SM


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

Table of contents



us-gaap:CommonStockValue
us-gaap:StatementEquityComponents
us-gaap:CommonStockSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted
us-gaap:AwardType
us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization

us-gaap:CostsAndExpenses

us-gaap:GainsLossesOnExtinguishmentOfDebt
us-gaap:DebtInstrument

us-gaap:GeneralAndAdministrativeExpense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:InterestExpense
us-gaap:DebtInstrument
us-gaap:InterestExpenseDebt

us-gaap:InterestPaidNet

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:OperatingIncomeLoss

us-gaap:OtherComprehensiveIncomeLossNetOfTax
us-gaap:StatementEquityComponents

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:ProductOrService
us-gaap:ProductOrService, us-gaap:StatementGeographical
us-gaap:StatementGeographical

us-gaap:Revenues

us-gaap:Assets

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:AccountsReceivableNetCurrent
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OtherAssetsNoncurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:LiabilitiesCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent
us-gaap:IncomeTaxAuthority
us-gaap:TaxesPayableCurrent

us-gaap:LiabilitiesNoncurrent

us-gaap:LongTermDebt

us-gaap:LongTermDebtNoncurrent
us-gaap:DebtInstrument

us-gaap:UnsecuredLongTermDebt
us-gaap:DebtInstrument

us-gaap:SecuredLongTermDebt
us-gaap:DebtInstrument

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

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:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetIncomeLoss
us-gaap:StatementEquityComponents

us-gaap:ShareBasedCompensation

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:PaymentsOfDividendsCommonStock
us-gaap:DebtInstrument
us-gaap:DebtInstrumentInterestRateStatedPercentage

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsValuationAllowance

sm:CashPortionOfGainLossOnDerivativeInstrument

sm:ChangeInCapitalExpendituresIncurredButNotYetPaid
us-gaap:DebtInstrument
sm:DebtInstrumentRepurchaseDiscount
us-gaap:DebtInstrument
sm:DebtInstrumentRepurchasePremium

sm:Derivativesettlementgainorloss
us-gaap:DerivativeInstrumentRisk
us-gaap:DebtInstrument, us-gaap:ExtinguishmentOfDebt
sm:GainsLossesonExtinguishmentofDebtNonCashPortion

sm:ImpairmentofProvedOilandGasProperties

sm:ImpairmentofUnprovedOilandGasProperties
us-gaap:CreditFacility, us-gaap:LongtermDebtType
sm:LetterofCreditDividendRestrictionsAmount

sm:NonmonetaryTradeAcreageExchanged
us-gaap:AwardType, us-gaap:SubsequentEventType
sm:RestrictedStockSharesSettledGrossOfSharesForTaxWithholdings
us-gaap:StatementEquityComponents
sm:StockIssuedDuringPeriodSharesRestrictedStockUnitsAndPerformanceShareUnits

sm:StockIssuedDuringPeriodValueRestrictedStockUnitsAndPerformanceShareUnits
us-gaap:StatementEquityComponents

us-gaap:AdjustmentsToAdditionalPaidInCapitalOther
us-gaap:StatementEquityComponents

us-gaap:AmortizationOfFinancingCostsAndDiscounts

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:CommonStockDividendsPerShareDeclared
us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType
us-gaap:ConcentrationRiskPercentage1
us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:CurrentStateAndLocalTaxExpenseBenefit
sm:DebtInstrumentBorrowingBaseUtilizationPercentage, us-gaap:CreditFacility, us-gaap:LongtermDebtType, us-gaap:VariableRate
us-gaap:DebtInstrumentBasisSpreadOnVariableRate1
sm:DebtInstrumentBorrowingBaseUtilizationPercentage, us-gaap:LongtermDebtType, us-gaap:VariableRate
us-gaap:DebtInstrument
us-gaap:DebtInstrumentConvertibleConversionRatio1

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit
us-gaap:SubsequentEventType
us-gaap:DefinedBenefitPlanContributionsByEmployer

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:DefinedBenefitPlanServiceCost
sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeNonmonetaryNotionalAmountEnergyMeasure
sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

us-gaap:DividendsCommonStockCash
us-gaap:StatementEquityComponents

us-gaap:EarlyRepaymentOfSeniorDebt

us-gaap:ExplorationExpense

us-gaap:GainLossOnDerivativeInstrumentsNetPretax
us-gaap:DerivativeInstrumentRisk

us-gaap:GainLossOnSaleOfOilAndGasProperty

us-gaap:ImpairmentOfOilAndGasProperties

us-gaap:IncreaseDecreaseInOperatingCapital

us-gaap:InterestCostsCapitalized

us-gaap:LeaseCost
sm:DebtInstrumentBorrowingBaseUtilizationPercentage, us-gaap:CreditFacility, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
sm:DebtInstrumentBorrowingBaseUtilizationPercentage, us-gaap:LongtermDebtType

us-gaap:NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePaymentsUse

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherOperatingIncome

us-gaap:OtherOperatingIncomeExpenseNet

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsToAcquireOilAndGasPropertyAndEquipment

us-gaap:PaymentsToExploreAndDevelopOilAndGasProperties
us-gaap:DebtInstrument
us-gaap:ProceedsFromDebtNetOfIssuanceCosts

us-gaap:ProceedsFromIncomeTaxRefunds

us-gaap:ProceedsFromIssuanceOfCommonStock
us-gaap:PlanName
us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans

us-gaap:ProceedsFromLinesOfCredit

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromSaleOfOilAndGasPropertyAndEquipment
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:RepaymentsOfConvertibleDebt

us-gaap:RepaymentsOfLinesOfCredit
us-gaap:SubsequentEventType
us-gaap:RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings

us-gaap:ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
us-gaap:AwardType, us-gaap:SubsequentEventType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
us-gaap:PlanName
us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
us-gaap:AwardType
us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation
us-gaap:AwardType, us-gaap:SubsequentEventType

us-gaap:ShortTermLeaseCost
us-gaap:PlanName
us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesOther
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation
us-gaap:TitleOfIndividual
us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationGross

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodValueOther

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation
us-gaap:StatementEquityComponents

us-gaap:VariableLeaseCost
us-gaap:DebtInstrument, us-gaap:ExtinguishmentOfDebt
us-gaap:WriteOffOfDeferredDebtIssuanceCost

dei:EntityCommonStockSharesOutstanding

sm:AccruedRevenueAndSeveranceTaxPayable

sm:DeferredTaxAssetsDebtDiscountAndDeferredFinancingCosts

sm:DefinedBenefitPlanAccumulatedUnfundedBenefitObligation
us-gaap:DerivativeInstrumentRisk
sm:DerivativeCalendarMonthAverageRollDifferentialSwapTypeWeightedAverageContractPrice
sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk
sm:DerivativeOilBasisSwapTypeWeightedAverageContractPrice
sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType
sm:DerivativeUnderlyingIndex, us-gaap:SubsequentEventType
us-gaap:DerivativeInstrumentRisk
sm:DerivativeOilRollDifferentialSwapTypeWeightedAverageContractPrice
us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

sm:DerivativeSettlementPayable
us-gaap:OtherCommitments
sm:EarlyTerminationPenaltyforRigContractCancellation
us-gaap:OtherCommitments, us-gaap:SubsequentEventType
us-gaap:Range, us-gaap:FairValueByLiabilityClass, us-gaap:MeasurementInputType
sm:FairValueAssumptionsMeasurementInput
us-gaap:Range, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType, us-gaap:PropertyPlantAndEquipmentByType

