5.0643.1191.6940.414-5.832.6433.1562.462-5.777-0.5623.793NA
us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet █▁4.436-3.761NA-0.122.5511.315NA0.9814.531-3.585NA-1.3182.207-0.347NA-2.9054.885-1.631NA-0.7333.028-1.242NA0.3373.068-2.753NA1.706-0.3030.24NA0.0650.033-0.021NA3.677NANANANANANANANANA
us-gaap:NetCashProvidedByUsedInOperatingActivities ▆█▅▄▄▆▂▄▄▅▃▃▅▇▃▂▄▆▃▂▄▅▂▂▃▇▃▂▃▅▂▃▃▄▂▂▄▄▃▁▄▄▂▁53.83480.38243.03624.20232.8758.808-0.97529.36434.08940.48618.78219.64441.6866.67211.7172.00236.41659.95421.1468.0731.72742.4286.45810.91323.73464.03714.9246.13812.22345.9996.50412.36419.09534.9681.7763.58325.96334.5518.347-7.31525.81934.276.324-2.22NA
us-gaap:NetIncomeLoss ▄█▅▃▃▇▅▂▂▇▄▂▂▆▆▂▂▅▃▂▂▅▂▂▂▅▃▁▂▄▃▁▂▄▃▁▂▃▂▁▁▄▂▁▁13.81334.46622.3529.26110.95628.9322.5625.6218.30428.66417.8015.5386.38726.85526.1016.8336.04619.14411.8634.4168.02920.3678.6195.1196.29421.10910.0973.185.13417.6819.6833.8794.35614.8699.8573.2195.0610.7277.9572.3973.5213.7477.1141.6283.34
us-gaap:ShareBasedCompensation ▆█▅▆▅▄█▅▃▂▁▁▃▆▄▃▁▃▂▃▃▃▂▂▂▂▂▂▂▃▂▂▂▂▂▂▂▂▂▂▂▂▁▁1.4391.8761.1751.3321.2661.0561.9741.210.6080.4870.2780.2880.7271.520.8820.7960.1730.6390.480.6230.6150.6490.4920.4980.410.5370.4390.4540.4270.6380.3850.3850.480.3810.3080.4140.3520.3450.3720.3730.3760.3290.2560.287NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▅▅▆▅▅▆▅▅▅▆▁▆▄▄▆▅▆▆▄▆▆▆▆▆▅▇▇▇▇▇▇▇▆▇▇▇▇█████▇█-52.682-51.847-45.08-56.297-48.756-31.498-46.674-49.033-47.511-43.369-115.097-44.506-63.69-62.971-45.442-52.876-46.384-42.193-63.045-36.859-33.238-36.895-42.573-37.312-58.314-27.359-17.976-26.237-23.912-18.461-29.013-24.843-42.285-18.64-20.659-16.961-19.456-12.753-14.539-11.879-13.198-8.22-19.981-14.655NA
us-gaap:PaymentsToAcquirePropertyPlantAndEquipment ▄▄▄▄▄▃▄▄▄▄█▄▅▅▄▄▄▄▅▃▃▃▄▃▃▂▃▂▂▂▃▂▂▂▂▂▂▁▁▁▁▁▂▁52.63751.99442.0940.64247.59735.18245.41248.87247.22743.21698.35744.59963.69563.11645.19241.5146.45542.17263.0136.80633.19836.84742.56737.33237.21127.50828.18326.22824.28918.46428.54127.35925.00316.21721.02516.84219.39614.74413.6612.14112.8818.35519.43612.601NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
us-gaap:NetCashProvidedByUsedInFinancingActivities ▃▁▃▄▄▁▅▄▃▃█▄▄▂▅▆▃▂▅▄▃▂▅▄▄▁▃▄▃▁▄▃▄▂▄▃▂▁▃▄▂▁▃▃-1.716-26.4592.48731.56115.494-30.31350.31416.73512.7014.76996.18926.56520.526-3.31935.95351.8416.687-16.23944.54127.0591.462-5.07335.18928.07620.514-25.0825.34119.8559.427-26.10324.07312.06122.792-17.08120.19813.687-6.817-22.387-2.94119.136-12.777-25.70912.56710.362NA
us-gaap:ProceedsFromIssuanceOfLongTermDebt NANA-0.00589.84NANA69.83199.861-0.04430.079.918-0.01549.91625.00.0070.069.80.00.00.0NANA0.00.0NANA0.0-0.025NANA20.00.0NANA0.00.0NANANANANANANANANA
us-gaap:RepaymentsOfLongTermDebt NANA13.50.010.130.035.5010.06.0210.4143.8340.36529.7610.4286.590.3454.7490.4166.5650.3551.8240.4026.5580.3283.8580.0768.249-0.0141.5380.1966.5820.0398.5550.0156.7430.0151.4240.027.744-0.0921.4470.0355.6530.93NA
us-gaap:PaymentsOfDividendsCommonStock ██▇▇▆▆▆▆▆▆▆▆▄▄▄▄▄▄▄▄▃▃▃▃▃▂▂▂▂▂▂▂▂▂▂▂▁▁▁▁▁▁▁▁7.5347.5137.1177.0686.4936.4836.4586.4765.8825.8775.8725.875.1545.1475.1485.1444.8214.8154.5184.5114.2494.2044.1994.1933.9593.5733.5683.5653.3853.3693.3653.363.183.1763.1753.1732.9982.9892.992.9882.8492.8362.8262.818NA
us-gaap:Dividends █▇▆▆▆▄▄▄▄▃▃▃▃▂▂▂▂▁▁8.57.8127.747.3587.3066.7036.6516.6896.6536.1986.0766.116.0345.3815.3625.3275.3445.0124.996NANANA4.424.415NANANANA3.6383.78NANANANANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument cpk:FirstMortgageBondDueOnTwoThousandTwentyTwo████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁9.08e-069.08e-069.08e-069.08e-069.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.08e-089.1e-089.08e-089.08e-08NA9.08e-08NANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument cpk:UncollateralizedSeniorNoteDueOnMay2TwoThousandTwentyEight████▁▁▁▁▁▁▁▁6.429999999999999e-066.429999999999999e-066.429999999999999e-066.429999999999999e-066.43e-086.43e-086.43e-086.43e-086.43e-086.43e-086.43e-086.43e-08NANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwenty████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁5.5e-065.5e-065.5e-065.5e-065.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-085.5e-08NANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwentySix████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁5.68e-065.68e-065.68e-065.68e-065.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.6800000000000006e-085.7e-085.6800000000000006e-085.6800000000000006e-08NANANANA5.6800000000000006e-085.7e-08NANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwentyThree████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁5.93e-065.93e-065.93e-065.93e-065.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.93e-085.9e-085.93e-085.93e-08NA5.93e-08NANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument cpk:UncollateralizedSeniorNoteTwoDueonDecemberTwoThousandTwentyEight████▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁3.73e-063.73e-063.73e-063.73e-063.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-083.73e-08NANANANANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value8550000.08528000.08499000.08126000.08013000.07998000.07984000.07984000.07984000.07980000.07971000.07971000.07971000.07964000.07955000.07955000.07955000.07949000.07935000.07932000.07456000.07449000.07432000.07429000.07419000.07119000.07100000.07095000.04727000.04715000.04691000.04685000.04684000.04679000.04671000.04669000.04668000.04661000.04656000.04655000.04654000.04635000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.40.40.40.50.50.50.50.50.50.60.60.60.60.60.60.70.70.70.70.70.80.80.80.80.60.60.60.60.60.60.60.70.70.70.70.70.70.7

Shares Issued

us-gaap:SharesIssued us-gaap:StatementEquityComponents

us-gaap:SharesIssued

us-gaap:CommonStock


Shares
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value171616161616161616161616161616161615151515151414149.7115719.6876789.638239.6260139.6250749.6140629.59749995939.5918659.5775429.5673079.5646669.5623189.5241959.3943146.827121
Percentage of SharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value1717161616161616161616161616151515151514149.7378529.6934349.7023349.695479.6789596769.6815979.6668859.657979.6508879.6337969.4976969.557352
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-30
Value1717161616161616161616161616151515151514149.7041619.6584319.6254359.621589.60152995929.5861599.571279.5640129.5577079.5353819.4934259.467222
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.791.971.280.560.671.761.380.340.511.751.090.340.391.641.60.420.371.170.730.290.521.330.560.340.411.450.690.220.531.831.010.40.451.551.030.340.531.120.830.250.371.440.750.170.35
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.781.961.280.560.661.760.330.340.51.741.080.340.391.641.590.420.371.170.730.290.521.330.560.330.411.440.690.220.531.821.00.40.451.541.020.330.521.110.830.250.371.430.750.170.35
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Basic Share

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare

us-gaap:IncomeLossFromContinuingOperationsPerBasicShare


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.791.971.240.560.651.771.050.380.541.761.090.370.351.67
Percentage of IncomeLossFromContinuingOperationsPerBasicShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Income Loss From Continuing Operations Per Diluted Share

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare

us-gaap:IncomeLossFromContinuingOperationsPerDilutedShare


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.781.961.240.560.641.771.370.380.541.751.090.370.351.66
Percentage of IncomeLossFromContinuingOperationsPerDilutedShare100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:AllocatedShareBasedCompensationExpense


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value1439000.01876000.01175000.01332000.01266000.01056000.01974000.01210000.0609000.0487000.0278000.0288000.01325000.01520000.0882000.0796000.0173000.0639000.0480000.0623000.0615000.0649000.0492000.0499000.0410000.0537000.0439000.0454000.0427000.0638000.0385000.0385000.0461000.0381000.0308000.0415000.0351000.0345000.0372000.0373000.0376000.0
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.31.00.91.31.30.71.51.30.50.20.10.21.00.60.50.60.10.30.30.60.60.40.50.50.40.30.40.50.40.30.30.40.50.30.30.50.40.30.40.50.4

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:PlanName

cpk:Awardstononemployeedirectors


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value192000.0188000.0188000.0188000.0181000.0176000.0157000.0158000.0157000.0149000.0135000.0135000.0135000.0135000.0134000.0134000.0136000.0135000.0135000.0135000.0145000.0165000.0165000.0165000.0160000.0150000.0146000.0137000.0132000.0124000.0124000.0124000.0120000.0111000.0
Percentage of AllocatedShareBasedCompensationExpense13.310.016.014.114.316.78.013.125.830.648.646.910.28.915.216.878.621.128.121.723.625.433.533.139.027.933.330.230.919.432.232.226.029.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.10.10.20.20.10.10.20.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.20.20.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Awardstononemployeedirectors0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:Awardtokeyemployees


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value1247000.01688000.0987000.01144000.01085000.0880000.01817000.01052000.0452000.0338000.0143000.0153000.01190000.01385000.0748000.0662000.037000.0504000.0345000.0488000.0470000.0484000.0327000.0334000.0250000.0387000.0293000.0317000.0295000.0514000.0261000.0261000.0341000.0270000.0
Percentage of AllocatedShareBasedCompensationExpense86.790.084.085.985.783.392.086.974.269.451.453.189.891.184.883.221.478.971.978.376.474.666.566.961.072.166.769.869.180.667.867.874.070.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.10.90.71.11.10.61.41.10.30.10.10.10.90.60.40.50.00.30.20.50.50.30.30.40.30.20.20.30.30.30.20.30.40.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Awardtokeyemployees0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value173423101229216.0456.29631166.2687.54225276.825.2619124.5558.612208.255.1276.383216.893.1835.16417123.9344.411149.1223.2865.127106.2482.5793.56414
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax15.318.116.910.013.119.016.46.54.814.08.04.55.510.515.05.44.210.68.54.28.414.07.95.66.912.55.73.55.19.59.84.54.710.68.34.26.18.96.03.24.19.6

Income Loss From Continuing Operations

us-gaap:IncomeLossFromContinuingOperations

us-gaap:IncomeLossFromContinuingOperations


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1334219.281029176.2458.91328176.095.70527
Percentage of IncomeLossFromContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.418.015.89.211.019.013.06.76.812.78.84.34.211.4

us-gaap:IncomeLossFromContinuingOperations us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Income
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value13349.2810296.2458.914286.09
Percentage of IncomeLossFromContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.418.09.211.019.06.76.812.74.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value847000.0116000.0238000.01227000.02818000.0634000.0127000.044000.0-1010000.0-461000.0-373000.0-616000.0-1264000.0-653000.0708000.01538000.0-119000.0105000.0211000.0-471000.0-151000.00-10000.0-43000.0-752000.002000.00
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.60.10.20.82.10.70.10.0-0.5-0.3-0.3-0.3-0.7-0.50.60.8-0.10.10.2-0.3-0.10.0-0.0-0.0-0.60.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges


Income
Period End2020-09-302020-06-302019-06-30
Value34000.011000.00
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest29.34.60.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges0.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-87000.0-85000.0-249000.0-89000.0-89000.0-89000.0-2101000.0-134000.0-144000.0-144000.0-125000.0-119000.0-130000.0-130000.0-108000.0-152000.0-150000.0-151000.0-354000.0-146000.0-146000.0-148000.0-167000.0-138000.0-138000.0-137000.0-67000.0-51000.0-52000.0-52000.0-188000.0-92000.0-92000.0-92000.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest0.00.0-29.4-76.7-37.4-7.3-74.6-21.1-113.4-327.312.425.834.921.18.523.3-21.2-9.8297.5-139.0-69.231.4110.60.01380.0318.68.90.0-2600.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.0-0.2-0.1-0.1-0.1-1.6-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.2-0.1-0.1-0.1-0.2-0.2-0.1-0.1-0.1-0.1-0.1-0.0-0.2-0.1-0.1-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value184629121239228.6051138247.5959.1053619119.98631187.4061333138.4531035165.2658.55929166.7957.1624165.3028.36717133.8545.68922112.4295.445
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.124.521.212.613.025.917.49.38.816.812.05.46.715.410.98.88.017.113.36.812.823.013.39.211.320.713.95.78.515.813.17.97.617.615.16.810.014.912.84.86.615.50.03.26.8

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value5.165127.4563.5021.983105.7362.363.1619.5746.2632.0572.7189.955-6.4724.3243.94126.942.995.081135.2673.3344.22146.6422.0853.425116.4682.9162.8049.8986.6552.0833.3077.2515.3991.4572.1698.9644.8410.8012.105
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.66.55.43.52.06.94.32.52.44.23.11.52.04.2-3.63.43.16.84.92.85.09.15.03.64.68.35.52.33.46.35.33.43.07.06.12.73.96.05.21.82.56.10.01.02.6

us-gaap:IncomeTaxExpenseBenefit us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value0.1260.8420.2340.0320.0660.3390.810.1790.0340.005-0.294-0.129-0.105-0.172-0.469-0.2480.2730.598-0.0460.0410.081-0.188-0.0610.0-0.004-0.017-0.3030.00.0010.0
Percentage of IncomeTaxExpenseBenefit2.46.83.10.93.33.214.17.61.10.1-4.7-6.3-3.9-1.77.2-5.76.94.8-0.71.41.6-1.4-1.20.0-0.1-0.1-4.60.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.40.20.00.10.20.60.20.00.0-0.1-0.1-0.1-0.1-0.3-0.20.20.3-0.00.00.1-0.1-0.10.0-0.0-0.0-0.30.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges


Income
Period End2021-06-302021-03-312020-09-302020-06-302019-06-30
Value0.0060.0010.0090.0030.0
Percentage of IncomeTaxExpenseBenefit0.10.00.30.20.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges0.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-0.023-0.022-0.082-0.023-0.023-0.023-0.546-0.034-0.037-0.0370.039-0.033-0.036-0.036-0.043-0.061-0.061-0.06-0.143-0.058-0.058-0.059-0.066-0.055-0.055-0.055-0.027-0.021-0.021-0.021-0.075-0.037-0.037-0.037
Percentage of IncomeTaxExpenseBenefit-0.4-0.2-1.1-0.7-1.2-0.2-9.5-1.4-1.2-0.40.6-1.6-1.3-0.40.7-1.4-1.5-0.5-2.1-1.9-1.1-0.4-1.3-1.6-1.3-0.4-0.4-1.0-0.6-0.2-1.2-1.3-1.3-0.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.0-0.0-0.1-0.0-0.0-0.0-0.4-0.0-0.0-0.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.0-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.1-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value5.0545.1056.3134.5845.0545.8145.6415.4035.6555.714.4554.433.8813.6643.5123.3213.0732.7392.6432.7222.6242.652.5812.4922.4852.4482.5282.4952.3032.1552.122.0262.0162.0722.092.1262.2412.2912.3462.3892.1142.152.2222.2562.305
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.52.74.64.55.23.84.35.84.32.52.23.22.81.51.92.62.51.51.92.52.61.82.52.72.71.42.12.72.31.21.72.32.11.51.92.72.71.92.33.02.41.50.03.02.9

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1334229.2611028225.6218.30428175.5386.38726266.8336.04619114.4168.029208.6195.1196.29421103.185.134179.6833.8794.356149.8573.2195.06107.9572.3973.52137.1141.6283.34
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.418.016.39.111.318.917.16.16.312.68.83.94.711.214.55.44.810.38.44.17.813.98.25.66.812.48.43.55.19.57.94.54.610.69.04.16.08.97.73.04.19.40.02.14.2

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value13349.2611028225.6218.30428175.5386.38726266.8336.04619114.4168.029208.6195.1186.29421103.185.134179.6833.8794.356149.8573.2195.06107.9582.397
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.418.09.111.318.917.16.16.312.68.83.94.711.214.55.44.810.38.44.17.813.98.25.66.812.48.43.55.19.57.94.54.610.69.04.16.08.97.73.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss Available To Common Stockholders Basic

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value281000.02145000.0457000.043000.0114000.0822000.0453000.0355000.0-14000.0-68000.0-880000.0-418000.0-362000.0-538000.0-860000.0-496000.0346000.0849000.0-284000.0-24000.042000.0-372000.0-191000.0-83000.0-89000.0-108000.0-489000.0-30000.0-30000.0-31000.0
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.31.10.30.00.10.50.30.4-0.0-0.0-0.4-0.3-0.3-0.2-0.5-0.40.30.5-0.2-0.00.0-0.3-0.2-0.1-0.1-0.1-0.4-0.0-0.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:NetIncomeLossAvailableToCommonStockholdersBasic us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value329000.02205000.0613000.084000.0172000.0888000.02008000.0455000.093000.039000.0-716000.0-332000.0-268000.0-444000.0-795000.0-405000.0435000.0940000.0-73000.064000.0130000.0-283000.0-90000.00-6000.0-26000.0-449000.001000.00
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic117.1102.8134.1195.3150.9108.0443.3128.2-664.3-57.481.479.474.082.592.481.7125.7110.725.7-266.7309.576.147.1-0.06.724.191.8-0.0-3.3-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.31.20.40.10.20.61.50.50.10.0-0.4-0.2-0.2-0.2-0.4-0.30.30.5-0.10.10.1-0.2-0.10.0-0.0-0.0-0.40.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges


Net
Period End2021-06-302021-03-312020-09-302020-06-302019-06-30
Value16000.03000.025000.08000.00
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic5.70.158.17.0-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges0.00.00.00.00.0

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-64000.0-63000.0-167000.0-66000.0-66000.0-66000.0-1555000.0-100000.0-107000.0-107000.0-164000.0-86000.0-94000.0-94000.0-65000.0-91000.0-89000.0-91000.0-211000.0-88000.0-88000.0-89000.0-101000.0-83000.0-83000.0-82000.0-40000.0-30000.0-31000.0-31000.0-113000.0-55000.0-55000.0-55000.0
Percentage of NetIncomeLossAvailableToCommonStockholdersBasic-22.8-2.9-36.5-153.5-57.9-8.0-343.3-28.2764.3157.418.620.626.017.57.618.3-25.7-10.774.3366.7-209.523.952.9100.093.375.98.2100.0103.3100.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.0-0.1-0.1-0.1-0.0-1.2-0.1-0.1-0.0-0.1-0.1-0.1-0.0-0.0-0.1-0.1-0.0-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.0-0.0-0.0-0.0-0.0-0.1-0.1-0.1-0.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome us-gaap:AccumulatedDefinedBenefitPlansAdjustment0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Operating Costs And Expenses

us-gaap:OperatingCostsAndExpenses

us-gaap:OperatingCostsAndExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value4.2594.0423.8923.7174.1433.8364.4793.923.6
Percentage of OperatingCostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.82.12.83.74.32.53.44.22.8