sm:IncomeTaxesRefundAlternativeMinimumTaxCARESAct
sm:DerivativeUnderlyingIndex
sm:IndexPercentOfNaturalGasFixedSwaps
us-gaap:CreditFacility, us-gaap:LongtermDebtType
sm:LineofCreditFacilityAggregateLenderCommitments
us-gaap:CreditFacility, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

sm:LongTermLineOfCreditAndSeniorNotesNoncurrent
us-gaap:AwardType
sm:MultiplierAppliedToPsuAwardsAtSettlement

sm:PermittedSecondLienDebtRemainingBorrowingCapacity
us-gaap:Range, us-gaap:OtherCommitments
sm:PotentialPenaltyfornotMeetingMinimumCompletionServiceArrangementRequirements
us-gaap:Range
sm:PotentialPenaltyfornotMeetingMinimumDrillingandCompletionRequirements

sm:RevolvingCreditFacilityAndSeniorNotesNet
us-gaap:PlanName
sm:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionValue

sm:WarrantsExercised
us-gaap:SubsequentEventType
us-gaap:OtherCommitments
sm:WaterDeliveryCommitmentsandContractsRemainingContractualVolume

sm:WellsInProgress
us-gaap:OilAndGasDeliveryCommitmentsAndContracts
srt:OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
us-gaap:AccountsReceivableGrossCurrent

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AssetRetirementObligation

us-gaap:AssetRetirementObligationCurrent

us-gaap:AssetRetirementObligationsNoncurrent

us-gaap:AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment

us-gaap:CapitalizedExploratoryWellCosts

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:ContractualObligation
us-gaap:OtherCommitments
us-gaap:OtherCommitments, us-gaap:SubsequentEventType

us-gaap:ContractualObligationDueAfterFifthYear

us-gaap:ContractualObligationDueInFifthYear

us-gaap:ContractualObligationDueInFourthYear

us-gaap:ContractualObligationDueInNextTwelveMonths

us-gaap:ContractualObligationDueInSecondYear

us-gaap:ContractualObligationDueInThirdYear
us-gaap:DebtInstrument
us-gaap:DebtInstrumentFaceAmount
us-gaap:DebtInstrument
us-gaap:DebtInstrumentRepurchaseAmount
us-gaap:DebtInstrument
us-gaap:DebtInstrumentRepurchasedFaceAmount
us-gaap:DebtInstrument
us-gaap:DebtInstrumentUnamortizedDiscount
us-gaap:DebtInstrument
us-gaap:DeferredFinanceCostsGross

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredTaxAssetsDerivativeInstruments

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards
us-gaap:IncomeTaxAuthority, us-gaap:IncomeTaxAuthorityName, us-gaap:TaxCreditCarryforward

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
us-gaap:DefinedBenefitPlanByPlanAssetCategories

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations
us-gaap:DefinedBenefitPlanByPlanAssetCategories

us-gaap:DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection

us-gaap:DerivativeAssetNotOffsetPolicyElectionDeduction

us-gaap:DerivativeAssetsCurrent
us-gaap:HedgingDesignation

us-gaap:DerivativeAssetsNoncurrent
us-gaap:HedgingDesignation
sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeCapPrice
sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

us-gaap:DerivativeFairValueOfDerivativeAsset
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeLiability
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation

us-gaap:DerivativeFairValueOfDerivativeNet
sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeFloorPrice
sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

us-gaap:DerivativeLiabilitiesCurrent
us-gaap:HedgingDesignation

us-gaap:DerivativeLiabilitiesNoncurrent
us-gaap:HedgingDesignation

us-gaap:DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection

us-gaap:DerivativeLiabilityNotOffsetPolicyElectionDeduction

us-gaap:EmployeeRelatedLiabilitiesCurrent
us-gaap:AwardType
us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:InterestPayableCurrent

us-gaap:LesseeOperatingLeaseDiscountRate

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear
us-gaap:CreditFacility
us-gaap:LettersOfCreditOutstandingAmount
us-gaap:CreditFacility, us-gaap:LongtermDebtType
us-gaap:CreditFacility, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:LongtermDebtType
us-gaap:LineOfCredit
us-gaap:CreditFacility, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity
us-gaap:LongtermDebtType
us-gaap:CreditFacility, us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:LongtermDebtType
us-gaap:CreditFacility
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity
us-gaap:CreditFacility, us-gaap:LongtermDebtType
us-gaap:CreditFacility, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:CreditFacility, us-gaap:SubsequentEventType
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:DebtInstrument
us-gaap:LongTermDebtFairValue

us-gaap:LongTermLineOfCredit
us-gaap:CreditFacility
us-gaap:CreditFacility, us-gaap:LongtermDebtType
us-gaap:CreditFacility, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:CreditFacility, us-gaap:SubsequentEventType
us-gaap:LongtermDebtType
us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization
us-gaap:IncomeTaxAuthority
us-gaap:OperatingLossCarryforwards

us-gaap:PropertyPlantAndEquipmentOtherAccumulatedDepreciation

us-gaap:PropertyPlantAndEquipmentOtherNet

us-gaap:ProvedOilAndGasPropertySuccessfulEffortMethod

us-gaap:SeniorLongTermNotes
us-gaap:DebtInstrument
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
us-gaap:AwardType
us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
us-gaap:Range
us-gaap:SharesIssuedPricePerShare
us-gaap:Range, us-gaap:SubsequentEventType
us-gaap:CreditFacility
us-gaap:UnamortizedDebtIssuanceExpense
us-gaap:CreditFacility, us-gaap:LongtermDebtType
us-gaap:DebtInstrument
us-gaap:LongtermDebtType

us-gaap:UnprovedOilAndGasPropertySuccessfulEffortMethod

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

Plots across concepts


IncomeStatement
Income Loss From Continuing Operations 
Before Income Taxes Extraordinary Items Noncontrolling Interest
Expenses
Other Nonoperating Income Expense
Balance Sheet
Cash And Cash Equivalents At Carrying Value
Assets
Cash And Cash Equivalents At Carrying Value
Current Assets
Cash And Cash Equivalents At Carrying Value
NonCurrent Assets
Operating Lease Right Of Use Asset
Liabilities
Operating Lease Liability
Current Liabilities
Other Liabilities Current
Noncurrent Liabilities
Operating Lease Liability Noncurrent
Stockholders Equity
Retained Earnings Accumulated Deficit
Per Share
Earnings Per Share Diluted
CashFlow
Net Income Loss
NetCashProvidedByUsedInOperatingActivities
Net Income Loss
NetCashProvidedByUsedInInvestingActivities
Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInFinancingActivities
Net Cash Provided By Used In Financing Activities
Shares
Weighted Average Number Of Diluted Shares Outstanding
OperatingLeaseLiability
Operating Lease Liability Current
LesseeOperatingLeaseLiabilityPaymentsDue
Lessee Operating Lease Liability Payments Due Year Four