Operating Expenses

us-gaap:OperatingExpenses

us-gaap:OperatingExpenses


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value881391018479110102781131831721281231981571121111501209886109888179132107839015410477841149070731008875791211037172
Percentage of OperatingExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax79.773.074.382.881.572.477.584.586.780.785.691.490.383.187.188.889.181.384.690.684.675.184.588.185.877.989.791.589.683.085.189.990.381.183.190.387.583.485.193.191.083.10.094.090.3

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value2251351717422914174328121340231413342110153616101337127.7921031188.729.15226187.5641020155.5947.77624144.5837.761
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.327.025.717.218.527.622.515.513.319.314.48.69.716.912.911.210.918.715.49.415.424.915.511.914.222.110.38.510.417.014.910.19.718.916.99.712.516.614.96.99.016.90.06.09.7

us-gaap:OperatingIncomeLoss us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

cpk:Boulden, cpk:UnregulatedEnergy


Operating
Period End2020-09-302020-06-302020-03-31
Value-0.20.11.4
Percentage of OperatingIncomeLoss-1.10.63.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.20.10.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Boulden cpk:UnregulatedEnergy0.00.00.0

cpk:ElktonGas, cpk:RegulatedEnergy


Operating
Period End2021-06-302021-03-31
Value0.30.6
Percentage of OperatingIncomeLoss1.31.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.30.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:ElktonGas cpk:RegulatedEnergy0.00.0

cpk:WesternNaturalGas, cpk:UnregulatedEnergy


Operating
Period End2021-06-302021-03-31
Value0.10.2
Percentage of OperatingIncomeLoss0.40.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:WesternNaturalGas cpk:UnregulatedEnergy0.00.0

us-gaap:OperatingIncomeLoss us-gaap:StatementBusinessSegments

cpk:OtherSegmentsAndIntersegmentsEliminations


Operating
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-30
Value0.215-0.3720.016-0.310.384-0.0140.032-0.8750.054-1.5460.0110.06-0.0260.1290.1210.1040.1250.1030.1050.0970.562-0.211-0.3260.280.086-0.1250.4250.3510.1210.043-0.091
Percentage of OperatingIncomeLoss1.0-0.70.1-1.70.9-0.10.2-2.00.4-11.70.00.4-0.20.41.20.70.30.90.80.37.2-2.0-1.03.20.9-0.55.63.40.60.8-1.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.2-0.20.0-0.30.3-0.00.0-0.40.0-1.10.00.0-0.00.10.10.10.10.10.10.10.6-0.2-0.20.30.1-0.10.50.40.10.1-0.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:OtherSegmentsAndIntersegmentsEliminations-4.77.8-0.47.4-9.00.3-0.36.2-0.615.2-0.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:RegulatedEnergy


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value22322520182721171829221514262115132317131524131113229.4479.202102113108.61917137.8481014126.9437.787
Percentage of OperatingIncomeLoss101.063.773.1117.7100.266.271.8122.2107.567.677.0132.2108.066.191.3106.5100.566.478.8129.196.766.882.7108.4103.359.176.1118.1102.466.776.0117.594.265.274.7103.8100.573.783.6124.1100.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.517.218.820.218.618.316.118.914.313.111.111.310.511.211.811.911.012.412.112.114.916.612.812.914.713.07.810.010.711.311.311.89.212.312.610.012.512.212.58.69.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:RegulatedEnergy28.227.10.024.724.527.10.023.525.528.70.021.920.324.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:UnregulatedEnergy


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value-0.445199.614-3.0920.281138.623-3.168-1.348156.66-3.9330.49131.973-0.989-0.038114.577-3.080.412112.689-1.022-0.54152.88-1.972-0.043104.34-1.8030.4479.3694.311-0.709-0.4015.1542.343-1.3920.08
Percentage of OperatingIncomeLoss-2.037.027.3-17.81.632.929.1-22.1-7.734.423.0-32.73.733.98.5-6.9-0.333.321.0-30.32.632.816.6-9.4-4.140.623.2-25.3-0.434.323.7-20.74.935.323.2-9.4-3.825.715.1-24.91.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.410.07.0-3.00.39.16.5-3.4-1.06.63.3-2.80.45.71.1-0.8-0.06.23.2-2.80.48.22.6-1.1-0.69.02.4-2.2-0.05.83.5-2.10.56.73.9-0.9-0.54.32.3-1.70.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:UnregulatedEnergy-1.325.60.0-13.61.025.60.0-14.2-2.011.00.0-5.20.69.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value3196000.0227000.0764000.0833000.01732000.073000.0-864000.0344000.0-2008000.03089000.0-1726000.0730000.01155000.0-1694000.0987000.0-15000.0-786000.0420000.0151000.0139000.0583000.089000.0-369000.08000.089000.0108000.0-3207000.04000.029000.031000.02370000.055000.055000.049000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.90.10.60.81.80.0-0.70.4-1.51.4-0.90.50.8-0.70.5-0.0-0.60.20.10.10.60.1-0.40.00.10.1-2.70.00.00.01.90.10.10.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

cpk:AOCIChangesForDefinedBenefitPensionAndPostretirementPlans


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value65000.063000.0-411000.066000.066000.066000.0763000.019000.0106000.0107000.086000.095000.094000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax2.027.8-53.87.93.890.4-88.35.5-5.33.511.88.2-5.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.0-0.30.10.10.00.60.00.10.00.10.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:AOCIChangesForDefinedBenefitPensionAndPostretirementPlans0.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value3125000.0166000.01193000.0740000.01703000.07000.0-1627000.0325000.0-2114000.02982000.0-1288000.0645000.01060000.0-1788000.0632000.0-106000.0-875000.0338000.0194000.052000.0496000.00-184000.0-75000.06000.026000.0-5000.0-27000.0-1000.00
Percentage of OtherComprehensiveIncomeLossNetOfTax97.873.1156.288.898.39.6188.394.5105.396.574.688.491.8105.564.0706.7111.380.5128.537.485.10.049.9-937.56.724.10.2-675.0-3.40.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.80.10.90.71.80.0-1.20.4-1.61.3-0.60.50.8-0.70.4-0.1-0.70.20.10.00.50.0-0.2-0.10.00.0-0.0-0.0-0.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges


Other
Period End2021-06-302021-03-312020-09-30
Value6000.0-2000.027000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax0.2-0.93.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.0-0.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges0.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1456000.0385000.0225000.0-40000.0-279000.03318000.0-1101000.0-350000.0-316000.0-45000.0-411000.0-11000.0-262000.068000.0-122000.0239000.0-607000.0-277000.0-373000.0-28000.0-8000.0-34000.0296000.036000.0-171000.0133000.0-279000.0-32000.0405000.06000.0-41000.0101000.024000.0289000.059000.0-136000.0153000.0196000.0207000.0649000.027000.022000.0-11000.0102000.0-11000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.30.20.2-0.0-0.32.2-0.8-0.4-0.2-0.0-0.2-0.0-0.20.0-0.10.2-0.5-0.1-0.3-0.0-0.0-0.00.30.0-0.20.1-0.2-0.00.40.0-0.00.10.00.20.1-0.20.20.20.20.80.00.00.00.1-0.0

Regulated Operating Revenue

us-gaap:RegulatedOperatingRevenue

us-gaap:RegulatedOperatingRevenue


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value801219382731029174731039272701098769709779706789666362109775961102725555816652557263535484725352
Percentage of RegulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax72.863.468.281.675.867.469.380.556.145.546.051.951.645.748.854.956.852.755.764.665.961.063.669.467.064.464.264.861.354.858.764.358.658.060.466.866.259.861.266.762.657.90.069.965.9

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value11119113710197152131921302272011401362391801261251851411081021461049192170120911001861228694140109788312010380861461177680
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax dei:LegalEntity

cpk:Eliminations


Revenue
Period End2021-06-302021-03-312020-06-302020-03-31
Value-17.834-18.961-15.368-15.586
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-16.1-9.9-15.8-10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-16.1-9.9-15.8-10.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Eliminations100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax dei:LegalEntity, us-gaap:ProductOrService

cpk:Aspire, cpk:EnergyTransmission


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value5.578123.4494.5559.7814.2475.421135.755.85412
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.06.73.44.76.44.64.15.94.14.35.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.06.73.44.76.44.64.15.94.14.35.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Aspire cpk:EnergyTransmission100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:CentralFloridaGasDivision, cpk:EnergyDistribution


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value8.4468.9567.3097.2318.4776.717.0157.96.2826.3175.864
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.64.77.27.55.67.25.43.54.54.62.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.64.77.27.55.67.25.43.54.54.62.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:CentralFloridaGasDivision cpk:EnergyDistribution100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:Delawarenaturalgasdivision, cpk:EnergyDistribution


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value10337.24311266.9538.256277.011132
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.117.47.112.117.47.56.312.15.08.713.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.117.47.112.117.47.56.312.15.08.713.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Delawarenaturalgasdivision cpk:EnergyDistribution100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:EasternShoreGasCompany, cpk:EnergyTransmission


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1819181819171719161415
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.810.418.118.812.619.013.68.411.510.66.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.810.418.118.812.619.013.68.411.510.66.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:EasternShoreGasCompany cpk:EnergyTransmission100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:EightFlags, cpk:EnergyGeneration


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value4.1734.3293.8823.6944.3234.0274.2354.1424.0444.234.378
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.82.33.83.82.84.33.21.82.93.11.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.82.33.83.82.84.33.21.82.93.11.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:EightFlags cpk:EnergyGeneration100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:ElktonGas, cpk:EnergyDistribution


Revenue
Period End2021-06-302021-03-312020-09-30
Value1.1952.6350.623
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.40.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.40.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:ElktonGas cpk:EnergyDistribution100.0100.0100.0

cpk:FPUElectricDistribution, cpk:EnergyDistribution


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value1818291514242014231818
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.09.728.616.29.326.115.66.317.013.47.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.09.728.616.29.326.115.66.317.013.47.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:FPUElectricDistribution cpk:EnergyDistribution100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:FloridaPublicUtilitiesCompany, cpk:EnergyDistribution


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value2326191925171823171823
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.814.019.720.116.719.314.310.512.413.49.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.814.019.720.116.719.314.310.512.413.49.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:FloridaPublicUtilitiesCompany cpk:EnergyDistribution100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:MarlinGasServices, cpk:EnergyServices


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value1.9892.3521.7082.2481.3091.0591.1082.4340.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.81.21.72.30.91.10.81.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.81.21.72.30.91.10.81.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:MarlinGasServices cpk:EnergyServices100.0100.0100.0100.0100.0100.0100.0100.00.0

cpk:MarylandNaturalGas, cpk:EnergyDistribution


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value3.224102.8243.9799.1382.6343.186102.4634.00110
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.95.52.84.16.02.82.44.41.82.94.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.95.52.84.16.02.82.44.41.82.94.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:MarylandNaturalGas cpk:EnergyDistribution100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:PeninsulaPipeline, cpk:EnergyTransmission


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value6.616.4676.4335.3614.8244.4423.5653.5653.4042.9682.098
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.03.46.35.53.24.82.71.62.42.20.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.03.46.35.53.24.82.71.62.42.20.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:PeninsulaPipeline cpk:EnergyTransmission100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:Sandpiper, cpk:EnergyDistribution


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value3.8148.0713.292.8586.2923.6733.4827.0823.5614.3678.964
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.44.23.22.94.14.02.73.12.53.23.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.44.23.22.94.14.02.73.12.53.23.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Sandpiper cpk:EnergyDistribution100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax dei:LegalEntity, us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

cpk:Aspire, cpk:EnergyTransmission, cpk:UnregulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5.57812103.4494.5559.7819.3544.2475.42113115.755.85412
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.06.77.43.44.76.47.14.64.15.95.84.14.35.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.06.77.43.44.76.47.14.64.15.95.84.14.35.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Aspire cpk:EnergyTransmission cpk:UnregulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:CentralFloridaGasDivision, cpk:EnergyDistribution, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value8.4468.9567.3097.2318.4776.717.0157.96.2826.3175.864
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.64.77.27.55.67.25.43.54.54.62.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax7.64.77.27.55.67.25.43.54.54.62.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:CentralFloridaGasDivision cpk:EnergyDistribution cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:Delawarenaturalgasdivision, cpk:EnergyDistribution, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1033-14.7187.2431126-14.2736.9538.25627-25.6227.011132
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.117.4-10.77.112.117.4-10.87.56.312.1-12.75.08.713.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax9.117.4-10.77.112.117.4-10.87.56.312.1-12.75.08.713.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Delawarenaturalgasdivision cpk:EnergyDistribution cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:EasternShoreGasCompany, cpk:EnergyTransmission, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1819191818191817171917161415
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.810.414.018.118.812.614.119.013.68.48.911.510.66.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax16.810.414.018.118.812.614.119.013.68.48.911.510.66.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:EasternShoreGasCompany cpk:EnergyTransmission cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:EightFlags, cpk:EnergyGeneration, cpk:UnregulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.1734.3294.2493.8823.6944.3234.3444.0274.2354.1424.654.0444.234.378
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.82.33.13.83.82.83.34.33.21.82.32.93.11.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.82.33.13.83.82.83.34.33.21.82.32.93.11.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:EightFlags cpk:EnergyGeneration cpk:UnregulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:ElktonGas, cpk:EnergyDistribution, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-30
Value1.1952.6351.7760.623
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.41.30.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.11.41.30.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:ElktonGas cpk:EnergyDistribution cpk:RegulatedEnergy100.0100.0100.0100.0

cpk:FPUElectricDistribution, cpk:EnergyDistribution, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value1818172915141824201418231818
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.09.713.128.616.29.313.926.115.66.39.417.013.47.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax17.09.713.128.616.29.313.926.115.66.39.417.013.47.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:FPUElectricDistribution cpk:EnergyDistribution cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:FloridaPropane, cpk:PropaneDelivery, cpk:UnregulatedEnergy


Revenue
Period End2021-06-302021-03-312020-06-302020-03-312018-12-312018-09-302018-06-302018-03-31
Value235517385.5414.1664.9426.634
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.828.917.825.32.83.03.62.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.828.917.825.32.83.03.62.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:FloridaPropane cpk:PropaneDelivery cpk:UnregulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0

cpk:FloridaPublicUtilitiesCompany, cpk:EnergyDistribution, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2326251919252217182322171823
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.814.018.419.720.116.716.719.314.310.511.112.413.49.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.814.018.419.720.116.716.719.314.310.511.112.413.49.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:FloridaPublicUtilitiesCompany cpk:EnergyDistribution cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:MarlinGasServices, cpk:EnergyServices, cpk:UnregulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value1.9892.3522.5521.7082.2481.3091.1011.0591.1082.4340.1210.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.81.21.91.72.30.90.81.10.81.10.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.81.21.91.72.30.90.81.10.81.10.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:MarlinGasServices cpk:EnergyServices cpk:UnregulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

cpk:MarylandNaturalGas, cpk:EnergyDistribution, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.224105.9122.8243.9799.1386.652.6343.186107.0362.4634.00110
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.95.54.32.84.16.05.02.82.44.43.51.82.94.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax2.95.54.32.84.16.05.02.82.44.43.51.82.94.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:MarylandNaturalGas cpk:EnergyDistribution cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:PeninsulaPipeline, cpk:EnergyTransmission, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value6.616.4676.4626.4335.3614.8244.884.4423.5653.5653.4583.4042.9682.098
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.03.44.76.35.53.23.74.82.71.61.72.42.20.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax6.03.44.76.35.53.23.74.82.71.61.72.42.20.9
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:PeninsulaPipeline cpk:EnergyTransmission cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:Sandpiper, cpk:EnergyDistribution, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3.8148.0714.7743.292.8586.2924.8313.6733.4827.0825.1963.5614.3678.964
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.44.23.53.22.94.13.74.02.73.12.62.53.23.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.44.23.53.22.94.13.74.02.73.12.62.53.23.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Sandpiper cpk:EnergyDistribution cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax dei:LegalEntity, us-gaap:StatementBusinessSegments

cpk:Eliminations, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-13.168-14.101-12.335-11.145-11.285-10.734-9.487-8.968-9.745-8.392-7.359-10.176-7.828
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-11.9-7.4-12.2-11.5-7.4-8.1-10.2-6.9-4.3-4.2-5.2-7.4-3.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-11.9-7.4-12.2-11.5-7.4-8.1-10.2-6.9-4.3-4.2-5.2-7.4-3.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Eliminations cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:Other, cpk:UnregulatedEnergy


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-0.065-0.091-0.035-0.0160.316-0.859-2.158-5.091-2.709-2.743-4.751
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.0-0.0-0.00.2-0.9-1.6-2.2-1.9-2.0-2.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.0-0.0-0.00.2-0.9-1.6-2.2-1.9-2.0-2.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Other cpk:UnregulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService

cpk:Eliminations


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-17.967-19.093-18.143-16.558-15.501-15.719-16.493-15.108-21.132-29.477-27.618-19.212-23.803-28.671
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-16.2-10.0-13.2-16.3-16.0-10.3-12.5-16.3-16.1-13.0-13.7-13.7-17.4-12.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-16.2-10.0-13.2-16.3-16.0-10.3-12.5-16.3-16.1-13.0-13.7-13.7-17.4-12.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Eliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:EnergyDistribution


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value68108706190626190606399
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax61.956.969.362.959.067.046.639.943.246.341.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax61.956.969.362.959.067.046.639.943.246.341.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:EnergyDistribution100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:EnergyTransmission


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3039352828333226263633252329
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.820.626.127.929.022.224.828.420.415.916.518.117.112.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.820.626.127.929.022.224.828.420.415.916.518.117.112.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:EnergyTransmission100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:Other


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.1330.1320.1320.1310.1320.4740.5120.5290.6020.5370.6140.6110.6990.688
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.30.40.60.50.20.30.40.50.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.30.40.60.50.20.30.40.50.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Other100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:PropaneDelivery


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value235513173813174633172052
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.828.913.517.825.114.913.020.316.912.414.821.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax20.828.913.517.825.114.913.020.316.912.414.821.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:PropaneDelivery100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementBusinessSegments

cpk:Eliminations, cpk:Eliminations


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-4.734-4.901-4.188-4.34-4.409-4.367-9.536-14.236-8.668-10.379-15.598
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.3-2.6-4.1-4.5-2.9-4.7-7.3-6.3-6.2-7.6-6.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.3-2.6-4.1-4.5-2.9-4.7-7.3-6.3-6.2-7.6-6.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Eliminations cpk:Eliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:Eliminations, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-13.168-14.101-12.335-11.145-11.285-10.734-9.487-8.968-9.745-8.392-7.359-10.176-7.828
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-11.9-7.4-12.2-11.5-7.4-8.1-10.2-6.9-4.3-4.2-5.2-7.4-3.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-11.9-7.4-12.2-11.5-7.4-8.1-10.2-6.9-4.3-4.2-5.2-7.4-3.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Eliminations cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:Eliminations, cpk:UnregulatedEnergy


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-0.065-0.091-0.035-0.016-0.025-1.03-1.254-2.628-5.496-4.807-3.185-3.248-5.245
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.0-0.0-0.0-0.0-0.8-1.4-2.0-2.4-2.4-2.3-2.4-2.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.1-0.0-0.0-0.0-0.0-0.8-1.4-2.0-2.4-2.4-2.3-2.4-2.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Eliminations cpk:UnregulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:EnergyDistribution, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value68108817061907862619079606399
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax61.956.959.369.362.959.059.667.046.639.939.643.246.341.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax61.956.959.369.362.959.059.667.046.639.939.643.246.341.6
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:EnergyDistribution cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:EnergyTransmission, cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value2526252423242322212221191717
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.813.918.724.524.415.817.823.816.39.910.614.012.87.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax22.813.918.724.524.415.817.823.816.39.910.614.012.87.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:EnergyTransmission cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:EnergyTransmission, cpk:UnregulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value5.57812103.4494.5559.7819.3544.2475.42113115.755.85412
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.06.77.43.44.76.47.14.64.15.95.84.14.35.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax5.06.77.43.44.76.47.14.64.15.95.84.14.35.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:EnergyTransmission cpk:UnregulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:Other, cpk:Other


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.1330.1320.1310.1320.1330.1340.1320.1320.1350.1940.194
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.10.10.10.10.10.1
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Other cpk:Other100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:PropaneDelivery, cpk:UnregulatedEnergy