Tables

  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
us-gaap:CommonStockValue █▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁1.211.1471.1471.1461.1361.131.131.1291.1251.1221.1221.1211.1181.1171.1171.116
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents us-gaap:CommonStock█▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁120.970853114.742304114.742304114.5728113.553271112.988682112.987952112.857163112.525633112.244545112.241966112.137582111.846998111.687016111.687016111.624029
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding █▁118.357114.759NA114.371113.008113.009NA113.334112.932112.252NA112.107113.63112.879NA111.575
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic █▁118.357114.759NA114.371113.008113.009NA112.804112.262112.252NA112.107111.701111.696NA111.575
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount ▁█5.1788.106NA0.1580.7011.219NA0.00.00.781NA2.4330.00.0NA0.0
us-gaap:EarningsPerShareBasic ▃▃▃▄▄▁▄▅▅▃█▄▅█▅▄-1.88-2.19-1.4399999999999995-0.86-0.79-3.64-0.89999999999999990.370.45-1.582.76-1.210.152.84-0.22999999999999998-0.8
us-gaap:EarningsPerShareDiluted ▃▃▃▄▄▁▄▅▅▃█▄▅█▅▄-1.88-2.19-1.4399999999999995-0.86-0.79-3.64-0.89999999999999990.370.45-1.582.7300000000000004-1.210.152.81-0.22999999999999998-0.8
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType us-gaap:PerformanceShares▆█▁▆█▇▇███▇█▇▇█▇1.33.2-2.61.62.82.62.32.92.92.82.63.02.42.42.92.6
 us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType us-gaap:RestrictedStockUnitsRSU▄▄▁▂▇▆▇▇▇▇▇█▄▇▇▇2.12.21.61.82.72.62.72.92.82.72.83.02.32.72.82.9
us-gaap:ComprehensiveIncomeNetOfTax ▃▃▃▄▄▁▄▅▅▃█▄▅█▅▄-222.403-251.078-169.027-97.097-89.064-411.705-101.56642.42450.507-177.305313.389-135.6617.395317.661-24.84-89.32
us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization ▇▄▃▃▁▇██125.456100.9395.96395.25780.445119.552127.312129.042NANANANANANANANA
us-gaap:CostsAndExpenses ▇▇▅▄▅█▆▄▄▆▁▆▄▄▅▄744.473654.767492.339384.147482.311836.826539.989290.84303.005526.239-35.573568.013387.768310.527441.39380.971
us-gaap:GainsLossesOnExtinguishmentOfDebt -2.144NA15.53525.07227.28112.1950.00.00.00.0-0.018-26.7220.00.00.00.0
 us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument sm:A6125SeniorUnsecuredNotesDue2022And50SeniorUnsecuredNotesDue2024-2.1NANA25.1NANANANANANANANANANANANA
us-gaap:GeneralAndAdministrativeExpense ▃▃▁▃▄▄█▆▅▆▅▅▅▄▇▄24.63924.71420.03424.45227.22727.44737.21332.57830.9232.08630.43829.46428.9227.68235.02127.88
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest ▃▃▃▄▄▁▄▅▅▃█▄▅█▄▄-223.157-251.163-198.604-121.261-125.937-510.903-129.76158.34563.978-223.606391.76-172.67116.296416.392-143.403-128.382
us-gaap:IncomeTaxExpenseBenefit ▅▅▄▄▄▂▄▅▅▃▇▄▅█▁▄-0.1620.106-33.429-22.969-36.685-99.008-27.70616.11113.59-46.03882.028-36.748-0.90198.991-117.145-39.27
us-gaap:InterestExpense ▃▃▄▅▄▅▄▄▃▁▁▁▅▇▇█39.53639.87140.50741.51940.35441.51240.91140.58439.62737.9838.05638.11141.65443.08543.61844.091
 us-gaap:InterestExpenseDebt us-gaap:DebtInstrument sm:A150SeniorSecuredConvertibleNotesDue2021▁▁▁▁▇█1.11.21.11.12.62.9NANA2.7NANANANANANANA
us-gaap:InterestPaidNet ▂█▁▅▄▇▃▆▃▅▃▇▅▅▅▆21.41553.44918.31939.86134.84447.46928.7845.47627.68939.95726.29246.63237.74340.0639.65440.95
us-gaap:NetIncomeLoss ▃▃▃▄▄▁▄▅▅▃█▄▅█▅▄-222.995-251.269-165.175-98.292-89.252-411.895-102.05542.23450.388-177.568309.732-135.92317.197317.401-26.258-89.112
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings█▁-222.995-251.269NA-98.292-89.252-411.895NA42.23450.388-177.568NA-135.92317.197317.401NANA
us-gaap:OperatingIncomeLoss ▃▃▃▄▂▁▄▅▅▃█▄▅█▄▄-180.624-210.921-172.047-103.132-312.679-481.092-88.30399.477104.167-185.309429.765-108.64456.148459.068-100.852-85.592
us-gaap:OtherComprehensiveIncomeLossNetOfTax ▅▅▁▆▅▅▅▅▅▅█▅▅▅▆▄0.5920.191-3.8521.1950.1880.190.4890.190.1190.2633.6570.2630.1980.261.418-0.208
us-gaap:OtherNonoperatingIncomeExpense ▃▄▁▁▄▃▃▃▃▄▅▆█▅▇▇-0.853-0.371-1.585-1.68-0.185-0.494-0.547-0.548-0.562-0.3170.0690.8061.8020.4091.0671.301
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax █▆▄▃▁▄▆▅▅▄▅▆▅▅▄▃562.569423.165320.153282.012169.79354.233449.001389.419406.854340.476392.531458.382402.558382.886341.187294.459
us-gaap:Revenues ▆▄▃▂▁▃▄▄▄▃▄▄▄█▃▂563.849443.846320.292281.015169.632355.734451.686390.317407.172340.93394.192459.369443.916769.595340.538295.379
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
us-gaap:Assets ▁▁▁▂▂▄▆▇▇▆▆▆██▆▆5052.9985015.6454976.4315122.2855267.6285615.0256292.2326453.0836391.9396286.6186352.8626273.7216736.4856659.9886176.7766178.926
us-gaap:LiabilitiesAndStockholdersEquity ▁▁▁▂▂▄▆▇▇▆▆▆██▆▆5052.9985015.6454976.4315122.2855267.6285615.0256292.2326453.0836391.9396286.6186352.8626273.7216736.4856659.9886176.7766178.926
us-gaap:StockholdersEquity ▁▂▃▄▅▅▇█▇▇█▆▇▇▅1552.5091769.6722016.162185.1082280.8322341.7172748.9942843.752801.8432743.2252920.3222599.3992736.6272712.0972394.608NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
us-gaap:AssetsCurrent ▂▁▁▂▂▅▁▂▂▁▃▃██▄▅269.41230.282203.669274.89355.469625.16252.634311.114288.734221.334429.263453.142955.21923.192549.115668.912
us-gaap:CashAndCashEquivalentsAtCarryingValue NANA0.010.010.010.0150.010.010.0120.01477.965176.806615.906643.337313.943441.415
us-gaap:AccountsReceivableNetCurrent █▆▃▂▁▂▅▂▄▂▄▅▅▅▃▂229.512199.631162.455136.613127.173143.311184.732146.211165.757145.299167.536179.347178.682192.562160.154146.056
us-gaap:PrepaidExpenseAndOtherAssetsCurrent ▁▂▂▂▅▆▃█▁▁▁▅▄▂▂▆8.5959.79210.00110.22116.70417.84212.70821.7518.7238.4548.63215.82614.2939.99710.75217.756
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
us-gaap:PropertyPlantAndEquipmentNet ▁▁▁▁▂▂████▇▇▆▆▅▅4714.8094712.6164701.8664765.1014825.8254888.3385953.6486029.1435985.3295954.395831.1655776.1875718.455669.5495554.7925417.083
us-gaap:OperatingLeaseRightOfUseAsset NANA21.70124.72827.77833.36539.717NANANANANANANANANA
us-gaap:OtherAssetsNoncurrent ▄▄▃▃▄▄▅▆█▇▁▁▁▁▁▁55.24559.1847.74650.78551.94456.61865.32674.25587.69683.69233.93535.53931.67432.11932.50732.896
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent █▅▄▂▁▄▅▆▅▆▅▆▇▇▅▄496.285394.226371.67287.777257.053359.406402.008431.44407.883426.55403.199429.698446.318468.108386.63348.885
us-gaap:AccountsPayableCurrent NANA63.006NANANA52.094NANANA56.047NANANA77.573NA
us-gaap:AccruedLiabilitiesCurrent NANA65.365NANANA96.925NANANA139.711NANANA126.5NA