Revenue
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value13173813174633172052
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.517.825.114.913.020.316.912.414.821.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax13.517.825.114.913.020.316.912.414.821.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:PropaneDelivery cpk:UnregulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:StatementBusinessSegments

cpk:Other


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-4.601-4.769-4.057-4.208-4.276-4.596-4.233-9.404-14.104-14.287-8.533-10.185-15.404
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.1-2.5-4.0-4.3-2.8-3.5-4.6-7.2-6.2-7.1-6.1-7.5-6.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.1-2.5-4.0-4.3-2.8-3.5-4.6-7.2-6.2-7.1-6.1-7.5-6.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Other100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:OtherSegmentsAndIntersegmentsEliminations


Revenue
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-4.601-4.769-4.057-4.208-4.276-4.596-4.233-9.404-14.104-14.287-8.533-10.185-15.404
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.1-2.5-4.0-4.3-2.8-3.5-4.6-7.2-6.2-7.1-6.1-7.5-6.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-4.1-2.5-4.0-4.3-2.8-3.5-4.6-7.2-6.2-7.1-6.1-7.5-6.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:OtherSegmentsAndIntersegmentsEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:RegulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value80121938273102917473103927270109
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax72.863.468.281.675.867.469.380.556.145.546.051.951.645.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax72.863.468.281.675.867.469.380.556.145.546.051.951.645.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:UnregulatedEnergy


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value3474482227544522661381227676145
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.339.135.122.428.635.434.224.151.160.761.154.255.960.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax31.339.135.122.428.635.434.224.151.160.761.154.255.960.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:UnregulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:ConsolidationEliminations


Revenue
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value-16.427-15.369-15.245-15.981-14.579-20.53-28.94-48.783-13.861-23.104-27.983
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-16.2-15.8-10.0-12.1-15.7-15.7-12.7-24.2-9.9-16.9-11.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-16.2-15.8-10.0-12.1-15.7-15.7-12.7-24.2-9.9-16.9-11.7
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax srt:ConsolidationEliminations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value11119113710197152131921302272011401362391801261251851411081021461049192170120911001861228694140109788312010380861461177680
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Revenues dei:LegalEntity, us-gaap:StatementBusinessSegments

cpk:Other, cpk:RegulatedEnergy


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.1-0.30.40.20.10.70.00.1-0.30.1210.6350.546-0.356-0.589
Percentage of Revenues0.1-0.20.30.20.10.50.00.1-0.20.10.30.4-0.3-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.1-0.20.30.20.10.50.00.1-0.20.10.30.4-0.3-0.2
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Other cpk:RegulatedEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:Other, cpk:UnregulatedEnergy


Revenuesdei:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.090.10.00.050.040.10.00.10.10.0840.0880.0910.0820.073
Percentage of Revenues0.10.10.00.00.00.10.00.10.10.00.00.10.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.00.00.00.10.00.10.10.00.00.10.10.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Other cpk:UnregulatedEnergy-138.5-109.90.0-142.9-250.031.60.0-11.6-4.6-1.60.0-3.4-3.0-1.5

us-gaap:Revenues us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

cpk:Boulden, cpk:UnregulatedEnergy


Revenuesus-gaap:
Period End2020-09-302020-06-302020-03-31
Value0.40.82.8
Percentage of Revenues0.40.81.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.40.81.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:Boulden cpk:UnregulatedEnergy0.00.00.0

cpk:ElktonGas, cpk:RegulatedEnergy


Revenuesus-gaap:
Period End2021-06-302021-03-31
Value0.52.6
Percentage of Revenues0.51.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.51.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:ElktonGas cpk:RegulatedEnergy0.00.0

cpk:WesternNaturalGas, cpk:UnregulatedEnergy


Revenuesus-gaap:
Period End2021-06-302021-03-31
Value0.60.8
Percentage of Revenues0.50.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax cpk:WesternNaturalGas cpk:UnregulatedEnergy0.00.0

us-gaap:Revenues us-gaap:ConsolidationItems

us-gaap:IntersegmentElimination


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value4.7344.9014.6654.1884.344.4084.7294.3679.53614148.6681015117.6499.125.4474.7763.9532.0970.6611.061.7122.1560.7180.710.5580.5680.6441.5932.7262.220.5061.2091.946
Percentage of Revenues4.32.63.44.14.52.93.64.77.36.37.26.27.66.56.66.07.32.93.43.62.00.51.01.92.30.40.60.60.60.31.33.12.40.41.12.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax4.32.63.44.14.52.93.64.77.36.37.26.27.66.56.66.07.32.93.43.62.00.51.01.92.30.40.60.60.60.31.33.12.40.41.12.5
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value1111911371019715213192130227201140136239180126125185141108102146104919217012091100186122869414010978
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:Revenues us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IntersegmentElimination, cpk:RegulatedEnergy


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value0.5360.4760.4680.4650.4750.4610.5260.5532.6842.8790.0543.0732.7733.4393.5052.4462.1811.2081.0391.120.8050.3220.3980.270.270.290.2370.270.2980.2920.2670.2930.2410.2630.260.328
Percentage of Revenues0.50.20.30.50.50.30.40.62.11.30.02.22.01.41.91.91.70.70.71.00.80.20.40.30.30.20.20.30.30.20.20.30.30.20.20.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.50.20.30.50.50.30.40.62.11.30.02.22.01.41.91.91.70.70.71.00.80.20.40.30.30.20.20.30.30.20.20.30.30.20.20.4
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination cpk:RegulatedEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IntersegmentElimination, cpk:UnregulatedEnergy


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value4.0654.2934.0653.5923.7333.8154.0713.6826.7211-0.8545.467.412118.1825.0096.784.0113.5622.5931.0520.1130.4421.2221.6660.2070.2540.030.0220.0991.0522.1591.7520.00.7071.398
Percentage of Revenues3.72.23.03.53.82.53.14.05.14.9-0.43.95.45.04.53.95.42.22.52.41.00.10.41.31.80.10.20.00.00.10.92.51.90.00.61.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax3.72.23.03.53.82.53.14.05.14.9-0.43.95.45.04.53.95.42.22.52.41.00.10.41.31.80.10.20.00.00.10.92.51.90.00.61.8
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination cpk:UnregulatedEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:IntersegmentElimination, us-gaap:AllOtherSegments


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value0.1330.1320.1320.1310.1320.1320.1320.1320.1320.1320.2530.1350.1940.1940.1930.1940.1590.2280.1750.240.240.2260.220.220.220.2210.2190.2580.2480.2530.2740.2740.2270.2430.2420.22
Percentage of Revenues0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.10.10.10.20.20.20.20.20.20.10.20.30.20.10.20.30.20.20.20.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.20.10.10.10.20.20.20.20.20.20.10.20.30.20.10.20.30.20.20.20.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:IntersegmentElimination us-gaap:AllOtherSegments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cpk:RegulatedEnergy


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value801209382731029074701008969671058467689678686688666361109775961101715554816551
Percentage of Revenues72.463.167.981.175.367.168.979.954.044.344.449.749.644.346.853.055.052.155.063.665.160.863.269.166.764.364.064.561.054.758.564.058.457.860.266.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax72.463.167.981.175.367.168.979.954.044.344.449.749.644.346.853.055.052.155.063.665.160.863.269.166.764.364.064.561.054.758.564.058.457.860.266.3
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cpk:RegulatedEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OperatingSegments, cpk:UnregulatedEnergy


Revenuesus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value307043192450411860126111706813395595688633935573828306043273479462634543921
Percentage of Revenues27.636.932.118.924.732.931.120.146.055.755.650.350.455.753.247.045.047.945.036.434.939.236.830.933.335.736.029.534.142.937.830.236.439.135.628.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.636.932.118.924.732.931.120.146.055.755.650.350.455.753.247.045.047.945.036.434.939.236.830.933.335.736.029.534.142.937.830.236.439.135.628.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:OperatingSegments cpk:UnregulatedEnergy0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Unregulated Operating Revenue

us-gaap:UnregulatedOperatingRevenue

us-gaap:UnregulatedOperatingRevenue


Unregulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value3069601823495818571231566766129125575487733834574228306043273479472836543923254437232958422024
Percentage of UnregulatedOperatingRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax27.236.644.218.424.232.644.019.543.954.578.048.148.454.369.745.143.247.351.835.434.139.041.030.633.035.636.229.534.242.938.632.738.339.136.329.830.037.136.029.434.240.136.326.330.7

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value197219531932188818221788178317141681168216931505146214271417134612561238122911401097108110681008970913904847821842837797779738733699679693709657660670
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems

cpk:CorporateAndEliminations


Assetsus-gaap:
Period End2020-12-312019-12-31
Value3752
Percentage of Assets1.92.9
Percentage of Assets1.92.9
Percentage of Assets cpk:CorporateAndEliminations100.0100.0

us-gaap:Assets us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, cpk:RegulatedEnergy


Assetsus-gaap:
Period End2020-12-312019-12-31
Value15471434
Percentage of Assets80.180.4
Percentage of Assets80.180.4
Percentage of Assets us-gaap:OperatingSegments cpk:RegulatedEnergy100.0100.0

us-gaap:OperatingSegments, cpk:UnregulatedEnergy


Assetsus-gaap:
Period End2020-12-312019-12-31
Value347296
Percentage of Assets18.016.6
Percentage of Assets18.016.6
Percentage of Assets us-gaap:OperatingSegments cpk:UnregulatedEnergy100.0100.0

us-gaap:Assets us-gaap:StatementBusinessSegments

cpk:RegulatedEnergy


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value156815591547153014771448143413841349134313451223119911481121108410251000986921892879870824800788796744716715708658621615593572565
Percentage of Assets79.579.880.181.181.181.080.480.780.379.879.581.382.080.579.180.681.680.880.380.881.481.381.581.782.586.388.087.887.284.984.684.484.283.984.884.279.8
Percentage of Assets79.579.880.181.181.181.080.480.780.379.879.581.382.080.579.180.681.680.880.380.881.481.381.581.782.586.388.087.887.284.984.684.484.283.984.884.279.8
Percentage of Assets cpk:RegulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:UnregulatedEnergy


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value359352347305296295296250284296306244227246261233202213226207192178172156147898475771031009283796870107
Percentage of Assets18.318.018.016.216.316.516.614.616.917.618.116.215.517.218.517.416.117.218.418.217.616.516.215.615.29.89.49.09.512.312.011.911.310.89.810.315.2
Percentage of Assets18.318.018.016.216.316.516.614.616.917.618.116.215.517.218.517.416.117.218.418.217.616.516.215.615.29.89.49.09.512.312.011.911.310.89.810.315.2
Percentage of Assets cpk:UnregulatedEnergy100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllOtherSegments


Assetsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value44423751484452514642413736323428282416111123252722352327272327283339373735
Percentage of Assets2.22.21.92.72.72.52.93.02.82.52.52.52.52.32.42.12.32.01.31.01.12.22.42.72.43.82.63.23.32.83.33.74.55.35.45.55.0
Percentage of Assets2.22.21.92.72.72.52.93.02.82.52.52.52.52.32.42.12.32.01.31.01.12.22.42.72.43.82.63.23.32.83.33.74.55.35.45.55.0
Percentage of Assets us-gaap:AllOtherSegments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SegmentContinuingOperations


Assetsus-gaap:
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302018-12-31
Value188818221788178316851633
Percentage of Assets100.0100.0100.0100.098.396.4
Percentage of Assets100.0100.0100.0100.098.396.4
Percentage of Assets us-gaap:SegmentContinuingOperations100.0100.0100.0100.0100.0100.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value197219531932188818221788178317141681168216931505146214271417134612561238122911401097108110681008970913904847821842837797779738733699679693709657660670
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value741726697616593584561544544543518508507505486463461460446438379374358353351317300296296293278269269267256250250248240237238226209123
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.637.236.132.732.632.731.531.832.432.330.633.834.735.434.334.436.737.236.338.434.634.633.535.036.234.833.235.036.134.833.333.834.536.335.035.836.835.834.036.136.033.70.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value0.558-2.638-2.865-3.629-4.462-6.194-6.267-5.403-5.747-3.739-6.713-4.987-5.718-6.873-4.272-5.259-5.244-4.458-4.878-5.029-5.168-5.751-5.84-5.471-5.479-5.568-5.676-2.469-2.473-2.502-2.533-4.903-4.958-5.013-5.062-4.327-4.394-4.46-4.527-2.817-2.999-3.36-2.524-3.748
Percentage of StockholdersEquity0.1-0.4-0.4-0.6-0.8-1.1-1.1-1.0-1.1-0.7-1.3-1.0-1.1-1.4-0.9-1.1-1.1-1.0-1.1-1.1-1.4-1.5-1.6-1.5-1.6-1.8-1.9-0.8-0.8-0.9-0.9-1.8-1.8-1.9-2.0-1.7-1.8-1.8-1.9-1.2-1.3-1.5-1.2-3.0
Percentage of Assets0.0-0.1-0.1-0.2-0.2-0.3-0.4-0.3-0.3-0.2-0.4-0.3-0.4-0.5-0.3-0.4-0.4-0.4-0.4-0.4-0.5-0.5-0.5-0.5-0.6-0.6-0.6-0.3-0.3-0.3-0.3-0.6-0.6-0.7-0.7-0.6-0.6-0.6-0.6-0.4-0.5-0.50.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value35735034828326325925925725625525525525525425325225225125025019119019018918715615615515415215215115115015015014914914914914814814466
Percentage of StockholdersEquity48.248.350.046.044.444.446.247.347.147.049.350.350.350.352.154.554.654.556.357.150.550.953.153.653.549.352.152.552.252.154.656.256.256.258.760.059.960.162.062.862.565.568.954.2
Percentage of Assets18.118.018.015.014.414.514.515.015.315.215.117.017.517.817.918.820.120.320.421.917.517.617.818.819.417.217.318.318.818.118.219.019.420.420.521.522.121.521.122.722.522.10.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value8.558.5288.4998.1268.0137.9987.9847.9847.9847.987.9717.9717.9717.9647.9557.9557.9557.9497.9357.9327.4567.4497.4327.4297.1197.17.0954.7274.7154.6914.6854.6844.6794.6714.6694.6684.6614.6564.6554.6544.6354.5723.323
Percentage of StockholdersEquity1.21.21.21.31.41.41.41.51.51.51.51.61.61.61.61.71.71.71.81.82.02.02.12.12.22.42.41.61.61.71.71.71.71.81.91.91.91.92.02.02.02.22.7
Percentage of Assets0.40.40.40.40.40.40.40.50.50.50.50.50.50.60.60.60.60.60.60.70.70.70.70.70.80.80.80.60.60.60.60.60.60.60.70.70.70.70.70.70.70.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DeferredCompensationShareBasedPayments


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value7.2036.9925.6795.6345.6595.4684.5434.5054.6944.3763.8543.8183.7823.5733.3953.3663.3363.12.4162.4762.4522.2211.8831.8631.8431.7151.2581.2171.2021.1381.1241.111.0960.9940.9820.970.9580.8280.8170.8070.7960.7770.7391.549
Percentage of StockholdersEquity1.01.00.80.91.00.90.80.80.90.80.70.80.70.70.70.70.70.70.50.60.60.60.50.50.50.50.40.40.40.40.40.40.40.40.40.40.40.30.30.30.30.30.41.3
Percentage of Assets0.40.40.30.30.30.30.30.30.30.30.20.30.30.30.20.20.30.30.20.20.20.20.20.20.20.20.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.0
Percentage of Assets us-gaap:DeferredCompensationShareBasedPayments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value3743693423283263223002842852842612492502502292082062061921851851821661621611591421361391381241181181171069910098918687766356
Percentage of StockholdersEquity50.650.949.253.255.055.353.552.352.552.350.449.149.349.547.144.944.844.743.142.348.948.746.445.945.950.247.446.047.047.144.643.943.943.941.439.940.039.837.936.536.833.930.146.2
Percentage of Assets19.018.917.717.417.918.116.916.617.016.915.416.617.117.516.215.516.516.715.616.216.916.815.616.116.617.515.716.117.016.414.814.815.215.914.514.314.714.212.913.213.311.40.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value-7.203-6.992-5.679-5.634-5.659-5.468-4.543-4.505-4.694-4.376-3.854-3.818-3.782-3.573-3.395-3.366-3.336-3.1-2.416-2.476-2.452-2.221-1.883-1.863-1.843-1.715-1.258-1.217-1.202-1.138-1.124-1.11-1.096-0.994-0.982-0.97-0.958-0.828-0.817-0.807-0.796-0.777-0.739-1.549
Percentage of StockholdersEquity-1.0-1.0-0.8-0.9-1.0-0.9-0.8-0.8-0.9-0.8-0.7-0.8-0.7-0.7-0.7-0.7-0.7-0.7-0.5-0.6-0.6-0.6-0.5-0.5-0.5-0.5-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.4-1.3
Percentage of Assets-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.3-0.3-0.3-0.2-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.10.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value1101281361199811113411412415319112811613717814910211814110286100112877811312288801191269795931008678103127111120137
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.66.67.16.35.46.37.66.77.49.111.38.67.99.712.611.18.19.611.59.07.99.310.58.78.112.413.510.49.814.215.112.312.312.713.712.411.614.918.016.918.220.5

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302009-12-312008-12-31
Value5.0115.5753.4993.0563.593.9826.9854.327.2547.9756.0896.2154.5125.9965.6143.3862.4195.74.1781.5363.2663.3152.8553.7812.104164.5742.2852.5294.7913.3561.7922.212.6083.3612.0461.7372.0472.6371.771.8281.9841.6432.7439.2562.8281.611
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.20.20.20.20.40.30.40.50.40.40.30.40.40.30.20.50.30.10.30.30.30.40.21.80.50.30.30.60.40.20.30.40.50.30.30.30.40.30.30.00.20.00.00.00.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-12-31
Value5011000.05575000.03499000.03056000.03590000.03982000.06985000.04320000.07254000.07975000.06089000.05614000.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.30.30.20.20.20.20.40.30.40.50.40.4

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value415856494645493448748552536977524158624741444139426253434480756066625342416876658088
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.13.02.92.62.62.52.82.02.94.45.03.53.74.95.43.93.34.75.14.13.84.13.84.04.46.85.95.15.59.59.07.68.68.57.36.06.110.010.810.012.213.1

Other Assets Current

us-gaap:OtherAssetsCurrent

us-gaap:OtherAssetsCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value523000.0635000.0436000.0753000.01017000.03666000.02879000.02489000.04022000.01121000.05684000.02557000.04560000.06717000.07260000.04797000.02287000.01804000.02470000.0543000.0771000.01688000.01044000.0339000.0285000.0294000.0195000.0201000.0203000.0198000.0160000.0160000.0165000.0146000.0132000.0121000.0155000.0219000.0219000.0212000.0226000.0245000.0
Percentage of OtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.10.20.20.10.20.10.30.20.30.50.50.40.20.10.20.00.10.20.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Property Plant And Equipment Gross

us-gaap:PropertyPlantAndEquipmentGross

us-gaap:PropertyPlantAndEquipmentGross


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value19871936190818731816176117461688165616171569149814201324131212831267120611751124107610161007973953883870833810795788730716683675637630622616601592578
Percentage of PropertyPlantAndEquipmentGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.899.198.899.299.798.597.998.598.696.192.799.597.192.892.695.3100.897.495.698.698.194.094.396.698.296.796.298.398.794.494.291.691.992.592.191.092.889.886.991.589.786.3

us-gaap:PropertyPlantAndEquipmentGross us-gaap:PublicUtility

cpk:OtherPropertyPlantAndEquipment


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value30403427211818212019
Percentage of PropertyPlantAndEquipmentGross1.62.32.22.11.81.92.12.73.03.2
Percentage of Assets1.62.22.02.01.71.82.02.52.72.8
Percentage of Assets cpk:OtherPropertyPlantAndEquipment0.00.00.00.00.00.00.00.00.00.0

us-gaap:PropertyPlantAndEquipmentGross us-gaap:StatementGeographical, us-gaap:PublicUtility

cpk:DelmarvaPeninsulaPennsylvaniaandFlorida, cpk:NaturalGasTransmission


Property
Period End2020-12-312019-12-312018-12-312017-12-31
Value667608537384
Percentage of PropertyPlantAndEquipmentGross35.034.934.329.3
Percentage of Assets34.534.131.727.1
Percentage of Assets cpk:DelmarvaPeninsulaPennsylvaniaandFlorida cpk:NaturalGasTransmission0.00.00.00.0

cpk:DelmarvaandFlorida, cpk:NaturalGasDistribution


Property
Period End2020-12-312019-12-312018-12-312017-12-31
Value782705657589
Percentage of PropertyPlantAndEquipmentGross41.040.441.944.9
Percentage of Assets40.539.538.841.6
Percentage of Assets cpk:DelmarvaandFlorida cpk:NaturalGasDistribution0.00.00.00.0

cpk:MidAtlanticandFlorida, cpk:PropaneOperations


Property
Period End2020-12-312019-12-312018-12-312017-12-31
Value151141123108
Percentage of PropertyPlantAndEquipmentGross7.98.17.98.2
Percentage of Assets7.88.07.37.6
Percentage of Assets cpk:MidAtlanticandFlorida cpk:PropaneOperations0.00.00.00.0

stpr:FL, cpk:ElectricityandSteamGeneration


Property
Period End2020-12-312019-12-312018-12-312017-12-31
Value36353535
Percentage of PropertyPlantAndEquipmentGross1.92.02.22.7
Percentage of Assets1.92.02.12.5
Percentage of Assets stpr:FL cpk:ElectricityandSteamGeneration0.00.00.00.0

stpr:FL, cpk:MobileCNGUtilityandPipelineSolutions


Property
Period End2020-12-312019-12-312018-12-312017-12-31
Value24147.240.0
Percentage of PropertyPlantAndEquipmentGross1.30.80.50.0
Percentage of Assets1.30.80.40.0
Percentage of Assets stpr:FL cpk:MobileCNGUtilityandPipelineSolutions0.00.00.00.0

stpr:FL, us-gaap:ElectricDistribution


Property
Period End2020-12-312019-12-312018-12-312017-12-31
Value127127102100
Percentage of PropertyPlantAndEquipmentGross6.77.36.57.6
Percentage of Assets6.67.26.07.1
Percentage of Assets stpr:FL us-gaap:ElectricDistribution0.00.00.00.0

stpr:OH, cpk:NaturalGasTransmission


Property
Period End2020-12-312019-12-312018-12-312017-12-31
Value87737066
Percentage of PropertyPlantAndEquipmentGross4.64.24.55.0
Percentage of Assets4.64.14.14.7
Percentage of Assets stpr:OH cpk:NaturalGasTransmission0.00.00.00.0