us-gaap:LiabilitiesCurrent █▅▄▂▁▂▃▃▃▃▂▅█▄▃▂1051.668776.619583.739377.278307.9383.463472.043491.042503.945545.342466.052733.8571047.957649.176559.212436.676
us-gaap:OperatingLeaseLiabilityCurrent NANA11.65912.31112.59715.7819.189NANANANANANANANANA
us-gaap:OtherAccruedLiabilitiesCurrent NANA32.627NANANA27.041NANANA20.328NANANA29.21NA
us-gaap:OtherLiabilitiesCurrent ▄▄▄▄▄▅▆▇█▇▁10.32110.59111.8812.53212.59715.7819.18921.80425.80323.5230.0NANANANANA
 us-gaap:TaxesPayableCurrent us-gaap:IncomeTaxAuthority us-gaap:StateAndLocalJurisdictionNANA0.853NANANA1.404NANANA1.331NANANA3.009NA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
us-gaap:LiabilitiesNoncurrent ▂▂▁▂▃▅▆▆▆▆▅▅▅█▇█2448.8212469.3542376.5322559.8992678.8962889.8453071.1953118.2913086.1512998.0512966.4882940.4652951.9013298.7153222.9563330.209
us-gaap:LongTermDebt ▁█▃2192.1252260.6512214.319NA2263.119NA2610.298NANANANANANANANANA
us-gaap:LongTermDebtNoncurrent NANANA2175.038NANA2610.298NANANANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument sm:A100SeniorSecuredNotesDue2025NANANA394.878NANANANANANANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument sm:A150SeniorSecuredConvertibleNotesDue2021NANANA62.513NANANANANANANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument sm:A50SeniorUnsecuredNotesDue2024NANANA313.692NANA496.234NANANANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument sm:A5625SeniorUnsecuredNotesDue2025NANANA346.168NANA495.097NANANANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument sm:A6125SeniorUnsecuredNotesDue2022NANANA230.826NANA473.876NANANANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument sm:A6625SeniorUnsecuredNotesDue2027NANANA411.871NANA493.399NANANANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument sm:A675SeniorUnsecuredNotesDue2026NANANA415.09NANA494.429NANANANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument sm:SeniorSecuredNotesNANANA457.391NANANANANANANANANANANANA
 us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument sm:SeniorUnsecuredNotesNANANA1717.647NANA2610.298NANANANANANANANANA
us-gaap:UnsecuredLongTermDebt █▁▁1671.8181661.4291660.663NANANANANANANANANANANANANA
us-gaap:SecuredLongTermDebt █▄▁467.807464.222460.656NANANANANANANANANANANANANA
us-gaap:DeferredIncomeTaxLiabilitiesNet NANANA34.58257.04993.918189.386NANANANANANANANANA
us-gaap:OtherLiabilitiesNoncurrent ▄▅▅▄▄▅▆▇██▁▂▂▂▃▂55.03356.90256.55752.19755.07258.07461.43363.23367.1468.05842.52245.8145.90645.78648.447.497
us-gaap:OperatingLeaseLiabilityNoncurrent NANA11.89814.47117.43320.0123.137NANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo NANA5.8915.92NANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree NANA3.5913.596NANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive NANA1.222NANANANANANANANANANANANANA
us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive NANA0.4171.64NANANANANANANANANANANANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
us-gaap:StockholdersEquity ▁▂▃▄▅▅▇█▇▇█▆▇▇▅1552.5091769.6722016.162185.1082280.8322341.7172748.9942843.752801.8432743.2252920.3222599.3992736.6272712.0972394.608NA
us-gaap:CommonStockValue █▃▃▃▂▂▂▂▂▁▁▁▁▁▁▁1.211.1471.1471.1461.1361.131.131.1291.1251.1221.1221.1211.1181.1171.1171.116
us-gaap:AdditionalPaidInCapitalCommonStock ██▇▇▇▅▅▄▄▃▃▃▂▂▁▁1838.8591833.6511827.9141827.8361825.3271797.1541791.5961784.7871779.6651771.5581765.7381758.2051754.1691747.0351741.6231734.217
us-gaap:RetainedEarningsAccumulatedDeficit ▁▂▃▄▅▅▇█▇▇█▆▇▇▆▆-274.745-51.719200.697365.872465.31554.562967.5871069.6421033.051982.6621165.842856.111997.641980.444665.657691.915
us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax ▅▄▄█▇▇▆▆▆▆▅▁▁▁▄▂-12.815-13.407-13.598-9.746-10.941-11.129-11.319-11.808-11.998-12.117-12.38-16.038-16.301-16.499-13.789-15.207
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
us-gaap:NetCashProvidedByUsedInOperatingActivities █▁▇▅▁▅▆▅▇▁▄▆▃▂296.399105.624256.86201.613114.339218.132241.981203.156259.928118.502179.452229.659171.383140.135NANA
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▃▄▄▃▃▂▂▁▂▂▁▃█-222.322-147.634-128.806-116.643-170.811-139.306-234.588-215.415-320.353-242.935-273.974-308.241-194.978189.259NANA
us-gaap:NetCashProvidedByUsedInFinancingActivities ▆█▅▆█▆▇▇██▇▁▇▇-74.07742.0-128.054-84.9756.467-78.821-10.8949.3666.82146.482-4.319-360.518-3.8360.0NANA
us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect █▁0.0-0.01NANA-0.0050.005-3.501-2.8996.396-77.951-98.841-439.1-27.431329.394-127.472-118.106
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
us-gaap:DeferredIncomeTaxExpenseBenefit ▅▅▄▄▄▂▄▆▅▃▇▄▅█▁▄-0.162-0.052-33.476-22.796-36.921-99.347-28.21519.61713.766-47.00381.036-36.833-0.86198.366-124.608-36.668
us-gaap:NetCashProvidedByUsedInOperatingActivities █▁▇▅▁▅▆▅▇▁▄▆▃▂296.399105.624256.86201.613114.339218.132241.981203.156259.928118.502179.452229.659171.383140.135NANA
us-gaap:NetIncomeLoss ▃▃▃▄▄▁▄▅▅▃█▄▅█▅▄-222.995-251.269-165.175-98.292-89.252-411.895-102.05542.23450.388-177.568309.732-135.92317.197317.401-26.258-89.112
 us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents us-gaap:RetainedEarnings█▁-222.995-251.269NA-98.292-89.252-411.895NA42.23450.388-177.568NA-135.92317.197317.401NANA
us-gaap:ShareBasedCompensation ▅▇▁▅▇▇▇█▇▇▇█▆▇█▇3.9565.737-0.4384.1645.7125.5615.566.7666.1545.8386.2287.0045.2645.4126.546.347
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
us-gaap:NetCashProvidedByUsedInInvestingActivities ▂▃▄▄▃▃▂▂▁▂▂▁▃█-222.322-147.634-128.806-116.643-170.811-139.306-234.588-215.415-320.353-242.935-273.974-308.241-194.978189.259NANA
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
us-gaap:NetCashProvidedByUsedInFinancingActivities ▆█▅▆█▆▇▇██▇▁▇▇-74.07742.0-128.054-84.9756.467-78.821-10.8949.3666.82146.482-4.319-360.518-3.8360.0NANA
us-gaap:PaymentsOfDividendsCommonStock NANA1.1460.0NANA5.6420.0NANA5.6070.0NANA5.5810.0
  2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument sm:A100SeniorSecuredNotesDue2025NANANA1e-051.0000000000000001e-07NANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument sm:A150SeniorSecuredConvertibleNotesDue2021NANANA1.5e-061.5e-08NANANANANANANANANANANA
 us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument sm:A50SeniorUnsecuredNotesDue2024NANANA5e-065.0000000000000004e-08NANANANANANANANANANANA