Accumulated Depreciation Depletion And Amortization Property Plant And Equipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value393380368358357345336330321312294295287279270267260250245237229222215210205198193192186179174171165160155150146141137133129121
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets19.919.519.119.019.619.318.919.319.118.617.419.619.719.619.119.820.720.219.920.820.920.620.120.921.121.721.422.722.721.420.821.421.221.721.221.621.520.419.420.319.518.1

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value167216351601156715251491146314601421139513831263123411761126108510511018986936908881854819790709689679660643631609593552541523509497487478471462
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets84.883.782.983.083.783.482.185.284.582.981.783.984.482.479.480.683.682.280.382.182.881.480.081.281.477.676.380.280.576.375.476.576.174.873.874.775.071.868.872.871.469.0

us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentByType

cpk:JointlyOwnedPipeline


Property
Period End2020-12-31
Value26
Percentage of PropertyPlantAndEquipmentNet1.6
Percentage of Assets1.4
Percentage of Assets cpk:JointlyOwnedPipeline0.0

cpk:NaturalGasOperations


Property
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-31
Value6.76.76.676.676.676.76.76.76.7
Percentage of PropertyPlantAndEquipmentNet0.40.50.50.60.70.81.01.11.2
Percentage of Assets0.30.40.40.50.50.60.70.80.9
Percentage of Assets cpk:NaturalGasOperations0.00.00.00.00.00.00.00.00.0

Goodwill

us-gaap:Goodwill

us-gaap:Goodwill


Goodwill
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312012-01-312011-12-312011-09-302011-06-302010-12-31
Value383838363232322125252519192222211515151515151416164.9524.9524.6254.6254.6254.3544.7164.7164.5434.094.094.094.090.24.09353535
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.02.02.02.01.81.81.81.31.51.51.51.31.31.51.61.61.21.21.21.31.41.41.41.61.70.50.50.50.60.50.50.60.60.60.60.60.60.60.00.65.45.45.3

us-gaap:Goodwill us-gaap:StatementBusinessSegments

cpk:RegulatedEnergy


Goodwillus-gaap:
Period End2020-12-312019-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value7.6173.3533.3533.3533.3533.3542.793.2163.216
Percentage of Goodwill19.710.315.222.223.067.764.178.678.6
Percentage of Assets0.40.20.20.30.30.40.30.40.5
Percentage of Assets cpk:RegulatedEnergy0.50.20.30.30.40.40.40.50.6

cpk:UnregulatedEnergy


Goodwillus-gaap:
Period End2020-12-312019-12-312017-12-312016-12-312015-12-312014-12-312013-12-312013-02-052012-12-312011-12-31
Value31291811111.5981.5641.60.8740.874
Percentage of Goodwill80.389.784.877.877.032.335.90.021.421.4
Percentage of Assets1.61.61.31.01.00.20.20.00.10.1
Percentage of Assets cpk:UnregulatedEnergy8.99.97.25.26.51.91.60.01.10.8

Intangible Assets Net Excluding Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill


Intangible
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7625000.07958000.08292000.07215000.07520000.07824000.08129000.03272000.05611000.05909000.06207000.04073000.04277000.04482000.04686000.04608000.01664000.01752000.01843000.01938000.02033000.02128000.02222000.02317000.02415000.02316000.02404000.02675000.02775000.02875000.02975000.03075000.03175000.03017000.02798000.02879000.02961000.03044000.03127000.03210000.03293000.03459000.0
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.40.40.50.20.30.40.40.30.30.30.30.30.10.10.10.20.20.20.20.20.20.30.30.30.30.30.40.40.40.40.40.40.40.40.40.50.50.5

Deferred Tax Assets Liabilities Net

us-gaap:DeferredTaxAssetsLiabilitiesNet

us-gaap:DeferredTaxAssetsLiabilitiesNet


Deferred
Period End2020-12-312019-12-312014-12-312013-12-312012-12-312011-12-31
Value205180-161.064-140.901124112
Percentage of DeferredTaxAssetsLiabilitiesNet100.0100.0100.0100.0100.0100.0
Percentage of Assets10.610.1-17.8-16.817.015.9

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value101011111111111212
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.50.50.60.60.60.70.60.70.7

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4958604646525453507512960605774535249564135363941384644333058534145384135374855386465
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.53.03.12.52.52.93.03.13.04.57.74.04.24.05.34.04.14.04.63.63.23.43.74.13.95.14.93.93.76.96.45.15.95.35.75.15.47.07.85.99.89.8

Contract With Customer Liability Current

us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:ContractWithCustomerLiabilityCurrent


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value342000.0433000.0644000.0971000.0347000.0428000.0589000.0774000.0316000.0305000.0480000.0583000.0175000.0244000.0407000.0
Percentage of ContractWithCustomerLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.10.00.00.00.00.00.00.00.00.00.00.0

Dividends Payable Current

us-gaap:DividendsPayableCurrent

us-gaap:DividendsPayableCurrent


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value8433000.07709000.07683000.07293000.07244000.06655000.06644000.06644000.06644000.06067000.06060000.06060000.06060000.05318000.05312000.05312000.05312000.04981000.04973000.04678000.04673000.04400000.04390000.04388000.04382000.03950000.03939000.03936000.03933000.03730000.03710000.03706000.03706000.03504000.03502000.03501000.03501000.03304000.03300000.03300000.03299000.03143000.0
Percentage of DividendsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.40.50.40.40.50.50.40.40.50.50.50.50.50.50.50.50.50.50.5

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value322316329359429402423446512508528427388374413339272320334263283274279236199186194169140213221195181153162130112129157134136197
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.316.217.019.123.622.523.726.030.530.231.228.426.626.229.125.221.625.927.223.125.925.426.223.520.620.421.519.917.125.326.524.523.320.822.118.716.518.722.220.520.729.5

Long Term Debt Current

us-gaap:LongTermDebtCurrent

us-gaap:LongTermDebtCurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value13131315151545757571119.6139.9779.3899.4211212121212129.1639.1519.1399.1279.1169.109111110118.2347.9969.0938.1968.1968.1968.1968.1969.1969.1969.216
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.70.70.80.90.92.64.44.54.20.70.60.70.70.70.91.01.01.01.11.10.80.90.90.91.01.01.31.41.31.41.01.01.21.11.21.21.21.21.41.41.4

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1732000.01724000.01747000.01733000.01647000.01608000.01705000.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.10.10.10.10.1

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value191415182016121516141214118.6941013129.2787.063108.9787.9427.0599.4438.7567.7976.603109.9788.9347.678109.1268.6437.226109.0528.3818.079111210
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.00.70.81.01.10.90.70.91.00.90.81.00.80.60.71.01.00.70.60.90.80.70.70.90.90.90.71.31.21.10.91.31.21.21.01.41.31.21.11.81.81.5

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value512523523536446456486452352357327250250230205211211145145151151153153159159161161169169121122108110110116116118
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.026.827.128.424.525.527.326.420.921.219.316.717.116.114.515.716.811.811.913.313.814.214.415.916.517.717.920.020.714.414.613.914.915.016.717.216.7

us-gaap:LongTermDebt us-gaap:CreditFacility

cpk:AggregateShelfAgreements


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-05-052020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value360360360360270270270270270170170170
Percentage of LongTermDebt70.268.868.867.160.50.059.155.559.748.347.652.0
Percentage of Assets18.318.418.619.114.80.015.115.115.810.110.110.0
Percentage of Assets cpk:AggregateShelfAgreements0.00.00.00.00.00.00.00.00.00.00.00.0

cpk:NewYorkLife


Long
Period End2020-12-312019-12-31
Value140100
Percentage of LongTermDebt26.820.6
Percentage of Assets7.25.6
Percentage of Assets cpk:NewYorkLife0.00.0

cpk:Prudential


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value220220220220170170170170707070
Percentage of LongTermDebt42.942.142.141.038.137.234.937.619.919.621.4
Percentage of Assets11.211.311.411.79.39.59.59.94.24.24.1
Percentage of Assets cpk:Prudential0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongTermDebt us-gaap:DebtInstrument

cpk:FirstMortgageBondDueOnTwoThousandTwentyTwo


Long
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value7.9937.9927.9917.997.9897.9887.9877.9867.9857.9847.9837.9827.9817.987.9797.9787.9767.9767.9757.9737.9737.9717.9717.9697.9697.9687.9677.9677.9667.9647.9637.9627.9617.967.958
Percentage of LongTermDebt1.51.81.81.61.82.32.22.43.23.23.53.93.83.85.55.55.35.35.25.25.05.04.94.94.74.76.66.50.07.37.27.26.86.86.7
Percentage of Assets0.40.40.40.40.50.50.50.50.50.50.60.60.60.60.60.60.70.70.70.70.80.80.90.90.91.00.91.01.01.01.11.11.11.21.1
Percentage of Assets cpk:FirstMortgageBondDueOnTwoThousandTwentyTwo0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:NewYorkLife


Long
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-12-31
Value140140140100100100100100100
Percentage of LongTermDebt27.326.826.122.421.922.128.428.030.6
Percentage of Assets7.17.27.45.55.65.85.95.95.9
Percentage of Assets cpk:NewYorkLife0.00.00.00.00.00.00.00.00.0

cpk:PrudentialUnfundedCommitments


Long
Period End2020-09-302020-06-302019-12-312019-06-302019-03-312018-12-31
Value50500.0100100100
Percentage of LongTermDebt9.311.20.028.428.030.6
Percentage of Assets2.62.70.05.95.95.9
Percentage of Assets cpk:PrudentialUnfundedCommitments0.00.00.00.00.00.0

cpk:TermNoteDueJanuaryTwoThousandTwenty


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value7070707070700.030303030
Percentage of LongTermDebt13.613.413.413.015.715.30.06.68.58.49.2
Percentage of Assets3.53.63.63.73.83.90.01.81.81.81.8
Percentage of Assets cpk:TermNoteDueJanuaryTwoThousandTwenty0.00.00.00.00.00.00.00.00.00.00.0

cpk:UncollateralizedSeniorNoteDueOnMay2TwoThousandTwentyEight


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302017-12-31
Value4.95.65.65.65.66.36.36.36.37.07.07.07.0
Percentage of LongTermDebt1.01.11.11.01.31.41.31.41.82.02.12.83.4
Percentage of Assets0.20.30.30.30.30.40.40.40.40.40.40.50.5
Percentage of Assets cpk:UncollateralizedSeniorNoteDueOnMay2TwoThousandTwentyEight0.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwenty


Long
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value2.02.02.02.04.04.04.04.06.06.06.06.08.08.08.08.010.010.010.010.012121212141414141616161618
Percentage of LongTermDebt0.40.40.40.40.91.11.11.22.42.42.62.93.83.85.55.56.66.66.56.57.57.57.47.48.28.211.611.50.014.714.514.515.2
Percentage of Assets0.10.10.10.10.20.20.20.20.40.40.40.40.60.60.60.70.90.90.90.91.21.21.31.31.71.71.71.72.02.12.22.22.5
Percentage of Assets cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwenty0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwentySix


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-312011-06-302011-06-23
Value14171717172020202023232323262626262929292929292929292929292929292929292929292929
Percentage of LongTermDebt2.83.33.33.23.94.44.24.55.86.57.19.39.311.312.712.312.319.919.919.119.118.918.918.118.118.018.017.117.123.923.80.026.726.426.324.824.824.50.00.0
Percentage of Assets0.70.90.90.91.01.11.11.21.21.41.41.51.61.81.81.92.12.32.42.52.62.72.72.93.03.23.23.43.53.43.53.63.73.94.04.14.34.14.40.0
Percentage of Assets cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwentySix0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwentyThree


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value7.59.09.01010121213131515161618181919212122222424252527272828303030303030303030
Percentage of LongTermDebt1.51.71.72.02.42.62.53.03.84.24.66.66.67.88.89.29.214.414.414.814.815.615.615.915.916.716.716.816.824.824.60.027.627.327.225.725.725.3
Percentage of Assets0.40.50.50.60.60.70.70.80.80.90.91.11.11.31.31.41.61.71.72.02.12.22.22.52.63.03.03.43.53.63.63.83.84.14.14.34.44.2
Percentage of Assets cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwentyThree0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:UncollateralizedSeniorNoteTwoDueonDecemberTwoThousandTwentyEight


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value16161618181818202020202020202020202020202020202020202020202020
Percentage of LongTermDebt3.13.13.13.44.03.93.74.45.75.66.18.08.08.79.79.59.513.713.713.213.213.013.012.512.512.412.411.811.816.516.4
Percentage of Assets0.80.80.81.01.01.01.01.21.21.21.21.31.41.41.41.51.61.61.61.81.81.81.92.02.12.22.22.42.42.42.4
Percentage of Assets cpk:UncollateralizedSeniorNoteTwoDueonDecemberTwoThousandTwentyEight0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:UncollateralizedSeniorNotesDueOnTwoThousandTwentyNine


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302013-12-31
Value40454545455050505050505050505050505050505050505050505050500.0
Percentage of LongTermDebt7.88.68.68.410.111.010.311.114.214.015.319.919.921.724.423.723.734.334.332.932.932.632.531.331.331.031.029.529.50.0
Percentage of Assets2.02.32.32.42.52.82.82.93.03.03.03.33.43.53.53.74.04.04.14.44.64.64.75.05.25.55.55.96.10.0
Percentage of Assets cpk:UncollateralizedSeniorNotesDueOnTwoThousandTwentyNine0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302011-12-31
Value498508508519430440440375275285316241241222197201201136136143143148149155156158158165165117117107107100101108108110
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets25.326.026.327.523.624.624.721.916.417.018.716.016.515.613.914.916.011.011.112.613.113.714.015.516.117.317.519.520.113.914.013.513.813.713.915.516.015.6

Long Term Debt And Capital Lease Obligations

us-gaap:LongTermDebtAndCapitalLeaseObligations

us-gaap:LongTermDebtAndCapitalLeaseObligations


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value51252252253544545548545135135732725125123120621321314814915515615815816516516716717617612812811511510010110810811011011711789
Percentage of LongTermDebtAndCapitalLeaseObligations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets26.026.727.028.424.525.527.226.320.921.219.416.717.216.214.615.817.012.012.113.714.214.614.816.417.018.318.520.821.515.215.414.514.813.713.915.516.015.915.617.817.713.4

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value219211205202193186180156135222192161
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets11.110.810.610.710.610.410.19.39.618.118.017.8

Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent

us-gaap:PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent


Pension
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value292930272828302729292828282829323133323232323332333435182020213333333322252626161718
Percentage of PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.51.51.61.51.51.61.71.61.81.81.71.92.02.02.12.42.52.72.72.83.03.03.13.23.53.83.92.22.52.52.54.24.34.64.63.33.83.83.82.52.72.7

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value4813000.04910000.04903000.04936000.02434000.02699000.02796000.03019000.02661000.02908000.02968000.03089000.03096000.05846000.05955000.06783000.04146000.04730000.04750000.05533000.05560000.02628000.02597000.03130000.03820000.04007000.03825000.03775000.03491000.02484000.02477000.02102000.01625000.01580000.01558000.09262000.08514000.08668000.08259000.08210000.08911000.09584000.0
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.30.30.30.10.20.20.20.20.20.20.20.20.40.40.50.30.40.40.50.50.20.20.30.40.40.40.40.40.30.30.30.20.20.21.31.31.31.21.21.31.4

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-30
Value8.7199.1259.8729.68110109.8961010
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.50.50.50.60.60.60.60.6

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value1762000.01770000.01984000.01984000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value1607000.01615000.01923000.01939000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1

Lessee Operating Lease Liability Payments Due Year Four

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFour


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value1387000.01400000.01657000.01874000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFour100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value951000.0966000.01395000.01619000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0100.0100.0100.0
Percentage of Assets0.00.00.10.1

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2021-06-302021-03-312020-12-31
Value3596000.03621000.04419000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0100.0
Percentage of Assets0.20.20.2

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value1010111111
Percentage of OperatingLeaseLiability100.0100.0100.0100.0100.0
Percentage of Assets0.50.60.60.60.7

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value12121313
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0100.0100.0
Percentage of Assets0.60.70.70.7

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2021-06-302021-03-312020-12-312020-09-30
Value1757000.01908000.01786000.01863000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0100.0100.0
Percentage of Assets0.10.10.10.1

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value741726697616593584561544544543518508507505486463461460446438379374358353351317300296296293278269269267256250250248240237238226209123
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets37.637.236.132.732.632.731.531.832.432.330.633.834.735.434.334.436.737.236.338.434.634.633.535.036.234.833.235.036.134.833.333.834.536.335.035.836.835.834.036.136.033.70.00.0

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value0.558-2.638-2.865-3.629-4.462-6.194-6.267-5.403-5.747-3.739-6.713-4.987-5.718-6.873-4.272-5.259-5.244-4.458-4.878-5.029-5.168-5.751-5.84-5.471-5.479-5.568-5.676-2.469-2.473-2.502-2.533-4.903-4.958-5.013-5.062-4.327-4.394-4.46-4.527-2.817-2.999-3.36-2.524-3.748
Percentage of StockholdersEquity0.1-0.4-0.4-0.6-0.8-1.1-1.1-1.0-1.1-0.7-1.3-1.0-1.1-1.4-0.9-1.1-1.1-1.0-1.1-1.1-1.4-1.5-1.6-1.5-1.6-1.8-1.9-0.8-0.8-0.9-0.9-1.8-1.8-1.9-2.0-1.7-1.8-1.8-1.9-1.2-1.3-1.5-1.2-3.0
Percentage of Assets0.0-0.1-0.1-0.2-0.2-0.3-0.4-0.3-0.3-0.2-0.4-0.3-0.4-0.5-0.3-0.4-0.4-0.4-0.4-0.4-0.5-0.5-0.5-0.5-0.6-0.6-0.6-0.3-0.3-0.3-0.3-0.6-0.6-0.7-0.7-0.6-0.6-0.6-0.6-0.4-0.5-0.50.00.0
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value35735034828326325925925725625525525525525425325225225125025019119019018918715615615515415215215115115015015014914914914914814814466
Percentage of StockholdersEquity48.248.350.046.044.444.446.247.347.147.049.350.350.350.352.154.554.654.556.357.150.550.953.153.653.549.352.152.552.252.154.656.256.256.258.760.059.960.162.062.862.565.568.954.2
Percentage of Assets18.118.018.015.014.414.514.515.015.315.215.117.017.517.817.918.820.120.320.421.917.517.617.818.819.417.217.318.318.818.118.219.019.420.420.521.522.121.521.122.722.522.10.00.0
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value8.558.5288.4998.1268.0137.9987.9847.9847.9847.987.9717.9717.9717.9647.9557.9557.9557.9497.9357.9327.4567.4497.4327.4297.1197.17.0954.7274.7154.6914.6854.6844.6794.6714.6694.6684.6614.6564.6554.6544.6354.5723.323
Percentage of StockholdersEquity1.21.21.21.31.41.41.41.51.51.51.51.61.61.61.61.71.71.71.81.82.02.02.12.12.22.42.41.61.61.71.71.71.71.81.91.91.91.92.02.02.02.22.7
Percentage of Assets0.40.40.40.40.40.40.40.50.50.50.50.50.50.60.60.60.60.60.60.70.70.70.70.70.80.80.80.60.60.60.60.60.60.60.70.70.70.70.70.70.70.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DeferredCompensationShareBasedPayments