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1210000.01147000.01147000.01146000.01136000.01130000.01130000.01129000.01125000.01122000.01122000.01121000.01118000.01117000.01117000.01116000.01115000.01113000.01113000.0869000.0683000.0681000.0681000.0680000.0676000.0675000.0675000.0674000.0671000.0671000.0671000.0670000.0664000.0663000.0662000.0652000.0642000.0641000.0641000.0638000.0637000.0634000.0629000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Shares Outstanding

us-gaap:CommonStockSharesOutstanding us-gaap:StatementEquityComponents

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStock


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302015-12-312014-12-31
Value120114114114113112112112112112112112111111111111111111111866867
Percentage of CommonStockSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value118114114113113113112112112113112111111111786868686767686868686767656767676663646464
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic


Weighted
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-09-302011-06-302011-03-312010-09-302010-06-302010-03-31
Value118114114113113112112112112111111111111111786868676767676767666666656464636363636262
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount


Antidilutive
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-302017-06-302017-03-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-31
Value5178000.08106000.0158000.0701000.01219000.000781000.02433000.000044000.00506000.0155000.049000.00590000.0452000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.00.00.0100.0100.00.00.00.0100.00.0100.0100.0100.00.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareBasic


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.88-2.19-1.44-0.86-0.79-3.64-0.90.370.45-1.582.76-1.210.152.84-0.23-0.8-1.080.67-2.12-0.52-2.48-5.1-5.020.05-0.85-0.794.933.10.890.980.11.061.150.25-1.03-0.580.390.41-1.93.61.96-0.290.590.250.292.01
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:EarningsPerShareDiluted

us-gaap:EarningsPerShareDiluted


Earnings
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-1.88-2.19-1.44-0.86-0.79-3.64-0.90.370.45-1.582.73-1.210.152.81-0.23-0.8-1.080.67-2.12-0.52-2.48-5.1-5.020.05-0.85-0.794.893.050.880.960.11.041.130.25-1.02-0.580.370.39-1.83.411.86-0.290.570.240.281.96
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Allocated Share Based Compensation Expense

us-gaap:AllocatedShareBasedCompensationExpense us-gaap:AwardType

us-gaap:AllocatedShareBasedCompensationExpense

us-gaap:PerformanceShares


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value1.33.2-2.61.62.82.62.32.92.92.82.63.02.42.42.92.61.72.52.82.33.02.93.22.42.72.34.44.83.63.23.63.55.04.75.15.22.9
Percentage of AllocatedShareBasedCompensationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.20.80.00.61.60.70.00.70.70.80.00.70.60.60.00.90.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:PerformanceShares0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RestrictedStockUnitsRSU


Allocated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value2.12.21.61.82.72.62.72.92.82.72.83.02.32.72.82.92.12.52.62.83.33.23.54.12.92.93.44.82.92.83.13.73.33.03.33.91.41.2
Percentage of AllocatedShareBasedCompensationExpense161.568.8-61.5112.596.4100.0117.4100.096.696.4107.7100.095.8112.596.6111.5123.5100.092.9121.7110.0110.3109.4170.8107.4126.177.3100.080.687.586.1105.766.063.80.076.526.941.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.40.50.00.61.60.70.00.70.70.80.00.70.60.70.01.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RestrictedStockUnitsRSU0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Comprehensive Income Net Of Tax

us-gaap:ComprehensiveIncomeNetOfTax

us-gaap:ComprehensiveIncomeNetOfTax


Comprehensive
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value-222.403-251.078-169.027-97.097-89.064-411.705-101.5664250-177.305313-135.6617317-24.84-89.32-119.78373-201.34-41.162-168.95-347.446-341.5763.094-58.084-53.23432520960659.482707716-70.408-38.652425-118.658234128
Percentage of ComprehensiveIncomeNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-39.5-59.30.0-34.4-52.5-116.20.010.912.4-52.10.0-29.64.383.00.0-30.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Cost Of Goods And Service Excluding Depreciation Depletion And Amortization

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization

us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization


Cost
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value125100959580119127129
Percentage of CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax22.323.90.033.847.433.70.033.1

Costs And Expenses

us-gaap:CostsAndExpenses

us-gaap:CostsAndExpenses


Costs
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value744654492384482836539290303526-35.57356838731044138026820766437057266980933956742037261553504596475415437530421252321559157166335230195174152
Percentage of CostsAndExpenses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax132.3154.70.0136.2284.1236.20.074.774.5154.60.0123.996.381.10.0129.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Gains Losses On Extinguishment Of Debt

us-gaap:GainsLossesOnExtinguishmentOfDebt

us-gaap:GainsLossesOnExtinguishmentOfDebt


Gains
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-30
Value-2.1441525227120.00.00.00.0-0.018-26.7220.00.00.00.00.0-0.0350.00.00.0150.00.0-16.5780.00.00.00.0
Percentage of GainsLossesOnExtinguishmentOfDebt100.0100.0100.0100.0100.00.00.00.00.0100.0100.00.00.00.00.00.0100.00.00.00.0100.00.00.0100.00.00.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.40.08.9133.93.40.00.00.00.00.0-5.80.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:GainsLossesOnExtinguishmentOfDebt us-gaap:DebtInstrument

sm:A6125SeniorUnsecuredNotesDue2022And50SeniorUnsecuredNotesDue2024


Gains
Period End2021-06-302020-09-30
Value-2.125
Percentage of GainsLossesOnExtinguishmentOfDebt97.9100.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.48.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:A6125SeniorUnsecuredNotesDue2022And50SeniorUnsecuredNotesDue20240.00.0