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value7.2036.9925.6795.6345.6595.4684.5434.5054.6944.3763.8543.8183.7823.5733.3953.3663.3363.12.4162.4762.4522.2211.8831.8631.8431.7151.2581.2171.2021.1381.1241.111.0960.9940.9820.970.9580.8280.8170.8070.7960.7770.7391.549
Percentage of StockholdersEquity1.01.00.80.91.00.90.80.80.90.80.70.80.70.70.70.70.70.70.50.60.60.60.50.50.50.50.40.40.40.40.40.40.40.40.40.40.40.30.30.30.30.30.41.3
Percentage of Assets0.40.40.30.30.30.30.30.30.30.30.20.30.30.30.20.20.30.30.20.20.20.20.20.20.20.20.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.00.0
Percentage of Assets us-gaap:DeferredCompensationShareBasedPayments0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value3743693423283263223002842852842612492502502292082062061921851851821661621611591421361391381241181181171069910098918687766356
Percentage of StockholdersEquity50.650.949.253.255.055.353.552.352.552.350.449.149.349.547.144.944.844.743.142.348.948.746.445.945.950.247.446.047.047.144.643.943.943.941.439.940.039.837.936.536.833.930.146.2
Percentage of Assets19.018.917.717.417.918.116.916.617.016.915.416.617.117.516.215.516.516.715.616.216.916.815.616.116.617.515.716.117.016.414.814.815.215.914.514.314.714.212.913.213.311.40.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:TreasuryStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312009-12-312008-12-31
Value-7.203-6.992-5.679-5.634-5.659-5.468-4.543-4.505-4.694-4.376-3.854-3.818-3.782-3.573-3.395-3.366-3.336-3.1-2.416-2.476-2.452-2.221-1.883-1.863-1.843-1.715-1.258-1.217-1.202-1.138-1.124-1.11-1.096-0.994-0.982-0.97-0.958-0.828-0.817-0.807-0.796-0.777-0.739-1.549
Percentage of StockholdersEquity-1.0-1.0-0.8-0.9-1.0-0.9-0.8-0.8-0.9-0.8-0.7-0.8-0.7-0.7-0.7-0.7-0.7-0.7-0.5-0.6-0.6-0.6-0.5-0.5-0.5-0.5-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.4-1.3
Percentage of Assets-0.4-0.4-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.2-0.3-0.3-0.3-0.2-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.1-0.10.00.0
Percentage of Assets us-gaap:TreasuryStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value8550000.08528000.08499000.08126000.08013000.07998000.07984000.07984000.07984000.07980000.07971000.07971000.07971000.07964000.07955000.07955000.07955000.07949000.07935000.07932000.07456000.07449000.07432000.07429000.07419000.07119000.07100000.07095000.04727000.04715000.04691000.04685000.04684000.04679000.04671000.04669000.04668000.04661000.04656000.04655000.04654000.04635000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.40.40.40.40.40.50.50.50.50.50.50.60.60.60.60.60.60.70.70.70.70.70.80.80.80.80.60.60.60.60.60.60.60.70.70.70.70.70.70.7

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value357350348283263259259257256255255255255254253252252251250250191190190189187156156155154152152151151150150150149149149149148148
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets18.118.018.015.014.414.514.515.015.315.215.117.017.517.817.918.820.120.320.421.917.517.617.818.819.417.217.318.318.818.118.219.019.420.420.521.522.121.521.122.722.522.1

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value374369342328326322300284285284261249250250229208206206192185185182166162161159142136139138124118118117106991009891868776
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets19.018.917.717.417.918.116.916.617.016.915.416.617.117.516.215.516.516.715.616.216.916.815.616.116.617.515.716.117.016.414.814.815.215.914.514.314.714.212.913.213.311.4

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value558000.0-2638000.0-2865000.0-3629000.0-4462000.0-6194000.0-6267000.0-5403000.0-5747000.0-3739000.0-6713000.0-4987000.0-5718000.0-6873000.0-4272000.0-5259000.0-5244000.0-4458000.0-4878000.0-5029000.0-5168000.0-5751000.0-5840000.0-5471000.0-5479000.0-5568000.0-5676000.0-2469000.0-2473000.0-2502000.0-2533000.0-4903000.0-4958000.0-5013000.05062000.0-4327000.0-4394000.0-4460000.0-4527000.0-2817000.0-2999000.0-3360000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.0-0.1-0.1-0.2-0.2-0.3-0.4-0.3-0.3-0.2-0.4-0.3-0.4-0.5-0.3-0.4-0.4-0.4-0.4-0.4-0.5-0.5-0.5-0.5-0.6-0.6-0.6-0.3-0.3-0.3-0.3-0.6-0.6-0.70.7-0.6-0.6-0.6-0.6-0.4-0.5-0.5

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

cpk:AOCIChangesForDefinedBenefitPensionAndPostretirementPlans


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-31
Value-5018000.0-5083000.0-5146000.0-4735000.0-4801000.0-4867000.0-4933000.0-5696000.0-5715000.0-5821000.0-5928000.0-5490000.0-5576000.0-5671000.0-4743000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-899.3192.7179.6130.5107.678.678.7105.499.4155.788.3110.197.582.5111.0
Percentage of Assets-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.3-0.4-0.4-0.4-0.4-0.3
Percentage of Assets cpk:AOCIChangesForDefinedBenefitPensionAndPostretirementPlans0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:AccumulatedGainLossFromInterestRateSwapCashFlowsHedges


Accumulated
Period End2020-12-31
Value-28000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax1.0
Percentage of Assets-0.0
Percentage of Assets cpk:AccumulatedGainLossFromInterestRateSwapCashFlowsHedges0.0

cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312012-12-31
Value5600000.02475000.02309000.01116000.0376000.0-1327000.0-1334000.0293000.0-32000.02082000.0-785000.0503000.0-142000.0-1202000.0471000.0-161000.0-55000.0820000.0482000.0288000.0236000.0-260000.0-260000.0-76000.0-1000.0-7000.0-33000.0-28000.0-1000.0000
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax1003.6-93.8-80.6-30.8-8.421.421.3-5.40.6-55.711.7-10.12.517.5-11.03.11.0-18.4-9.9-5.7-4.64.54.51.40.00.10.61.10.0-0.0-0.00.0
Percentage of Assets0.30.10.10.10.0-0.1-0.10.0-0.00.1-0.00.0-0.0-0.10.0-0.0-0.00.10.00.00.0-0.0-0.0-0.0-0.0-0.0-0.0-0.0-0.00.00.00.0
Percentage of Assets cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value-24000.0-30000.0-28000.0-10000.0-37000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax-4.31.11.00.30.8
Percentage of Assets-0.0-0.0-0.0-0.0-0.0
Percentage of Assets cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges0.00.00.00.00.0

Treasury Stock Value

us-gaap:TreasuryStockValue

us-gaap:TreasuryStockValue


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value7203000.06992000.05679000.05634000.05659000.05468000.04543000.04505000.04694000.04376000.03854000.03818000.03782000.03573000.03395000.03366000.03336000.03100000.02416000.02476000.02452000.02221000.01883000.01863000.01843000.01715000.01258000.01217000.01202000.01138000.01124000.01110000.01096000.0994000.0982000.0970000.0958000.0828000.0817000.0807000.0796000.0777000.0
Percentage of TreasuryStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.40.40.30.30.30.30.30.30.30.30.20.30.30.30.20.20.30.30.20.20.20.20.20.20.20.20.10.10.10.10.10.10.10.10.10.10.10.10.10.10.10.1

New Accounting Pronouncement Or Change In Accounting Principle Effect Of Adoption Quantification

us-gaap:NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification us-gaap:StatementEquityComponents

us-gaap:NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification

us-gaap:RetainedEarnings


New
Period End2020-09-302019-09-302019-06-302019-03-312018-03-31
Value000115000.0-1498000.0
Percentage of NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification0.00.00.0100.0100.0
Percentage of Assets0.00.00.00.00.0
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value538043243258-0.97529344018194166112.0023659218.0731426.458102364146.13812456.5041219341.7763.583253418-7.31525346.324-2.22
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.542.031.423.933.938.5-0.731.726.017.89.314.030.527.96.51.629.132.414.97.431.029.06.211.925.637.712.46.712.224.75.314.320.324.81.64.630.928.617.6-9.129.723.45.4-2.9

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-52682000.0-51847000.0-45080000.0-56297000.0-48756000.0-31498000.0-46674000.0-49033000.0-47511000.0-43369000.0-115100000.0-44506000.0-63690000.0-62971000.0-45442000.0-52876000.0-46384000.0-42193000.0-63045000.0-36859000.0-33238000.0-36895000.0-42573000.0-37312000.0-58314000.0-27359000.0-17976000.0-26237000.0-23912000.0-18461000.0-29013000.0-24843000.0-42285000.0-18640000.0-20659000.0-16961000.0-19456000.0-12753000.0-14539000.0-11879000.0-13198000.0-8220000.0-19981000.0-14655000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-47.4-27.1-32.9-55.5-50.2-20.6-35.4-52.9-36.3-19.1-57.2-31.7-46.6-26.3-25.2-41.7-37.1-22.8-44.4-34.0-32.5-25.2-40.7-40.6-62.9-16.1-14.9-28.6-23.8-9.9-23.6-28.7-44.9-13.2-18.9-21.7-23.2-10.5-14.0-14.7-15.2-5.6-17.0-19.2

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-1.716-26.4592.4873115-30.3135016124.769962620-3.31935516.687-16.23944271.462-5.073352820-25.0825.341199.427-26.103241222-17.0812013-6.817-22.387-2.94119-12.777-25.7091210
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.5-13.81.831.116.0-19.938.118.19.72.147.818.915.0-1.419.940.85.3-8.831.425.01.4-3.533.730.522.1-14.74.421.79.4-14.019.613.924.2-12.118.417.5-8.1-18.5-2.823.7-14.7-17.510.713.6

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-564000.02076000.0443000.0-534000.0-392000.0-3003000.02665000.0-2934000.0-721000.01886000.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-0.51.10.3-0.5-0.4-2.02.0-3.2-0.60.8

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value6.4766.3342.0169.9526.4945.738151.0434.3163.43103.3791.1996.469-18.435174.1857.849195.8421.8364.326210.211-0.87-0.49622-0.3220.397-0.2314.9134.1513.5882.2081.7793.543.1895.3733.5311.7343.568.8893.5426.164
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Depreciation Depletion And Amortization

us-gaap:DepreciationDepletionAndAmortization

us-gaap:DepreciationDepletionAndAmortization


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1515151812121111111110109.8399.7049.3329.3629.0948.8128.6668.2097.787.5037.8177.6367.5436.9756.176.7746.7366.6355.8946.2745.9775.825.0975.7675.8855.7615.2174.9784.9375.0214.4614.6884.545
Percentage of DepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Accounts Receivable

us-gaap:IncreaseDecreaseInAccountsReceivable

us-gaap:IncreaseDecreaseInAccountsReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-24.1480.484171.2-3.316-8.13915-0.635-33.215-18.14749-0.758-22.581-9.6493213-21.767-5.095236.099-6.0023.7384.801-1.704-28.2088.01417-1.591-40.363.64720-5.701-2.3898.657140.58-27.343-9.7613-14.958-6.551-7.466433.148
Percentage of IncreaseDecreaseInAccountsReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Inventories

us-gaap:IncreaseDecreaseInInventories

us-gaap:IncreaseDecreaseInInventories


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value2456000.0-1371000.01115000.01316000.0-219000.0-3921000.0-231000.0-1538000.0749000.0-7207000.04272000.03465000.02604000.0-12448000.0780000.05713000.09231000.0-6688000.0352000.02842000.02410000.0-3073000.01639000.01239000.0932000.0-5337000.0-40000.01937000.02169000.0-8243000.03559000.03113000.02884000.0-5064000.03119000.01694000.0414000.0-5830000.02643000.03156000.02462000.0-5777000.0-562000.03793000.0
Percentage of IncreaseDecreaseInInventories100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Increase Decrease In Other Operating Capital Net

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet

us-gaap:IncreaseDecreaseInOtherOperatingCapitalNet


Increase
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-30
Value4436000.0-3761000.0-120000.02551000.01315000.0981000.04531000.0-3585000.0-1318000.02207000.0-347000.0-2905000.04885000.0-1631000.0-733000.03028000.0-1242000.0337000.03068000.0-2753000.01706000.0-303000.0240000.065000.033000.0-21000.03677000.0
Percentage of IncreaseDecreaseInOtherOperatingCapitalNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value538043243258-0.97529344018194166112.0023659218.0731426.458102364146.13812456.5041219341.7763.583253418-7.31525346.324-2.22
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax48.542.031.423.933.938.5-0.731.726.017.89.314.030.527.96.51.629.132.414.97.431.029.06.211.925.637.712.46.712.224.75.314.320.324.81.64.630.928.617.6-9.129.723.45.4-2.9

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1334229.2611028225.6218.30428175.5386.38726266.8336.04619114.4168.029208.6195.1196.29421103.185.134179.6833.8794.356149.8573.2195.06107.9572.3973.52137.1141.6283.34
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.418.016.39.111.318.917.16.16.312.68.83.94.711.214.55.44.810.38.44.17.813.98.25.66.812.48.43.55.19.57.94.54.610.69.04.16.08.97.73.04.19.46.02.14.2

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value13349.2611028225.6218.30428175.5386.38726266.8336.04619114.4168.029208.6195.1186.29421103.185.134179.6833.8794.356149.8573.2195.06107.9582.397
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.418.09.111.318.917.16.16.312.68.83.94.711.214.55.44.810.38.44.17.813.98.25.66.812.48.43.55.19.57.94.54.610.69.04.16.08.97.73.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1439000.01876000.01175000.01332000.01266000.01056000.01974000.01210000.0608000.0487000.0278000.0288000.0727000.01520000.0882000.0796000.0173000.0639000.0480000.0623000.0615000.0649000.0492000.0498000.0410000.0537000.0439000.0454000.0427000.0638000.0385000.0385000.0480000.0381000.0308000.0414000.0352000.0345000.0372000.0373000.0376000.0329000.0256000.0287000.0
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-52682000.0-51847000.0-45080000.0-56297000.0-48756000.0-31498000.0-46674000.0-49033000.0-47511000.0-43369000.0-115100000.0-44506000.0-63690000.0-62971000.0-45442000.0-52876000.0-46384000.0-42193000.0-63045000.0-36859000.0-33238000.0-36895000.0-42573000.0-37312000.0-58314000.0-27359000.0-17976000.0-26237000.0-23912000.0-18461000.0-29013000.0-24843000.0-42285000.0-18640000.0-20659000.0-16961000.0-19456000.0-12753000.0-14539000.0-11879000.0-13198000.0-8220000.0-19981000.0-14655000.0
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-47.4-27.1-32.9-55.5-50.2-20.6-35.4-52.9-36.3-19.1-57.2-31.7-46.6-26.3-25.2-41.7-37.1-22.8-44.4-34.0-32.5-25.2-40.7-40.6-62.9-16.1-14.9-28.6-23.8-9.9-23.6-28.7-44.9-13.2-18.9-21.7-23.2-10.5-14.0-14.7-15.2-5.6-17.0-19.2

Payments To Acquire Property Plant And Equipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment

us-gaap:PaymentsToAcquirePropertyPlantAndEquipment


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value52514240473545484743984463634541464263363336423737272826241828272516211619141312128.3551912
Percentage of PaymentsToAcquirePropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-1.716-26.4592.4873115-30.3135016124.769962620-3.31935516.687-16.23944271.462-5.073352820-25.0825.341199.427-26.103241222-17.0812013-6.817-22.387-2.94119-12.777-25.7091210
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax-1.5-13.81.831.116.0-19.938.118.19.72.147.818.915.0-1.419.940.85.3-8.831.425.01.4-3.533.730.522.1-14.74.421.79.4-14.019.613.924.2-12.118.417.5-8.1-18.5-2.823.7-14.7-17.510.713.6

Proceeds From Issuance Of Long Term Debt

us-gaap:ProceedsFromIssuanceOfLongTermDebt

us-gaap:ProceedsFromIssuanceOfLongTermDebt


Proceeds
Period End2020-12-312020-09-302019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302013-12-312013-09-302012-12-312012-09-30
Value-0.005896999-0.0443079-0.01549250.0070.0690.00.00.00.00.00.0-0.025200.00.00.0
Percentage of ProceedsFromIssuanceOfLongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.00.00.00.0100.0100.00.00.00.0

Repayments Of Long Term Debt

us-gaap:RepaymentsOfLongTermDebt

us-gaap:RepaymentsOfLongTermDebt


Repayments
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value130.01030350.06.0210.4143.8340.365290.4286.590.3454.7490.4166.5650.3551.8240.4026.5580.3283.8580.0768.249-0.0141.5380.1966.5820.0398.5550.0156.7430.0151.4240.027.744-0.0921.4470.0355.6530.93
Percentage of RepaymentsOfLongTermDebt100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value7.5347.5137.1177.0686.4936.4836.4586.4765.8825.8775.8725.875.1545.1475.1485.1444.8214.8154.5184.5114.2494.2044.1994.1933.9593.5733.5683.5653.3853.3693.3653.363.183.1763.1753.1732.9982.9892.992.9882.8492.8362.8262.818
Percentage of PaymentsOfDividendsCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Dividends

us-gaap:Dividends

us-gaap:Dividends


Dividends
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302014-06-302014-03-31
Value8.57.8127.747.3587.3066.7036.6516.6896.6536.1986.0766.116.0345.3815.3625.3275.3445.0124.9964.424.4153.6383.78
Percentage of Dividends100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:Dividends us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividendsus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312015-09-302014-06-302014-03-31
Value8.57.8127.747.358-7.3066.703-6.651-6.6896.6536.1986.0766.116.0345.3815.3625.3275.3445.0124.9964.424.4153.963.779
Percentage of Dividends100.0100.0100.0100.0-100.0100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0108.9100.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateStatedPercentage

cpk:FirstMortgageBondDueOnTwoThousandTwentyTwo


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-06-30
Value9.089.089.089.080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.09080.0910.09080.09080.0908
Percentage of DebtInstrumentInterestRateStatedPercentage100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations cpk:FirstMortgageBondDueOnTwoThousandTwentyTwo0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:UncollateralizedSeniorNoteDueOnMay2TwoThousandTwentyEight


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value6.436.436.436.430.06430.06430.06430.06430.06430.06430.06430.0643
Percentage of DebtInstrumentInterestRateStatedPercentage70.870.870.870.870.870.870.870.870.870.870.870.8
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations cpk:UncollateralizedSeniorNoteDueOnMay2TwoThousandTwentyEight0.00.00.00.00.00.00.00.00.00.00.00.0

cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwenty


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value5.55.55.55.50.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.0550.055
Percentage of DebtInstrumentInterestRateStatedPercentage60.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.660.460.660.6
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwenty0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwentySix


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-09-302011-06-302011-06-23
Value5.685.685.685.680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.05680.0570.05680.05680.05680.0570.0568
Percentage of DebtInstrumentInterestRateStatedPercentage62.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.662.60.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwentySix0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwentyThree


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-06-30
Value5.935.935.935.930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.05930.0590.05930.05930.0593
Percentage of DebtInstrumentInterestRateStatedPercentage65.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.365.364.865.365.365.3
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations cpk:UncollateralizedSeniorNoteDueOnTwoThousandTwentyThree0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:UncollateralizedSeniorNoteTwoDueonDecemberTwoThousandTwentyEight


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-31
Value3.733.733.733.730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.03730.0373
Percentage of DebtInstrumentInterestRateStatedPercentage41.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.141.1
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations cpk:UncollateralizedSeniorNoteTwoDueonDecemberTwoThousandTwentyEight0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod

cpk:Awardstononemployeedirector


Share
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value000254.0-22.000276.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.00.00.0100.0100.00.00.0100.0

cpk:Awardstononemployeedirectors


Share
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312017-06-302017-03-312016-12-312016-09-302015-12-312015-09-302014-12-312014-09-30
Value-204.0887.00136.0751.005967.0792.0-118.0953.00000528.04433.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.00.00.00.0295.70.00.0287.00.00.00.00.00.00.00.00.0

cpk:Awardtokeyemployees


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value187.066425.0669.02488.01082.065775.043032.00045016.000049494.00013838.038517.000046571.003956.0029763.0013814.0027628.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.00.00.00.00.025895.7-195600.00.00.016310.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

cpk:Total


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-31
Value-2040.08870.0002111.06759.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod0.00.00.00.00.02661.0

cpk:AdditionalFirmNaturalGasTransportationDeliverability us-gaap:StatementGeographical, us-gaap:CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProject

cpk:AdditionalFirmNaturalGasTransportationDeliverability

cpk:EasternShoreGasCompany, cpk:DelMarPathwayProject


Additional
Period End2021-06-302021-03-31
Value014300.0
Percentage of AdditionalFirmNaturalGasTransportationDeliverability0.0100.0

cpk:AmountsSpenttoRestoreService us-gaap:StatementGeographical

cpk:AmountsSpenttoRestoreService

cpk:ElectricLimitedProceedings


Amounts
Period End2020-12-31
Value0.0
Percentage of AmountsSpenttoRestoreService0.0

cpk:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRegulatoryLiabilities us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

cpk:BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRegulatoryLiabilities

cpk:ElktonGas, cpk:RegulatedEnergy


Business
Period End2021-06-302021-03-312020-12-31
Value02600000.00
Percentage of BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedRegulatoryLiabilities0.0100.00.0

cpk:CostRecoveryCapital us-gaap:StatementGeographical

cpk:CostRecoveryCapital

cpk:EasternShoreGasCompany


Cost
Period End2020-12-31
Value0
Percentage of CostRecoveryCapital0.0

cpk:DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset

cpk:DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value124000.0124000.0109000.0109000.0109000.0104000.0105000.0105000.070000.087000.088000.0106000.0106000.0106000.0108000.0104000.0104000.094000.094000.094000.000066000.066000.066000.0
Percentage of DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0

cpk:DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset us-gaap:RetirementPlanName

cpk:FloridaPublicUtilitiesCompanyPensionPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value126000.0126000.0109000.0109000.0109000.0104000.0105000.0105000.070000.087000.088000.0106000.0106000.0106000.0
Percentage of DefinedBenefitPlanAmountsRecognizedFromRegulatoryAsset101.6101.6100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:DefinedBenefitPlanAmountsRecognizedGainLoss

cpk:DefinedBenefitPlanAmountsRecognizedGainLoss


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-30
Value211000.0209000.0198000.0198000.0198000.0238000.0249000.0249000.0189000.0217000.0218000.0258000.0256000.0257000.0254000.0250000.0252000.0232000.0232000.0231000.051000.052000.052000.0158000.0158000.0
Percentage of DefinedBenefitPlanAmountsRecognizedGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:DefinedBenefitPlanAmountsRecognizedGainLoss us-gaap:RetirementPlanName

cpk:ChesapeakePensionPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value60000.060000.065000.065000.065000.0101000.0101000.0101000.082000.088000.088000.0107000.0106000.0107000.0
Percentage of DefinedBenefitPlanAmountsRecognizedGainLoss28.428.732.832.832.842.440.640.643.440.640.441.541.441.6

cpk:ChesapeakePensionSerp


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value7000.07000.05000.05000.05000.017000.026000.026000.025000.025000.025000.022000.022000.022000.0
Percentage of DefinedBenefitPlanAmountsRecognizedGainLoss3.33.32.52.52.57.110.410.413.211.511.58.58.68.6

cpk:ChesapeakePostretirementPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-9000.0-11000.0-7000.0-7000.0-7000.0-8000.0-7000.0-7000.0-4000.0-4000.0-4000.0-2000.0-3000.0-3000.0
Percentage of DefinedBenefitPlanAmountsRecognizedGainLoss-4.3-5.3-3.5-3.5-3.5-3.4-2.8-2.8-2.1-1.8-1.8-0.8-1.2-1.2

cpk:FloridaPublicUtilitiesCompanyPensionPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value155000.0155000.0135000.0135000.0135000.0128000.0129000.0129000.086000.0108000.0109000.0131000.0131000.0131000.0
Percentage of DefinedBenefitPlanAmountsRecognizedGainLoss73.574.268.268.268.253.851.851.845.549.850.050.851.251.0

cpk:DepreciationAndAccretionIncludedInOtherCosts

cpk:DepreciationAndAccretionIncludedInOtherCosts


Depreciation
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value2493000.02568000.02537000.02255000.02446000.02361000.02372000.02058000.02187000.02135000.02071000.02036000.02152000.02276000.02133000.02050000.02000000.01939000.01977000.01921000.01790000.01646000.01698000.01794000.01797000.01689000.01425000.01705000.01664000.01783000.01619000.01474000.01554000.01476000.01468000.01393000.01288000.01398000.01361000.01282000.01418000.01055000.01116000.01049000.0
Percentage of DepreciationAndAccretionIncludedInOtherCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:DepreciationandAmortizationCosts

cpk:DepreciationandAmortizationCosts


Depreciationand
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-30
Value15151812121111
Percentage of DepreciationandAmortizationCosts100.0100.0100.0100.0100.0100.0100.0

cpk:DiscontinuedOperationGainLossfromDisposalofDiscontinuedOperationbeforeIncomeTaxIncremental

cpk:DiscontinuedOperationGainLossfromDisposalofDiscontinuedOperationbeforeIncomeTaxIncremental


Discontinued
Period End2020-09-302020-06-30
Value0200000.0
Percentage of DiscontinuedOperationGainLossfromDisposalofDiscontinuedOperationbeforeIncomeTaxIncremental0.0100.0

cpk:FeesOnEquityIssuanceAtTheMarket

cpk:FeesOnEquityIssuanceAtTheMarket


Fees
Period End2021-03-312020-09-30
Value1500000.0400000.0
Percentage of FeesOnEquityIssuanceAtTheMarket100.0100.0

cpk:FeesOnEquityIssuanceAtTheMarket us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Fees
Period End2020-10-31
Value1100000.0
Percentage of FeesOnEquityIssuanceAtTheMarket0.0

cpk:GainLossFromDiscontinuedOperations us-gaap:DisposalGroupClassification, us-gaap:StatementBusinessSegments

cpk:GainLossFromDiscontinuedOperations

us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySale, us-gaap:DiscontinuedOperationsDisposedOfBySale


Gain
Period End2020-09-302019-09-30
Value-19000.0-630000.0
Percentage of GainLossFromDiscontinuedOperations100.0100.0

cpk:IncrementalRevenueStormCostRecovery

cpk:IncrementalRevenueStormCostRecovery


Incremental
Period End2021-06-302021-03-312020-12-31
Value03300000.00
Percentage of IncrementalRevenueStormCostRecovery0.0100.00.0

cpk:MaximumAmountOfEnvironmentalCostsThatCanBeRecoveredFromInsuranceAndCustomers dei:LegalEntity

cpk:MaximumAmountOfEnvironmentalCostsThatCanBeRecoveredFromInsuranceAndCustomers

cpk:FloridaPublicUtilitiesCompany


Maximum
Period End2021-06-302021-03-312020-12-31
Value0.0140.0
Percentage of MaximumAmountOfEnvironmentalCostsThatCanBeRecoveredFromInsuranceAndCustomers0.0100.00.0

cpk:NumberofDisposalTransactions

cpk:NumberofDisposalTransactions


Numberof
Period End2020-09-302020-06-302019-09-30
Value04.03.0
Percentage of NumberofDisposalTransactions0.0100.0100.0

cpk:Numberofcustomersacquiredthroughacquisition us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

cpk:Numberofcustomersacquiredthroughacquisition

cpk:ElktonGas, cpk:RegulatedEnergy


Numberofcustomersacquiredthroughacquisitionus-gaap:
Period End2020-09-302020-06-302020-03-31
Value007000.0
Percentage of Numberofcustomersacquiredthroughacquisition0.00.0100.0

cpk:Operations

cpk:Operations


Operations
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value363936343435383232373632363234293032323028272826262625252426252122212120201920192019211818
Percentage of Operations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:OtherComprehensiveIncomeLossAdjustmentsAOCISwapAgreements us-gaap:DerivativeInstrumentRisk, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

cpk:OtherComprehensiveIncomeLossAdjustmentsAOCISwapAgreements

cpk:PropaneSwapAgreement, us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value455000.03047000.0116000.0238000.01227000.0290000.0252000.0606000.0-276000.0-181000.0-464000.0198000.077000.0388000.0
Percentage of OtherComprehensiveIncomeLossAdjustmentsAOCISwapAgreements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:OtherComprehensiveIncomeLossAdjustmentsAOCISwapAgreements us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges


Other
Period End2020-09-302020-06-30
Value34000.011000.0
Percentage of OtherComprehensiveIncomeLossAdjustmentsAOCISwapAgreements29.34.6

cpk:OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax

cpk:OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax


Other
Period End2021-06-302021-03-312020-09-302020-06-302019-06-30
Value2000.0-1000.010000.0-14000.00
Percentage of OtherComprehensiveIncomeLossUnrealizedGainLossonInterestRateSwapsDuringPeriodTax100.0100.0100.0100.00.0

cpk:PaymentsForEnvironmentalExpenditures

cpk:PaymentsForEnvironmentalExpenditures


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value148000.0247000.0148000.073000.01526000.0422000.0245000.0281000.0376000.0268000.0
Percentage of PaymentsForEnvironmentalExpenditures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:PeriodicCostBenefit us-gaap:RetirementPlanName

cpk:PeriodicCostBenefit

cpk:ChesapeakePensionPlan


Periodic
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value54000.054000.069000.069000.069000.078000.078000.079000.045000.048000.047000.083000.082000.083000.0
Percentage of PeriodicCostBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:ChesapeakePensionSerp


Periodic
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value19000.019000.021000.021000.021000.091000.047000.047000.046000.046000.046000.044000.044000.044000.0
Percentage of PeriodicCostBenefit35.235.230.430.430.4116.760.359.5102.295.897.953.053.753.0

cpk:ChesapeakePostretirementPlan


Periodic
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-3000.0-5000.01000.01000.01000.02000.02000.03000.06000.05000.06000.09000.08000.07000.0
Percentage of PeriodicCostBenefit-5.6-9.31.41.41.42.62.63.813.310.412.810.89.88.4

cpk:FloridaPublicUtilitiesCompanyMedicalPlan


Periodic
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value4000.04000.012000.012000.012000.014000.014000.014000.014000.015000.014000.015000.015000.015000.0
Percentage of PeriodicCostBenefit7.47.417.417.417.417.917.917.731.131.229.818.118.318.1

cpk:FloridaPublicUtilitiesCompanyPensionPlan


Periodic
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-246000.0-246000.0-92000.0-92000.0-92000.0211000.0242000.0241000.077000.0117000.0118000.0246000.0246000.0246000.0
Percentage of PeriodicCostBenefit-455.6-455.6-133.3-133.3-133.3270.5310.3305.1171.1243.8251.1296.4300.0296.4

cpk:ProceedsFromIssuanceOfCommonStockAtTheMarket

cpk:ProceedsFromIssuanceOfCommonStockAtTheMarket


Proceeds
Period End2021-03-312020-09-30
Value6110
Percentage of ProceedsFromIssuanceOfCommonStockAtTheMarket100.0100.0

cpk:ProceedsFromIssuanceOfCommonStockAtTheMarket us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Proceeds
Period End2020-10-31
Value50
Percentage of ProceedsFromIssuanceOfCommonStockAtTheMarket0.0

cpk:ProceedsfromDivestitureofBusinessesIncremental

cpk:ProceedsfromDivestitureofBusinessesIncremental


Proceedsfrom
Period End2020-09-30
Value0
Percentage of ProceedsfromDivestitureofBusinessesIncremental0.0

cpk:RegulatedEnergyCostOfSales

cpk:RegulatedEnergyCostOfSales


Regulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value144324161634281918363221204831222440282421342123215732232454322222413022233529252447392724
Percentage of RegulatedEnergyCostOfSales100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:RegulatoryAssetStormCostRecovery

cpk:RegulatoryAssetStormCostRecovery


Regulatory
Period End2021-06-302021-03-312020-12-31
Value0.0450.0
Percentage of RegulatoryAssetStormCostRecovery0.0100.00.0

cpk:SettlementGain

cpk:SettlementGain


Settlement
Period End2020-12-312020-09-302020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-30
Value00130000.000130000.000130000.0
Percentage of SettlementGain0.00.0100.00.00.0100.00.00.0100.0

cpk:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpirationsWeightedAverageGrantDateFairValue us-gaap:PlanName

cpk:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpirationsWeightedAverageGrantDateFairValue

cpk:Awardtokeyemployees


Share
Period End2021-06-302021-03-31
Value074.85
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpirationsWeightedAverageGrantDateFairValue0.0100.0

cpk:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriod us-gaap:PlanName

cpk:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriod

cpk:Awardtokeyemployees


Share
Period End2021-06-302021-03-312019-12-312019-09-302018-12-312018-09-30
Value0-852.00000
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpiredInPeriod0.0100.00.00.00.00.0

cpk:StandbyLettersOfCredit

cpk:StandbyLettersOfCredit


Standby
Period End2021-06-302021-03-312020-12-312013-03-312012-12-31
Value04800000.00304000.00
Percentage of StandbyLettersOfCredit0.0100.00.0100.00.0

cpk:StockIssuedDuringThePeriodSharesRetirementSavingsPlanAndDividendReinvestmentPlan us-gaap:StatementEquityComponents

cpk:StockIssuedDuringThePeriodSharesRetirementSavingsPlanAndDividendReinvestmentPlan

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312017-03-312016-12-312015-12-31
Value39605.020511.0765350.0232680.021833.03743.00005733.06212.06986.0
Percentage of StockIssuedDuringThePeriodSharesRetirementSavingsPlanAndDividendReinvestmentPlan100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0

cpk:StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan

cpk:StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-03-312016-12-31
Value4.6212.214191.9320.3540.006-0.001-0.001-0.0010.0050.0-0.001-0.0010.3790.368
Percentage of StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0

cpk:StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-06-302018-03-312017-03-312016-12-312015-12-31
Value4.6022.204191.9210.3520.006-0.001-0.001-0.0010.005-0.001-0.0010.3760.3660.365
Percentage of StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan99.699.599.499.499.4100.0100.0100.0100.0100.0100.0100.099.299.50.0

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-03-312017-03-312016-12-312015-12-31
Value0.0190.010.1130.0110.0020.00.00.00.00.0030.0020.003
Percentage of StockIssuedDuringThePeriodValueRetirementSavingsPlanAndDividendReinvestmentPlan0.40.50.60.60.6-0.0-0.0-0.0-0.00.80.50.0

cpk:SurchargeStormCostRecovery

cpk:SurchargeStormCostRecovery


Surcharge
Period End2021-06-302021-03-312020-12-31
Value07700000.00
Percentage of SurchargeStormCostRecovery0.0100.00.0

cpk:TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue us-gaap:StatementEquityComponents

cpk:TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue

us-gaap:DeferredCompensationShareBasedPayments


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value211000.01313000.045000.0-25000.0191000.0925000.038000.0-189000.0318000.0522000.036000.036000.0209000.0178000.029000.030000.0236000.0684000.0-60000.024000.0231000.0338000.020000.020000.0128000.0457000.041000.015000.092000.0-14000.0
Percentage of TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TreasuryStock


Treasury
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value-211000.0-1313000.0-45000.025000.0-191000.0-925000.0-38000.0189000.0-318000.0-522000.0-36000.0-36000.0-209000.0-178000.0-29000.0-30000.0-236000.0-684000.060000.0-24000.0-231000.0-338000.0-20000.0-20000.0-128000.0-457000.0-41000.0-15000.0-92000.014000.0
Percentage of TreasuryStockActivityAndDeferredCompensationPlanActivityDuringPeriodValue-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0-100.0

cpk:UnregulatedEnergyAndOtherCostOfSales

cpk:UnregulatedEnergyAndOtherCostOfSales


Unregulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1231155.646.57318145.70942898455499973444060432822342317203530222861352128402917193429202444331720
Percentage of UnregulatedEnergyAndOtherCostOfSales100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllocatedShareBasedCompensationExpenseNetOfTax

us-gaap:AllocatedShareBasedCompensationExpenseNetOfTax


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value1055000.01380000.0876000.0984000.0935000.0780000.01457000.0895000.0451000.0360000.0202000.0209000.0962000.01104000.0526000.0476000.0103000.0382000.0288000.0372000.0367000.0388000.0294000.0298000.0245000.0320000.0261000.0271000.0255000.0381000.0230000.0230000.0275000.0228000.0185000.0249000.0210000.0207000.0223000.0223000.0225000.0
Percentage of AllocatedShareBasedCompensationExpenseNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AllowanceForDoubtfulAccountsReceivableRecoveries

us-gaap:AllowanceForDoubtfulAccountsReceivableRecoveries


Allowance
Period End2020-12-31
Value36000.0
Percentage of AllowanceForDoubtfulAccountsReceivableRecoveries100.0

us-gaap:AllowanceForLoanAndLeaseLossesWriteOffs

us-gaap:AllowanceForLoanAndLeaseLossesWriteOffs


Allowance
Period End2020-12-31
Value398000.0
Percentage of AllowanceForLoanAndLeaseLossesWriteOffs100.0

us-gaap:BusinessCombinationConsiderationTransferred1 us-gaap:BusinessAcquisition, us-gaap:StatementBusinessSegments

us-gaap:BusinessCombinationConsiderationTransferred1

cpk:ElktonGas, cpk:RegulatedEnergy


Business
Period End2021-06-302021-03-312020-12-31
Value0.0150.0
Percentage of BusinessCombinationConsiderationTransferred10.0100.00.0

cpk:WesternNaturalGas, cpk:UnregulatedEnergy


Business
Period End2021-06-302021-03-312020-12-31
Value0.06.70.0
Percentage of BusinessCombinationConsiderationTransferred10.042.90.0

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths dei:LegalEntity

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths

cpk:SharpEnergyInc


Cash
Period End2021-06-302021-03-312020-12-312020-09-302019-06-302019-03-312018-12-31
Value2200000.03200000.01700000.0700000.0-497000.0-503000.0843000.0
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths us-gaap:DerivativeInstrumentRisk

us-gaap:InterestRateSwap


Cash
Period End2021-06-302021-03-312020-12-312020-09-30
Value0100000.000
Percentage of CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths0.03.10.00.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.480.440.440.440.440.4050.4050.4050.4050.370.370.370.370.3250.3250.3250.3250.3050.3050.3050.3050.28750.28750.28750.2880.270.270.270.4050.3850.3850.3850.3850.3650.360.3650.3650.3450.3450.3450.3450.330.330.330.33
Percentage of CommonStockDividendsPerShareDeclared100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractWithCustomerLiabilityRevenueRecognized

us-gaap:ContractWithCustomerLiabilityRevenueRecognized


Contract
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value200000.0400000.0500000.0200000.0200000.0400000.0300000.0200000.0200000.0287000.0316000.048000.084000.0251000.0
Percentage of ContractWithCustomerLiabilityRevenueRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanActuarialGainLoss

us-gaap:DefinedBenefitPlanActuarialGainLoss


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value-0.23-0.228-0.217-0.217-0.217-0.257-0.268-0.268-0.208-0.236-0.237-0.277-0.276-0.276-0.274
Percentage of DefinedBenefitPlanActuarialGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanActuarialGainLoss us-gaap:RetirementPlanName

cpk:ChesapeakePensionPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-0.06-0.06-0.065-0.065-0.065-0.101-0.101-0.101-0.082-0.088-0.088-0.107-0.106-0.107
Percentage of DefinedBenefitPlanActuarialGainLoss26.126.330.030.030.039.337.737.739.437.337.138.638.438.8

cpk:ChesapeakePensionSerp


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-0.007-0.007-0.005-0.005-0.005-0.017-0.026-0.026-0.025-0.025-0.025-0.022-0.022-0.022
Percentage of DefinedBenefitPlanActuarialGainLoss3.03.12.32.32.36.69.79.712.010.610.57.98.08.0

cpk:ChesapeakePostretirementPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-0.01-0.008-0.012-0.012-0.012-0.011-0.012-0.012-0.015-0.015-0.015-0.017-0.017-0.016
Percentage of DefinedBenefitPlanActuarialGainLoss4.33.55.55.55.54.34.54.57.26.46.36.16.25.8

cpk:FloridaPublicUtilitiesCompanyPensionPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-0.155-0.155-0.135-0.135-0.135-0.128-0.129-0.129-0.086-0.108-0.109-0.131-0.131-0.131
Percentage of DefinedBenefitPlanActuarialGainLoss67.468.062.262.262.249.848.148.141.345.846.047.347.547.5