General And Administrative Expense

us-gaap:GeneralAndAdministrativeExpense

us-gaap:GeneralAndAdministrativeExpense


General
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value24242024272737323032302928273527282933322832333742435241383547333532283231283529272531262523
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax4.45.80.08.716.07.70.08.47.69.40.06.47.27.20.09.50.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-31
Value-223.157-251.163-198.604-121.261-125.937-510.903-129.7615863-223.606391-172.67116416-143.403-128.382-190.968118-330.613-64.639-264.579-542.085-537.113-1.026-98.211-86.511530333951041511312227-104.146-61.0723942
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-39.7-59.40.0-43.0-74.2-144.20.015.015.7-65.70.0-37.74.0108.80.0-43.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Income Tax Expense Benefit

us-gaap:IncomeTaxExpenseBenefit

us-gaap:IncomeTaxExpenseBenefit


Income
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-0.1620.106-33.429-22.969-36.685-99.008-27.7061613-46.03882-36.748-0.90198-117.145-39.27-71.06144-129.667-23.732-95.898-194.875-196.855-4.14-40.703-33.45319812436388.755424610-37.008-22.7361415-71.55713372-11.055219.3461274
Percentage of IncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.00.00.0-8.1-21.6-27.90.04.13.3-13.50.0-8.0-0.225.90.0-13.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense

us-gaap:InterestExpense

us-gaap:InterestExpense


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3939404140414040393738384143434444464647343131333032272224242424211918181214129.372149.7144.7276.3396.3436.787
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax7.09.40.014.723.811.70.010.49.711.20.08.310.311.30.015.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Interest Expense Debt

us-gaap:InterestExpenseDebt us-gaap:DebtInstrument

us-gaap:InterestExpenseDebt

sm:A150SeniorSecuredConvertibleNotesDue2021


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-06-30
Value1.11.21.11.12.62.92.7
Percentage of InterestExpenseDebt100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.20.30.00.41.50.80.7
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:A150SeniorSecuredConvertibleNotesDue20210.00.00.00.00.00.00.0

Interest Paid Net

us-gaap:InterestPaidNet

us-gaap:InterestPaidNet


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-31
Value215318393447284527392646374039404042412439243824303410319.55237
Percentage of InterestPaidNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax3.812.60.014.120.513.40.011.76.811.70.010.29.410.50.013.90.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-222.995-251.269-165.175-98.292-89.252-411.895-102.0554250-177.568309-135.92317317-26.258-89.112-119.90774
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-39.6-59.40.0-34.9-52.6-116.30.010.812.4-52.20.0-29.74.382.90.0-30.30.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
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-222.995-251.269-98.292-89.252-411.8954250-177.568-135.92317317
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-39.6-59.4-34.9-52.6-116.310.812.4-52.2-29.74.382.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

Operating Income Loss

us-gaap:OperatingIncomeLoss

us-gaap:OperatingIncomeLoss


Operating
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-180.624-210.921-172.047-103.132-312.679-481.092-88.30399104-185.309429-108.64456459-100.852-85.592-147.638165-284.387-17.654-230.549-526.725-505.57332-50.879-54.4355583561211284013714446-85.797-42.8365256-180.139372211-19.972633136207
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-32.1-49.80.0-36.6-184.2-135.80.025.525.6-54.40.0-23.713.9119.90.0-29.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Comprehensive Income Loss Net Of Tax

us-gaap:OtherComprehensiveIncomeLossNetOfTax

us-gaap:OtherComprehensiveIncomeLossNetOfTax


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-09-302015-06-302015-03-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-31
Value592000.0191000.0-3852000.01195000.0188000.0190000.0489000.0190000.0119000.0263000.03657000.0263000.0198000.0260000.01418000.0-208000.0124000.0-567000.0-394000.0-255000.0-269000.0-236000.0-20000.0-576000.0-176000.0196000.0330000.00308000.0746000.058000.0-314000.0-116000.0-1034000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.00.00.40.10.10.00.00.00.10.00.10.00.10.0-0.10.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:OtherComprehensiveIncomeLossNetOfTax us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Other
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-31
Value592000.0191000.01195000.0188000.0190000.0190000.0119000.0263000.0263000.0198000.0260000.01418000.0-208000.0124000.0-567000.0-394000.0
Percentage of OtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.10.00.40.10.10.00.00.10.10.00.10.0-0.10.00.00.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Other Nonoperating Income Expense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:OtherNonoperatingIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-30
Value-853000.0-371000.0-1585000.0-1680000.0-185000.0-494000.0-547000.0-548000.0-562000.0-317000.069000.0806000.01802000.0409000.01067000.01301000.01265000.0335000.0130000.0221000.05000.06000.026000.027000.025000.0571000.0-68000.0-672000.0-1847000.026000.03000.028000.024000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-0.2-0.10.0-0.6-0.1-0.10.0-0.1-0.1-0.10.00.20.40.10.00.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Including Assessed Tax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value562423320282169354449389406340392458402382341294
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService

sm:NaturalGasRevenue


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value88896249344068646565949684798086
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.721.219.517.620.511.515.216.416.019.124.121.120.920.723.529.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax15.721.219.517.620.511.515.216.416.019.124.121.120.920.723.529.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:NaturalGasRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:OilRevenue


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value436305234207119291347292304239250287266261203154
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax77.672.373.373.670.482.377.375.274.870.263.962.766.168.259.752.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax77.672.373.373.670.482.377.375.274.870.263.962.766.168.259.752.4
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:OilRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:OilandCondensateRevenue


Revenue
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-30
Value37272324152133323736477452425753
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax6.76.67.28.89.16.27.58.39.210.712.016.213.011.216.818.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax6.76.67.28.89.16.27.58.39.210.712.016.213.011.216.818.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:OilandCondensateRevenue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:ProductOrService, us-gaap:StatementGeographical

sm:NaturalGasRevenue, sm:MidlandBasin


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
Value515730231111261716152840
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.113.79.48.37.03.25.84.64.04.67.38.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax9.113.79.48.37.03.25.84.64.04.67.38.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:NaturalGasRevenue sm:MidlandBasin100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:NaturalGasRevenue, sm:SouthTexas


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
Value363132262229424648496556
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax6.67.510.09.313.58.39.411.912.014.516.812.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax6.67.510.09.313.58.39.411.912.014.516.812.3
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:NaturalGasRevenue sm:SouthTexas100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:OilRevenue, sm:MidlandBasin


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
Value404286217194114276328277288225234270
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax71.967.667.969.067.478.073.271.270.966.259.758.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax71.967.667.969.067.478.073.271.270.966.259.758.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:OilRevenue sm:MidlandBasin100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:OilRevenue, sm:SouthTexas


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
Value311917135.15815181515131617
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax5.74.65.44.63.04.44.14.03.94.14.23.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax5.74.65.44.63.04.44.14.03.94.14.23.8
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:OilRevenue sm:SouthTexas100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:OilandCondensateRevenue, sm:MidlandBasin


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
Value0.1120.10.1060.1150.0450.0580.0210.124-0.0430.0210.1840.563
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.0-0.00.00.00.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.00.00.00.00.00.00.00.0-0.00.00.00.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:OilandCondensateRevenue sm:MidlandBasin100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:OilandCondensateRevenue, sm:SouthTexas


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
Value372723241521333237364673
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax6.76.57.28.89.16.17.58.39.210.712.016.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax6.76.57.28.89.16.17.58.39.210.712.016.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:OilandCondensateRevenue sm:SouthTexas100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:StatementGeographical

sm:MidlandBasin


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
Value456344247217126287354295304240263311
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax81.181.377.477.374.481.279.075.874.970.767.167.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax81.181.377.477.374.481.279.075.874.970.767.167.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:MidlandBasin100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:SouthTexas