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-31
Value-19000.0-19000.0-19000.0-19000.0-19000.0-19000.0-19000.0-19000.0-19000.0-19000.0-19000.058000.0-19000.0-20000.0-19000.060000.0-20000.0-20000.0-20000.059000.0-17000.0-17000.0-17000.0-14000.0-15000.0-14000.0-14000.0-15000.0-14000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit us-gaap:RetirementPlanName

cpk:ChesapeakePostretirementPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-19000.0-19000.0-19000.0-19000.0-19000.0-19000.0-19000.0-19000.0-19000.0-19000.0-19000.0-19000.0-20000.0-19000.0
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanContributionsByEmployer us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanContributionsByEmployer

cpk:ChesapeakePensionPlan


Defined
Period End2021-06-302021-03-312020-09-302019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.10.10.11.00.0670.0330.2350.1260.072
Percentage of DefinedBenefitPlanContributionsByEmployer100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:ChesapeakePostretirementPlan


Defined
Period End2021-06-302021-03-312019-03-312018-09-302018-06-302018-03-31
Value0.00.20.001-0.0030.0070.012
Percentage of DefinedBenefitPlanContributionsByEmployer0.0200.03.0-1.35.616.7

cpk:FloridaPublicUtilitiesCompanyPensionPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value0.50.40.51.80.30.40.2330.1230.5390.309
Percentage of DefinedBenefitPlanContributionsByEmployer500.0400.0500.00.030.0597.0706.152.3427.8429.2

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

cpk:ChesapeakePensionPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value40000.040000.042000.042000.042000.0127000.0127000.0127000.0131000.0138000.0138000.0127000.0127000.0127000.0
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:FloridaPublicUtilitiesCompanyPensionPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value830000.0830000.0745000.0745000.0745000.0693000.0693000.0693000.0770000.0774000.0774000.0699000.0700000.0699000.0
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets2075.02075.01773.81773.81773.8545.7545.7545.7587.8560.9560.9550.4551.2550.4

us-gaap:DefinedBenefitPlanInterestCost us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanInterestCost

cpk:ChesapeakePensionPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value34000.034000.046000.046000.046000.0104000.0104000.0105000.094000.098000.097000.0103000.0103000.0103000.0
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:ChesapeakePensionSerp


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value12000.012000.016000.016000.016000.016000.021000.021000.021000.021000.021000.022000.022000.022000.0
Percentage of DefinedBenefitPlanInterestCost35.335.334.834.834.815.420.220.022.321.421.621.421.421.4

cpk:ChesapeakePostretirementPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value6000.06000.08000.08000.08000.010000.09000.010000.010000.09000.010000.011000.011000.010000.0
Percentage of DefinedBenefitPlanInterestCost17.617.617.417.417.49.68.79.510.69.210.310.710.79.7

cpk:FloridaPublicUtilitiesCompanyMedicalPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value6000.06000.010000.010000.010000.012000.012000.012000.012000.013000.012000.013000.013000.013000.0
Percentage of DefinedBenefitPlanInterestCost17.617.621.721.721.711.511.511.412.813.312.412.612.612.6

cpk:FloridaPublicUtilitiesCompanyPensionPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value429000.0429000.0518000.0518000.0518000.0614000.0615000.0615000.0570000.0592000.0592000.0623000.0624000.0623000.0
Percentage of DefinedBenefitPlanInterestCost1261.81261.81126.11126.11126.1590.4591.3585.7606.4604.1610.3604.9605.8604.9

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost us-gaap:RetirementPlanName

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

cpk:ChesapeakePensionPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value54000.054000.069000.069000.069000.078000.078000.079000.045000.048000.047000.083000.082000.083000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:ChesapeakePensionSerp


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value19000.019000.021000.021000.021000.033000.047000.047000.046000.046000.046000.044000.044000.044000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost35.235.230.430.430.442.360.359.5102.295.897.953.053.753.0

cpk:ChesapeakePostretirementPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-3000.0-5000.01000.01000.01000.02000.02000.03000.06000.05000.06000.09000.08000.07000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-5.6-9.31.41.41.42.62.63.813.310.412.810.89.88.4

cpk:FloridaPublicUtilitiesCompanyMedicalPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value4000.04000.010000.010000.010000.012000.012000.012000.012000.013000.012000.013000.013000.013000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost7.47.414.514.514.515.415.415.226.727.125.515.715.915.7

cpk:FloridaPublicUtilitiesCompanyPensionPlan


Defined
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-246000.0-246000.0-92000.0-92000.0-92000.049000.051000.051000.0-114000.0-74000.0-73000.055000.055000.055000.0
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost-455.6-455.6-133.3-133.3-133.362.865.464.6-253.3-154.2-155.366.367.166.3

us-gaap:DerivativeGainLossOnDerivativeNet

us-gaap:DerivativeGainLossOnDerivativeNet


Derivative
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value4804000.03253000.01209000.02552000.01236000.0767000.0-2810000.04198000.0637000.0985000.0-6119000.0-470000.0-224000.02291000.0167000.0876000.0-416000.08000.0112000.0580000.049000.090000.01178000.0599000.0407000.050000.0288000.0270000.0997000.0635000.0454000.0290000.0442000.0535000.0
Percentage of DerivativeGainLossOnDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeGainLossOnDerivativeNet us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

cpk:PropaneSwapAgreement, us-gaap:DesignatedAsHedgingInstrument, us-gaap:CostOfSales


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-30
Value455000.03047000.0847000.0116000.0238000.01227000.0372000.0290000.0252000.0606000.0274000.0-276000.0-181000.0-464000.0944000.0198000.077000.0388000.0000-364000.0-120000.00
Percentage of DerivativeGainLossOnDerivativeNet9.593.70.09.69.399.30.037.8-9.014.40.0-43.3-18.47.60.0-42.1-34.416.90.00.00.087.50.00.0

cpk:PutOrCallOption, us-gaap:DesignatedAsHedgingInstrument, us-gaap:CostOfSales


Derivative
Period End2021-06-302021-03-312018-12-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value0-24000.000000-9000.0-24000.000
Percentage of DerivativeGainLossOnDerivativeNet0.0-0.70.00.00.0-0.0-0.0-0.40.00.00.0

us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument, us-gaap:InterestExpense


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-06-30
Value22000.04000.015000.034000.011000.00
Percentage of DerivativeGainLossOnDerivativeNet0.50.10.02.80.4-0.0

us-gaap:DerivativeNonmonetaryNotionalAmountVolume dei:LegalEntity, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeNonmonetaryNotionalAmountVolume

cpk:SharpEnergyInc, us-gaap:Swap


Derivative
Period End2021-03-312020-12-312019-06-302019-03-312018-12-31
Value18-4.16.75.45.3
Percentage of DerivativeNonmonetaryNotionalAmountVolume100.0100.0100.0100.0100.0

us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax

us-gaap:DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax


Discontinued
Period End2020-12-312020-09-302020-06-302020-03-31
Value-7300000.07300000.0200000.07300000.0
Percentage of DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax100.0100.0100.0100.0

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax


Discontinued
Period End2020-12-312019-12-312019-09-302019-06-302019-03-31
Value-5230000.05402000.0000
Percentage of DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax100.0100.00.00.00.0

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare

us-gaap:DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare


Discontinued
Period End2020-12-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.040.02-0.011.04-0.04-0.04-0.010-0.040.04-0.02
Percentage of DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTaxPerDilutedShare100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax us-gaap:DisposalGroupClassification

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax

us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySale


Discontinued
Period End2020-09-302019-09-30
Value-26000.0-926000.0
Percentage of DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax100.0100.0

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax


Discontinued
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value-2000.0-6000.0-19000.0295000.0-96000.0-624000.0-610000.0-150000.0-552000.0
Percentage of DiscontinuedOperationIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare


Discontinued
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value0.0400.02-0.010.33-0.04-0.03-0.010-0.030.04-0.03
Percentage of DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare100.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare

us-gaap:DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare


Discontinued
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-30
Value0.0400.02-0.010.32-0.04-0.04-0.010-0.03
Percentage of DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare100.00.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:DiscontinuedOperationIntraEntityAmountsDiscontinuedOperationAfterDisposalRevenue us-gaap:StatementBusinessSegments

us-gaap:DiscontinuedOperationIntraEntityAmountsDiscontinuedOperationAfterDisposalRevenue

cpk:PESCO


Discontinued
Period End2020-12-312020-09-302020-06-30
Value0.74.34.9
Percentage of DiscontinuedOperationIntraEntityAmountsDiscontinuedOperationAfterDisposalRevenue100.0100.0100.0

us-gaap:DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation us-gaap:DisposalGroupClassification

us-gaap:DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation

us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySale


Discontinued
Period End2020-12-312020-09-302019-12-312019-09-30
Value-42000.07000.0852000.0296000.0
Percentage of DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation100.0100.0100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold us-gaap:DisposalGroupClassification

us-gaap:DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold

us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySale


Disposal
Period End2020-09-302019-12-312019-09-30
Value-0.048.18233
Percentage of DisposalGroupIncludingDiscontinuedOperationCostsOfGoodsSold100.0100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationInterestExpense us-gaap:DisposalGroupClassification

us-gaap:DisposalGroupIncludingDiscontinuedOperationInterestExpense

us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySale


Disposal
Period End2020-09-302019-12-312019-09-30
Value-6000.055000.074000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationInterestExpense100.0100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingExpense us-gaap:DisposalGroupClassification

us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingExpense

us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySale


Disposal
Period End2020-12-312020-09-302019-12-312019-09-30
Value-42000.075000.0402000.01360000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationOperatingExpense100.0100.0100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss us-gaap:DisposalGroupClassification

us-gaap:DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss

us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySale


Disposal
Period End2020-09-302019-09-30
Value-32000.0-852000.0
Percentage of DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss100.0100.0

us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue us-gaap:DisposalGroupClassification

us-gaap:DisposalGroupIncludingDiscontinuedOperationRevenue

us-gaap:DiscontinuedOperationsHeldForSaleOrDisposedOfBySale


Disposal
Period End2020-12-312020-09-302019-12-312019-09-30
Value0.00.0038.71634
Percentage of DisposalGroupIncludingDiscontinuedOperationRevenue0.0100.0100.0100.0

us-gaap:EmployeeBenefitsAndShareBasedCompensation

us-gaap:EmployeeBenefitsAndShareBasedCompensation


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-173000.0-173000.0175000.011000.010000.011000.0822000.0399000.0382000.0382000.0400000.00228000.0228000.0365000.0393000.0396000.0423000.0670000.0457000.0380000.0380000.0334000.0300000.0301000.0300000.0208000.0157000.0157000.0162000.0411000.0250000.0247000.0211000.0141000.0126000.0183000.0126000.0-116000.0-916000.0-135000.0444000.0-163000.0-211000.0
Percentage of EmployeeBenefitsAndShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense

us-gaap:EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value384000.0496000.0299000.0348000.0331000.0276000.0517000.0315000.0158000.0127000.076000.079000.0363000.0416000.0356000.0320000.070000.0257000.0192000.0251000.0248000.0261000.0198000.0201000.0165000.0217000.0178000.0183000.0172000.0257000.0155000.0155000.0186000.0153000.0123000.0166000.0-141000.0138000.0149000.0150000.0-151000.0
Percentage of EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EnvironmentalCostsRecognizedRecoveryCreditedToExpense dei:LegalEntity

us-gaap:EnvironmentalCostsRecognizedRecoveryCreditedToExpense

cpk:FloridaPublicUtilitiesCompany


Environmental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.1120.10.10.1120.10.10.111
Percentage of EnvironmentalCostsRecognizedRecoveryCreditedToExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EnvironmentalExitCostsReasonablyPossibleAdditionalLoss us-gaap:Range, us-gaap:StatementGeographical

us-gaap:EnvironmentalExitCostsReasonablyPossibleAdditionalLoss

srt:Maximum, cpk:Seaford


Environmental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.00.90.00.00.00.5-0.0350.00.0350.465
Percentage of EnvironmentalExitCostsReasonablyPossibleAdditionalLoss0.0100.00.00.00.0100.0100.00.0100.0100.0

srt:Maximum, cpk:WestPalmBeachFlorida


Environmental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.0140.00.0-1.2150.00.00.015
Percentage of EnvironmentalExitCostsReasonablyPossibleAdditionalLoss0.01577.80.00.00.03080.0-0.00.00.03311.8

srt:Minimum, cpk:Seaford


Environmental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.10.20.00.00.00.20.0730.0-0.0730.273
Percentage of EnvironmentalExitCostsReasonablyPossibleAdditionalLoss0.022.20.00.00.040.0-208.60.0-208.658.7

srt:Minimum, cpk:WestPalmBeachFlorida


Environmental
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value0.03.30.00.0-1.24.50.00.00.04.5
Percentage of EnvironmentalExitCostsReasonablyPossibleAdditionalLoss0.0366.70.00.00.0900.0-0.00.00.0967.7

us-gaap:EnvironmentalRemediationExpense us-gaap:Range, us-gaap:StatementGeographical

us-gaap:EnvironmentalRemediationExpense

srt:Maximum, cpk:WinterHavenFlorida


Environmental
Period End2021-06-302021-03-312020-12-312019-03-31
Value0400000.025000.0425000.0
Percentage of EnvironmentalRemediationExpense0.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value-8000.0-8000.045000.0-8000.0-6000.0-4000.026000.0-4000.0-4000.0-3000.019000.0-3000.0-3000.0-2000.068000.0-3000.0-2000.0-2000.02000.02000.02000.02000.02000.01000.01000.01000.02000.01000.02000.01000.03000.01000.02000.02000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements


Fair
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value48000.022000.018000.017000.0217000.09000.08000.013000.0104000.06000.0-105000.010000.0102000.0-48000.03000.011000.063000.02000.03000.08000.0110000.02000.080000.0-60000.054000.0-5000.0165000.0-63000.068000.0-94000.0-57000.02000.0109000.0-13000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchasesSalesIssuancesSettlements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales


Fair
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302015-09-30
Value13000.038000.0464000.012000.038000.015000.02000.012000.0029000.0012000.002000.00000
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.00.0100.00.00.00.00.0

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3

us-gaap:FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3


Fair
Period End2020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value234000.01288000.057000.0000-5000.0-53000.000063000.00330000.0-242000.079000.0003000.0195000.033000.025000.0000016000.0
Percentage of FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3100.0100.0100.00.00.00.0100.0100.00.00.00.0100.00.0100.0100.0100.00.00.0100.0100.0100.0100.00.00.00.00.0100.0

us-gaap:GainLossOnDispositionOfAssets

us-gaap:GainLossOnDispositionOfAssets


Gain
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-07-312011-06-302011-03-312010-12-312010-09-30
Value1828000.03514000.01380000.0-962000.04458000.0515000.0209000.0363000.0-158000.0-441000.0-3416000.05040000.0-893000.0-1330000.01069000.0-185000.0-479000.0-275000.0-154000.0840000.016000.0412000.08000.010000.0103000.031000.08000.0-75000.015000.0-69000.036000.04000.0543000.0553000.0-37000.0-57000.0-76000.034000.0
Percentage of GainLossOnDispositionOfAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity

us-gaap:IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity


Income
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value691000.0-19000.0125000.0-111000.0-9000.0-624000.0-609000.0-149000.05000.0-552000.0680000.0-415000.0
Percentage of IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities

us-gaap:IncreaseDecreaseInAccountsPayableAndAccruedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value5.7970.7665.8650.682.639-4.243-10.4715.352-12.119-44.78345160.78-26.932114.7955.617-5.897157.748-2.465-1.604-5.7523.845-11.3662.376103.787-27.3124.821100.16.5641.510.202-1.779-10.22-8.13912-26.45711-11.041290.819
Percentage of IncreaseDecreaseInAccountsPayableAndAccruedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInContractWithCustomerLiability

us-gaap:IncreaseDecreaseInContractWithCustomerLiability


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1528000.0-847000.0666000.01804000.01585000.0-1817000.01181000.01324000.0129000.0-4445000.0
Percentage of IncreaseDecreaseInContractWithCustomerLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities

us-gaap:IncreaseDecreaseInEmployeeRelatedLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1708000.0-5105000.03033000.01580000.01680000.0-8766000.05867000.01618000.0183000.0-5548000.03512000.02392000.02535000.0-7731000.04518000.01846000.01090000.0-4966000.02651000.01047000.02603000.0-5943000.01075000.02382000.01474000.0-5262000.01279000.01733000.0530000.0-3505000.01897000.01000000.0693000.0-2753000.0991000.01299000.0452000.0-2305000.01239000.01014000.0-225000.0-2009000.0604000.0652000.0
Percentage of IncreaseDecreaseInEmployeeRelatedLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInIncomeTaxesReceivable

us-gaap:IncreaseDecreaseInIncomeTaxesReceivable


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1.579-6.093-13.9745.3296.3-4.828.950.1161.925-6.2416.5752.3050.383-8.741-11.92121.0-9.5125.783-11.839-8.841194.4172.453-21.753162.7958.26-11.5651.6692.6192.3-8.899-3.2331.930.478-1.398-2.8270.3982.3960.27-2.6318.593
Percentage of IncreaseDecreaseInIncomeTaxesReceivable100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherCurrentLiabilities

us-gaap:IncreaseDecreaseInOtherCurrentLiabilities


Increase
Period End2021-06-302021-03-312020-12-31
Value-91000.0-211000.0-327000.0
Percentage of IncreaseDecreaseInOtherCurrentLiabilities100.0100.0100.0

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets

us-gaap:IncreaseDecreaseInOtherNoncurrentAssets


Increase
Period End2021-06-302021-03-312020-12-31
Value145000.0218000.0279000.0
Percentage of IncreaseDecreaseInOtherNoncurrentAssets100.0100.0100.0

us-gaap:IncreaseDecreaseInOutstandingChecksFinancingActivities

us-gaap:IncreaseDecreaseInOutstandingChecksFinancingActivities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-1108000.07000.01485000.01121000.01296000.0-4727000.01681000.0-3403000.0464000.084000.0-6655000.080000.0-1720000.02352000.04751000.0-643000.0-2957000.0587000.01454000.0993000.02974000.0-1501000.0-514000.0597000.04558000.0-2191000.0-418000.0303000.0-305000.0-501000.01026000.0-1452000.0-1323000.083000.04778000.0-2037000.0-594000.0-1550000.0-988000.04272000.0-402000.0-2791000.0-3765000.07854000.0
Percentage of IncreaseDecreaseInOutstandingChecksFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets

us-gaap:IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value1.382-4.171-1.2894.881-2.657-3.3592.844-4.2992.213-11.8735.88813-3.428-8.0954.1414.989-0.993-1.1361.8722.393-1.52-1.3580.63.42-0.761-2.5-0.1053.987-0.998-2.185-0.2973.673-0.843-1.469-0.1432.94-0.632-1.452-0.3992.536-0.264-1.528-0.5362.918
Percentage of IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncreaseDecreaseInReceivables

us-gaap:IncreaseDecreaseInReceivables


Increase
Period End2021-06-302021-03-312020-12-31
Value-19236000.0977000.018410000.0
Percentage of IncreaseDecreaseInReceivables100.0100.0100.0

us-gaap:IncreaseDecreaseInRegulatoryAssetsAndLiabilities

us-gaap:IncreaseDecreaseInRegulatoryAssetsAndLiabilities


Increase
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value6.412-14.1232.6896.4173.176-7.3090.6525.554.731-3.1211.6497.1360.476-11.5113.7823.3281.848-6.1034.1973.8453.422-3.9412.5846.2613.457-16.1852.1495.7183.347-0.2
Percentage of IncreaseDecreaseInRegulatoryAssetsAndLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements