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
Value1067972644366949410299129147
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax18.918.722.622.725.618.821.024.225.129.332.932.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax18.918.722.622.725.618.821.024.225.129.332.932.1
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax sm:SouthTexas100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:Revenues

us-gaap:Revenues


Revenues
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value563443320281169355451390407340394459443769340295120372379352341143303371516365595618674632636613559484444378304377379530377315294226211360
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax100.2104.9100.099.699.9100.4100.6100.2100.1100.1100.4100.2110.3201.099.8100.30.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets

us-gaap:Assets

us-gaap:Assets


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value50525015497651225267561562926453639162866352627367366659617661786212639963935785504452075621621362136600651656605004468947054736459042924199412339993845379834563219305327442360
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities And Stockholders Equity

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:LiabilitiesAndStockholdersEquity


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value50525015497651225267561562926453639162866352627367366659617661786212639963935785504452075621621362136600651656605004468947054736459042924199412339993845379834563219305327442360
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value155217692016218522802341274828432801274329202599273627122394249718522286
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.735.340.542.743.341.743.744.143.843.646.041.440.640.738.839.133.035.1

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value-12.815-13.407-13.598-9.746-10.941-11.129-11.319-11.808-11.998-12.117-12.38-16.038-16.301-16.499-13.789-14.556-13.402-11.312
Percentage of StockholdersEquity-0.8-0.8-0.7-0.4-0.5-0.5-0.4-0.4-0.4-0.4-0.4-0.6-0.6-0.6-0.6-0.6-0.7-0.5
Percentage of Assets-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.2-0.2-0.2
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value1838183318271827182517971791178417791771176517581754174717411716305283
Percentage of StockholdersEquity118.4103.690.783.680.076.765.262.863.564.660.567.664.164.472.768.716.512.4
Percentage of Assets36.436.636.735.734.732.028.527.727.828.227.828.026.026.228.226.85.44.3
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value1.211.1471.1471.1461.1361.131.131.1291.1251.1221.1221.1211.1181.1171.1171.1130.6810.675
Percentage of StockholdersEquity0.10.10.10.10.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value-274.745-51.71920036546555496710691033982116585699798066579415592013
Percentage of StockholdersEquity-17.7-2.910.016.720.423.735.237.636.935.839.932.936.536.227.831.884.288.1
Percentage of Assets-5.4-1.04.07.18.89.915.416.616.215.618.413.614.814.710.812.427.730.9
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Assets Current

us-gaap:AssetsCurrent

us-gaap:AssetsCurrent


Assets
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value2692302032743556252523112882214294539559235496687698492241246304405518537525669745371506577647345395320340325334343463304346403274209
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets5.34.64.15.46.711.14.04.84.53.56.87.214.213.98.910.812.413.33.521.56.07.89.28.78.510.111.46.610.112.313.87.38.67.58.17.98.48.912.28.810.713.210.08.9

Cash And Cash Equivalents At Carrying Value

us-gaap:CashAndCashEquivalentsAtCarryingValue

us-gaap:CashAndCashEquivalentsAtCarryingValue


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-312009-12-312008-12-312007-12-31
Value0.010.010.010.0150.010.010.0120.014771766156433134415596599.3729800.0180.0510.0180.1970.0820.0220.120.2691632362820.1760.1760.0875.9260.1840.1840.286119291011915.0777.0891040106.13143
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 Assets0.00.00.00.00.00.00.00.01.22.89.19.75.17.19.010.30.117.00.00.00.00.00.00.00.00.03.35.06.00.00.00.00.10.00.00.03.10.93.16.30.20.00.00.00.50.00.0

Accounts Receivable Net Current

us-gaap:AccountsReceivableNetCurrent

us-gaap:AccountsReceivableNetCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value229199162136127143184146165145167179178192160146105108151140143111134171239270322304312307318278291255254235209224210183173146163116
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.54.03.32.72.42.62.92.32.62.32.62.92.72.92.62.41.71.72.42.42.92.12.42.83.94.15.05.46.26.66.85.96.36.06.15.75.25.85.55.35.44.85.94.9

us-gaap:AccountsReceivableNetCurrent us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

sm:DerivativeSettlementReceivable


Accounts
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value166.8689.4750.0996.51234390.77
Percentage of AccountsReceivableNetCurrent10.13.75.70.14.325.812.30.2
Percentage of Assets0.30.10.10.00.10.60.60.0
Percentage of Assets sm:DerivativeSettlementReceivable0.00.00.00.00.00.00.00.0

sm:DueFromJointInterestOwners


Accounts
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value31223156292258
Percentage of AccountsReceivableNetCurrent19.412.318.835.519.516.618.1
Percentage of Assets0.60.40.50.90.50.40.9
Percentage of Assets sm:DueFromJointInterestOwners0.00.00.00.00.00.00.0

sm:OtherReceivables


Accounts
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value3.3644.806144.244.3486.948192314152.665
Percentage of AccountsReceivableNetCurrent2.12.68.92.62.95.26.17.45.67.21.6
Percentage of Assets0.10.10.20.10.10.10.30.50.30.40.1
Percentage of Assets sm:OtherReceivables0.00.00.00.00.00.00.00.00.00.00.0

sm:TaxesReceivable


Accounts
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2.3014.0694.4152.2761512242917142.114
Percentage of AccountsReceivableNetCurrent1.42.22.61.410.19.07.69.26.87.11.3
Percentage of Assets0.00.10.10.00.20.20.40.60.40.40.1
Percentage of Assets sm:TaxesReceivable0.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AccruedIncomeReceivable


Accounts
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value15210879606214610610010910712011597969658180228160149108
Percentage of AccountsReceivableNetCurrent76.267.058.047.943.379.272.760.475.364.067.164.450.460.363.243.455.971.763.071.066.4
Percentage of Assets3.02.21.51.21.12.31.61.61.71.71.91.71.51.61.51.02.84.83.83.93.9
Percentage of Assets us-gaap:AccruedIncomeReceivable0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Prepaid Expense And Other Assets Current

us-gaap:PrepaidExpenseAndOtherAssetsCurrent

us-gaap:PrepaidExpenseAndOtherAssetsCurrent


Prepaid
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
Value8.5959.7921010161712218.7238.4548.63215149.9971017188.0538.79915141217191618191615149.9441030283039464468303245
Percentage of PrepaidExpenseAndOtherAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.30.30.20.30.10.10.10.30.20.20.20.30.30.10.10.30.30.20.30.30.30.30.30.30.30.30.20.20.70.70.70.91.21.11.80.91.01.7

Property Plant And Equipment Net

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:PropertyPlantAndEquipmentNet


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value47144712470147654825488859536029598559545831577657185669555454175346545060814364460146034950545154855643550352154434400438594181398937813677360134263278309630422811259024342127
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets93.394.094.593.091.687.194.693.493.694.791.892.184.985.189.987.786.185.295.175.491.288.488.187.788.385.584.592.188.685.482.088.386.988.187.687.385.785.381.588.087.384.888.790.1

Operating Lease Right Of Use Asset

us-gaap:OperatingLeaseRightOfUseAsset

us-gaap:OperatingLeaseRightOfUseAsset


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value2124273339
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.0100.0
Percentage of Assets0.40.50.50.60.6

Other Assets Noncurrent

us-gaap:OtherAssetsNoncurrent

us-gaap:OtherAssetsNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5559475051566574878333353132323214151918253631777183785156697086827578808478836951471616
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.21.01.01.01.01.01.21.41.30.50.60.50.50.50.50.20.20.30.30.50.70.61.21.11.31.20.91.11.51.51.81.81.81.91.92.12.02.22.01.61.50.60.7