Incremental
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value0.0020620.0010110.0551130.0570540.0024580.0500910.0447150.0479250.0006070.0498940.0474410.0516470.002140.0451930.0415420.0465720.0015290.040370.0376820.045070.0008780.0480240.0447970.0514690.0053470.0419870.0336910.0350030.0013560.0261230.0224540.023132-22.660501230.032380.029931-22.599208230.020699
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LeaseCost

us-gaap:LeaseCost


Lease
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value147000.0627000.0629000.0626000.0651000.0638000.0904000.01040000.0854000.01430000.01073000.01482000.0
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:NotionalAmountOfNonderivativeInstruments

us-gaap:NotionalAmountOfNonderivativeInstruments


Notional
Period End2021-06-302021-02-282021-03-312020-12-312020-09-30
Value10040100600.0
Percentage of NotionalAmountOfNonderivativeInstruments100.0100.0100.0100.00.0

us-gaap:NotionalAmountOfNonderivativeInstruments us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Notional
Period End2021-02-28
Value40
Percentage of NotionalAmountOfNonderivativeInstruments100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value515000.0523000.0147000.0627000.0629000.0626000.0651000.0638000.0654000.0635000.0479000.01055000.0698000.01107000.0
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value465000.0471000.0521000.0401000.0507000.0527000.0650000.0480000.0563000.0537000.0487000.0557000.0697000.01018000.0
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value19000.019000.020000.019000.019000.019000.019000.019000.019000.019000.019000.019000.019000.019000.019000.019000.020000.019000.017000.020000.020000.020000.018000.017000.017000.017000.014000.015000.0-67000.014000.015000.015000.0-107000.014000.0
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-14000.0-14000.0-17000.0-14000.0-14000.0-14000.0-14000.0-14000.0-14000.0-14000.0-13000.0-14000.0-14000.0-14000.0-11000.0-11000.0-12000.0-11000.0-11000.0-12000.0-12000.0-12000.0-10000.0-10000.0-10000.0-10000.0-8000.0-9000.0-9000.0-9000.0-63000.09000.0-9000.0-9000.0-65000.09000.0
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax

us-gaap:OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-30
Value-5000.0-5000.0-3000.0-5000.0-5000.0-5000.0-5000.0-5000.0-5000.0-5000.0-6000.0-5000.0-5000.0-5000.0-8000.0-8000.0-8000.0-8000.0-6000.0-8000.0-8000.0-8000.0-7000.0-7000.0-7000.0-7000.0-6000.0-6000.0-6000.0-6000.0-6000.0-6000.06000.0-6000.06000.0
Percentage of OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-03-31
Value3476000.02372000.01221000.0876000.01846000.0895000.0-411000.0700000.0-2021000.03021000.0-2606000.0314000.0792000.0-2232000.0127000.0-515000.0-441000.01269000.0-133000.0116000.0808000.0-283000.0-560000.0-75000.06000.0-7000.0-3696000.0-27000.0-1000.002257000.00-6000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0

us-gaap:OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax us-gaap:StatementEquityComponents

cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value3454000.02371000.01806000.0824000.01875000.0895000.0381000.0780000.0-2021000.03021000.0-2004000.0314000.0792000.0-2232000.0-163000.0-515000.0-441000.01278000.0121000.0116000.0808000.0-283000.0-274000.0-75000.06000.0-7000.0-454000.0-27000.0-1000.00
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax99.4100.0147.994.1101.6100.0-92.7111.4100.0100.076.9100.0100.0100.0-128.3100.0100.0100.7-91.0100.0100.0100.048.9100.0100.0100.012.3100.0100.00.0

cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges


Other
Period End2021-06-302021-03-312020-09-30
Value22000.01000.052000.0
Percentage of OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax0.60.05.9

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent

us-gaap:OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value6000.0-2000.0-18000.027000.0-37000.0
Percentage of OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax us-gaap:DerivativeInstrumentRisk, us-gaap:HedgingDesignation, us-gaap:IncomeStatementLocation

us-gaap:OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax

cpk:PropaneSwapAgreement, us-gaap:DesignatedAsHedgingInstrument, us-gaap:OtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-30
Value4319000.0229000.01022000.02354000.09000.0-1139000.0-494000.01009000.0296000.0106000.0-992000.01590000.0-218000.0-557000.0213000.0
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestRateSwap, us-gaap:DesignatedAsHedgingInstrument, us-gaap:OtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302019-06-30
Value8000.0-3000.037000.0-51000.00
Percentage of OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax0.2-1.33.6-2.2-0.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-31
Value3196000.0227000.0764000.0833000.01732000.073000.0-944000.0424000.0-2008000.03089000.0-1726000.0730000.01155000.0-1694000.0987000.0-13000.0-786000.0420000.0151000.0139000.0583000.089000.0-369000.08000.089000.0108000.0-3207000.03000.030000.031000.02370000.055000.055000.049000.0-735000.067000.067000.067000.0-1710000.0182000.044000.0317000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value3196000.0227000.0764000.0833000.01732000.073000.0-864000.0344000.0-2008000.03089000.0-1726000.0730000.01155000.0-1694000.0987000.0-15000.0-786000.0420000.0151000.0139000.0583000.089000.0-369000.08000.089000.0108000.0-3207000.04000.029000.031000.02370000.055000.055000.049000.0-735000.067000.066000.067000.0
Percentage of OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.091.581.1100.0100.0100.0100.0100.0100.0100.0115.4100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0133.396.7100.0100.0100.0100.0100.0100.0100.098.5100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value0.0870.085230.0890.0890.089210.1340.1440.144220.1190.130.13210.1520.150.151240.1460.1460.148250.1380.1380.137250.0510.0520.0528.1140.0920.092-0.092
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax us-gaap:RetirementPlanName

cpk:ChesapeakePensionPlan


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value0.060.060.0650.0650.0650.1010.1010.1010.0820.0880.0880.1070.1060.107
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax69.070.673.073.073.075.470.170.168.967.767.770.470.770.9

cpk:ChesapeakePensionSerp


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value0.0070.0070.0050.0050.0050.0170.0260.0260.0250.0250.0250.0220.0220.022
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax8.08.25.65.65.612.718.118.121.019.219.214.514.714.6

cpk:ChesapeakePostretirementPlan


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value-0.009-0.011-0.007-0.007-0.007-0.008-0.007-0.007-0.004-0.004-0.004-0.002-0.003-0.003
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax-10.3-12.9-7.9-7.9-7.9-6.0-4.9-4.9-3.4-3.1-3.1-1.3-2.0-2.0

cpk:FloridaPublicUtilitiesCompanyPensionPlan


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-31
Value0.0290.0290.0260.0260.0260.0240.0240.0240.0160.0210.0210.0250.0250.025
Percentage of OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeTax33.334.129.229.229.217.916.716.713.416.216.216.416.716.6

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:StatementEquityComponents

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax

us-gaap:ReclassificationOutOfAccumulatedOtherComprehensiveIncome, us-gaap:AccumulatedDefinedBenefitPlansAdjustment


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value106000.0104000.0269000.0108000.0108000.0108000.02120000.0153000.0163000.0163000.0144000.0138000.0149000.0149000.0127000.0171000.0170000.0170000.0-371000.0-166000.0-166000.0-168000.0-185000.0-155000.0-155000.0-154000.0-81000.0-66000.015000.0-66000.0-203000.0-107000.015000.0-106000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value-78000.0-77000.0394000.0-80000.0-80000.0-80000.0-697000.0-114000.0-121000.0-121000.0425000.0-100000.0-108000.0-108000.0-366000.0-102000.0-101000.0-93000.032000.0-100000.0-99000.0-101000.0175000.0-93000.0-93000.0-92000.03194000.0-39000.0-40000.0-40000.0-2751000.064000.0-64000.0-58000.0270000.076000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax

us-gaap:OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-06-30
Value-28000.0-27000.0124000.0-28000.0-28000.0-28000.0-243000.0-39000.0-42000.0-42000.0167000.0-38000.0-41000.0-41000.0-220000.0-69000.0-69000.0-77000.022000.0-66000.0-67000.0-67000.0114000.0-62000.0-62000.0-62000.02077000.0-27000.027000.0-27000.01797000.0-43000.0-43000.0-38000.0-51000.0
Percentage of OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value3126000.0166000.01193000.0740000.01703000.07000.0-1627000.0324000.0-2115000.02982000.0-1288000.0644000.01061000.0-1788000.0632000.0-104000.0-875000.0338000.0194000.051000.0496000.00-184000.0-75000.06000.026000.0-5000.0-27000.0-1000.00
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax

us-gaap:OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value1193000.063000.0457000.0282000.0651000.02000.0-672000.0152000.0-850000.01194000.0-485000.0257000.0429000.0-756000.0368000.0-15000.0-554000.0192000.0136000.038000.0313000.00-121000.0-51000.04000.017000.0-14000.0-18000.0-1000.00
Percentage of OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-31
Value01478000.0000977000.0000692000.000491000.0719000.0000692000.0000770000.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation0.0100.00.00.00.0100.00.00.00.0100.00.00.0100.0100.00.00.00.0100.00.00.00.0100.0

us-gaap:PaymentsRelatedToTaxWithholdingForShareBasedCompensation us-gaap:PlanName

cpk:Awardtokeyemployees


Payments
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value01500000.0001000000.008000.0692000.000719000.0
Percentage of PaymentsRelatedToTaxWithholdingForShareBasedCompensation0.0101.50.00.0102.40.00.0100.00.00.0100.0

us-gaap:PaymentsToAcquireBusinessesGross

us-gaap:PaymentsToAcquireBusinessesGross


Payments
Period End2020-12-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-01-31
Value6.6020.00.00.00.039-38.908172.4370.2480.954
Percentage of PaymentsToAcquireBusinessesGross100.00.00.00.00.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan

us-gaap:ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan


Proceeds
Period End2021-06-302021-05-042021-03-312020-12-312020-09-30
Value2.61.01.9229.0
Percentage of ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Proceeds
Period End2020-10-31
Value13
Percentage of ProceedsFromIssuanceOfCommonStockDividendReinvestmentPlan0.0

us-gaap:ProceedsFromIssuanceOrSaleOfEquity

us-gaap:ProceedsFromIssuanceOrSaleOfEquity


Proceeds
Period End2021-06-302021-03-312020-09-302020-06-302020-03-31
Value2.7462.053190.1670.192
Percentage of ProceedsFromIssuanceOrSaleOfEquity100.0100.0100.0100.0100.0

us-gaap:ProceedsFromRepaymentsOfLinesOfCredit

us-gaap:ProceedsFromRepaymentsOfLinesOfCredit


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-30
Value14-19.528-42.252-71.704301120-73.07924-18.14932327.9-24.2134358-50.785-11.12553-26.5454.3270.839463123-19.2691722-35.294-21.696131729-13.6472816
Percentage of ProceedsFromRepaymentsOfLinesOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfProductiveAssets

us-gaap:ProceedsFromSaleOfProductiveAssets


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.1030.3943.760.0470.1674.1060.10.120.0920.1150.2170.2420.130.1930.1070.4160.1490.0360.0550.030.0380.0510.0550.06-0.1490.198100.0460.430.0290.0450.1090.0110.034-0.0020.0320.0792.170.0320.5610.0450.2990.0230.056
Percentage of ProceedsFromSaleOfProductiveAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvisionForOtherCreditLosses

us-gaap:ProvisionForOtherCreditLosses


Provision
Period End2020-12-31
Value1017000.0
Percentage of ProvisionForOtherCreditLosses100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-31
Value280000.02145000.0457000.043000.0114000.0822000.0453000.0356000.0-13000.0-68000.0-880000.0-417000.0-363000.0-538000.0-860000.0-500000.0345000.0849000.0-284000.0-23000.0225000.0-372000.0-191000.0-83000.0-83000.0-115000.0-673000.031000.092000.0-31000.0-113000.0-55000.0165000.0-55000.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax us-gaap:StatementEquityComponents

cpk:AOCIChangesForDefinedBenefitPensionAndPostretirementPlans


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-31
Value-65000.0-63000.0-167000.0-66000.0-66000.0-66000.0-1555000.0-99000.0-106000.0-107000.0-86000.0-95000.0-94000.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax-23.2-2.9-36.5-153.5-57.9-8.0-343.3-27.8815.4157.420.626.217.5

cpk:AccumulatedGainLossfromCommodityContractsCashFlowsHedges


Reclassification
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value329000.02205000.0613000.084000.0172000.0888000.02008000.0455000.093000.039000.0-716000.0-331000.0-268000.0-444000.0-795000.0-409000.0434000.0940000.0-73000.064000.0-254000.0283000.0-90000.000-33000.0-449000.0000
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax117.5102.8134.1195.3150.9108.0443.3127.8-715.4-57.481.479.473.882.592.481.8125.8110.725.7-278.3-112.9-76.147.1-0.0-0.028.766.70.00.0-0.0

cpk:AccumulatedGainLossfromInterestRateSwapCashFlowsHedges


Reclassification
Period End2021-06-302021-03-312020-09-30
Value16000.03000.025000.0
Percentage of ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax5.70.158.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue

cpk:Awardstononemployeedirector


Share
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value00095.8320.130075.7
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.00.00.0100.0100.00.00.0100.0

cpk:Awardstononemployeedirectors


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302016-12-312016-09-302015-12-312015-09-30
Value32.6484.4700-8.6793.14000000
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.00.00.00.00.097.20.00.00.00.00.00.0

cpk:Awardtokeyemployees


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312016-12-312016-09-302015-12-312015-09-30
Value0102.73-0.890092.7892646.03.15091.1900-0.560
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue0.00.00.00.00.096.8460236.80.00.0120.50.00.00.00.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue us-gaap:PlanName

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

cpk:Awardtokeyemployees


Share
Period End2021-06-302021-03-312020-12-312018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-312014-09-30
Value076.310000000000-13.43
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue0.0100.00.00.00.00.00.00.00.00.00.00.0100.0

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation


Shares
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value014020.000010319.0006482.07635.0-6482.006482.010436.000010269.000012031.000012620.004229.008458.0
Percentage of SharesPaidForTaxWithholdingForShareBasedCompensation0.0100.00.00.00.0100.00.00.0100.0100.0100.00.0100.0100.00.00.00.0100.00.00.00.0100.00.00.00.0100.00.0100.00.0100.0

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation us-gaap:AwardType

cpk:AcceleratedVestedShares


Shares
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value014020.00010319.0007635.00
Percentage of SharesPaidForTaxWithholdingForShareBasedCompensation0.0100.00.00.0100.00.00.0100.00.0

us-gaap:StockIssuedDuringPeriodSharesDividendReinvestmentPlan

us-gaap:StockIssuedDuringPeriodSharesDividendReinvestmentPlan


Stock
Period End2021-06-302021-05-042021-03-312020-12-312020-09-30
Value0100000.0100000.0300000.0100000.0
Percentage of StockIssuedDuringPeriodSharesDividendReinvestmentPlan0.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesDividendReinvestmentPlan us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Stock
Period End2020-10-31
Value100000.0
Percentage of StockIssuedDuringPeriodSharesDividendReinvestmentPlan0.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value0.006830.0391410.00.008870.0255860.00.00.0067590.0184720.00.00.0147530.019350.00.00.0075150.0226570.00.00.0085770.0275220.00.00.0144840.0312190.0005280.0133860.0088660.0179060.00.00.0094270.013921-19.197783190.01080.0084170.00.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.00.00.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:StockIssuedDuringPeriodValueDividendReinvestmentPlan

us-gaap:StockIssuedDuringPeriodValueDividendReinvestmentPlan


Stock
Period End2021-06-302021-05-042021-03-312020-12-312020-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-06-302016-03-312015-06-302015-03-312014-12-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value4.46115.35109.0586.1284.9-1000.0-1000.0-1000.00-1000.0-1000.0-1000.00-4319000.0-4057000.04360000.0-3588000.0-4755000.0-14753000.0-2000.0-5000.02000.0-12000.09000.0-1000.0-3000.0-6000.0-5000.0
Percentage of StockIssuedDuringPeriodValueDividendReinvestmentPlan100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueDividendReinvestmentPlan us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Stock
Period End2020-10-31
Value86.99
Percentage of StockIssuedDuringPeriodValueDividendReinvestmentPlan0.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value2046000.0208000.0987000.01144000.01834000.0-72000.01817000.01052000.01083000.0-334000.0143000.0153000.01238000.0666000.0749000.0661000.0576000.0-188000.0346000.0487000.01009000.0-285000.0625000.0333000.0909000.0-205000.0717000.0316000.0845000.011000.0465000.0272000.0843000.0-258000.0277000.0304000.0604000.0-174000.0261000.0262000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value2043000.0189000.0986000.01144000.01830000.0-84000.01817000.01052000.01079000.0-343000.0143000.0153000.01231000.0657000.0749000.0661000.0572000.0-199000.0345000.0487000.01005000.0-299000.0625000.0333000.0902000.0-220000.0717000.0316000.0841000.02000.0464000.0272000.0839000.0-265000.0277000.0303000.0599000.0-178000.0261000.0262000.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation99.990.999.9100.099.8116.7100.0100.099.6102.7100.0100.099.498.6100.0100.099.3105.999.7100.099.6104.9100.0100.099.2107.3100.0100.099.518.299.8100.099.5102.7100.099.799.2102.3100.0100.0

us-gaap:CommonStock


Stock
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value3000.019000.01000.004000.012000.0004000.09000.0007000.09000.0004000.011000.01000.004000.014000.0007000.015000.0004000.09000.01000.004000.07000.001000.05000.04000.000
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation0.19.10.10.00.2-16.70.00.00.4-2.70.00.00.61.40.00.00.7-5.90.30.00.4-4.90.00.00.8-7.30.00.00.581.80.20.00.5-2.70.00.30.8-2.30.00.0

us-gaap:TaxesOther

us-gaap:TaxesOther


Taxes
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value5.8756.4495.885.1335.2475.6494.7195.1784.8995.5054.9094.424.4044.8944.5134.0713.9714.534.0053.4883.393.8463.6073.2573.1563.5873.3973.1513.1183.6733.4283.7193.4873.1782.4352.5352.3342.8842.2382.3322.5232.9193.1882.4792.431
Percentage of TaxesOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:TradingSecuritiesUnrealizedHoldingGainLoss

us-gaap:TradingSecuritiesUnrealizedHoldingGainLoss


Trading
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-30
Value600000.0400000.01100000.0600000.01400000.0-1500000.0600000.0-100000.0400000.0727000.0-854000.0313000.0158000.0-44000.0306000.0261000.0181000.0252000.0133000.0193000.071000.0-18000.0138000.0-238000.04000.0-104000.0126000.0-41000.0114000.037000.0706000.0-259000.0-241000.0283000.050000.0102000.0185000.0317000.0231000.080000.0
Percentage of TradingSecuritiesUnrealizedHoldingGainLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrealizedGainLossOnCommodityContracts

us-gaap:UnrealizedGainLossOnCommodityContracts


Unrealized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value599000.0389000.01050000.0562000.01381000.0-1511000.0570000.0-64000.0368000.0721000.0-856000.0313000.0158000.0-44000.0306000.0879000.0-52000.0-132000.0142000.0201000.060000.0-18000.0-36000.0-247000.0208000.0-21000.0-434000.0-5000.06000.0-68000.0-60000.0124000.0-61000.0214000.0-192000.085000.0-172000.0-60000.08000.063000.0-113000.083000.0-327000.069000.0
Percentage of UnrealizedGainLossOnCommodityContracts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:AccountsReceivableAllowanceForCreditLossesCurrentDisclosure

cpk:AccountsReceivableAllowanceForCreditLossesCurrentDisclosure


Accounts
Period End2020-12-312019-12-31
Value4785000.01337000.0
Percentage of AccountsReceivableAllowanceForCreditLossesCurrentDisclosure100.0100.0

cpk:AccountsReceivableAllowanceforCreditLossesCurrentDisclosure

cpk:AccountsReceivableAllowanceforCreditLossesCurrentDisclosure


Accounts
Period End2020-09-302020-06-302020-03-312019-12-31
Value4130000.02104000.01421000.01337000.0
Percentage of AccountsReceivableAllowanceforCreditLossesCurrentDisclosure100.0100.0100.0100.0

cpk:AccruedRevenue

cpk:AccruedRevenue


Accrued
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-31
Value132021111216201112202712121822141116169.5068.65812128.7978.09112137.6297.63112137.9487.18811118.3948.3038.29108.4348.65514
Percentage of AccruedRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

cpk:AccumulatedOtherComprehensiveIncomeLossTaxEffect

cpk:AccumulatedOtherComprehensiveIncomeLossTaxEffect


Accumulated
Period End2020-12-31
Value1800000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossTaxEffect100.0

cpk:BusinessAcquisitionPremiumPaid dei:LegalEntity

cpk:BusinessAcquisitionPremiumPaid

cpk:IndiantownGasCompany


Business
Period End2020-12-312019-12-312018