Accounts Payable And Accrued Liabilities Current

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent

us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent


Accounts
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value496394371287257359402431407426403429446468386348311299299277257293302361423561640664592443606601577480525474460413456400413375417236
Percentage of AccountsPayableAndAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.87.97.55.64.96.46.46.76.46.86.36.86.67.06.35.65.04.74.74.85.15.65.45.86.88.59.811.711.89.512.912.712.611.212.511.511.510.712.011.612.812.315.210.0

Accounts Payable Current

us-gaap:AccountsPayableCurrent

us-gaap:AccountsPayableCurrent


Accounts
Period End2020-12-312019-12-312018-12-312017-12-31
Value63525677
Percentage of AccountsPayableCurrent100.0100.0100.0100.0
Percentage of Assets1.30.80.91.3

Accrued Liabilities Current

us-gaap:AccruedLiabilitiesCurrent

us-gaap:AccruedLiabilitiesCurrent


Accrued
Period End2020-12-312019-12-312018-12-312017-12-31
Value6596139126
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0
Percentage of Assets1.31.52.22.0

Liabilities Current

us-gaap:LiabilitiesCurrent

us-gaap:LiabilitiesCurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value10517765833773073834724915035454667331047649559436347353415328320303302485522696784669684515639629588510541499475471505423483489502296
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets20.815.511.77.45.86.87.57.67.98.77.311.715.69.79.17.15.65.56.55.76.45.85.47.88.410.512.011.813.711.013.613.312.811.912.912.111.912.313.312.315.016.018.312.6

Operating Lease Liability Current

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OperatingLeaseLiabilityCurrent


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value1112121519
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.30.3

Other Accrued Liabilities Current

us-gaap:OtherAccruedLiabilitiesCurrent

us-gaap:OtherAccruedLiabilitiesCurrent


Other
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value32272029444972
Percentage of OtherAccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.70.40.30.50.70.91.1

Other Liabilities Current

us-gaap:OtherLiabilitiesCurrent

us-gaap:OtherLiabilitiesCurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value101011121215192125230.01.150.00.00.00.01.00.00.0116.06.06.07.06.926.0
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.00.00.00.00.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.20.20.20.20.20.30.30.30.40.40.00.00.00.00.00.00.00.00.00.20.10.10.10.20.20.2

Taxes Payable Current

us-gaap:TaxesPayableCurrent us-gaap:IncomeTaxAuthority

us-gaap:TaxesPayableCurrent

us-gaap:StateAndLocalJurisdiction


Taxes
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value853000.01404000.01331000.03009000.01181000.0025000.01460000.00774000.0
Percentage of TaxesPayableCurrent100.0100.0100.0100.0100.00.0100.0100.00.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:StateAndLocalJurisdiction0.00.00.00.00.00.00.00.00.00.0

Liabilities Noncurrent

us-gaap:LiabilitiesNoncurrent

us-gaap:LiabilitiesNoncurrent


Liabilities
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value24482469237625592678288930713118308629982966294029513298322233303363343034813608337433953466354135033668344530392573249824592520247523452243214919961883183014451387135110231090
Percentage of LiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets48.549.247.850.050.951.548.848.348.347.746.746.943.849.552.253.954.153.654.462.466.965.261.757.056.455.652.953.751.453.352.353.253.954.653.452.149.949.048.241.843.144.237.346.2

Long Term Debt

us-gaap:LongTermDebt

us-gaap:LongTermDebt


Long
Period End2021-06-302021-03-312020-12-312020-06-302019-12-312013-12-312012-12-31
Value2192226022142263261016001100
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets43.445.144.543.041.534.026.2

Long Term Debt Noncurrent

us-gaap:LongTermDebtNoncurrent

us-gaap:LongTermDebtNoncurrent


Long
Period End2020-09-302019-12-31
Value21752610
Percentage of LongTermDebtNoncurrent100.0100.0
Percentage of Assets42.541.5

us-gaap:LongTermDebtNoncurrent us-gaap:DebtInstrument

sm:A100SeniorSecuredNotesDue2025


Long
Period End2020-09-30
Value394
Percentage of LongTermDebtNoncurrent18.2
Percentage of Assets7.7
Percentage of Assets sm:A100SeniorSecuredNotesDue20250.0

sm:A150SeniorSecuredConvertibleNotesDue2021


Long
Period End2020-09-30
Value62
Percentage of LongTermDebtNoncurrent2.9
Percentage of Assets1.2
Percentage of Assets sm:A150SeniorSecuredConvertibleNotesDue20210.0

sm:A50SeniorUnsecuredNotesDue2024


Long
Period End2020-09-302019-12-31
Value313496
Percentage of LongTermDebtNoncurrent14.419.0
Percentage of Assets6.17.9
Percentage of Assets sm:A50SeniorUnsecuredNotesDue20240.00.0

sm:A5625SeniorUnsecuredNotesDue2025


Long
Period End2020-09-302019-12-31
Value346495
Percentage of LongTermDebtNoncurrent15.919.0
Percentage of Assets6.87.9
Percentage of Assets sm:A5625SeniorUnsecuredNotesDue20250.00.0

sm:A6125SeniorUnsecuredNotesDue2022


Long
Period End2020-09-302019-12-31
Value230473
Percentage of LongTermDebtNoncurrent10.618.2
Percentage of Assets4.57.5
Percentage of Assets sm:A6125SeniorUnsecuredNotesDue20220.00.0

sm:A6625SeniorUnsecuredNotesDue2027


Long
Period End2020-09-302019-12-31
Value411493
Percentage of LongTermDebtNoncurrent18.918.9
Percentage of Assets8.07.8
Percentage of Assets sm:A6625SeniorUnsecuredNotesDue20270.00.0

sm:A675SeniorUnsecuredNotesDue2026


Long
Period End2020-09-302019-12-31
Value415494
Percentage of LongTermDebtNoncurrent19.118.9
Percentage of Assets8.17.9
Percentage of Assets sm:A675SeniorUnsecuredNotesDue20260.00.0

sm:SeniorSecuredNotes


Long
Period End2020-09-30
Value457
Percentage of LongTermDebtNoncurrent21.0
Percentage of Assets8.9
Percentage of Assets sm:SeniorSecuredNotes0.0

sm:SeniorUnsecuredNotes


Long
Period End2020-09-302019-12-31
Value17172610
Percentage of LongTermDebtNoncurrent79.0100.0
Percentage of Assets33.541.5
Percentage of Assets sm:SeniorUnsecuredNotes0.00.0

Unsecured Long Term Debt

us-gaap:UnsecuredLongTermDebt

us-gaap:UnsecuredLongTermDebt


Unsecured
Period End2021-06-302021-03-312020-12-31
Value167116611660
Percentage of UnsecuredLongTermDebt100.0100.0100.0
Percentage of Assets33.133.133.4

us-gaap:UnsecuredLongTermDebt us-gaap:DebtInstrument

sm:A50SeniorUnsecuredNotesDue2024


Unsecured
Period End2021-06-302021-03-312020-12-31
Value104275275
Percentage of UnsecuredLongTermDebt6.216.616.6
Percentage of Assets2.15.55.5
Percentage of Assets sm:A50SeniorUnsecuredNotesDue20240.00.00.0

sm:A5625SeniorUnsecuredNotesDue2025


Unsecured
Period End2021-06-302021-03-312020-12-31
Value346346346
Percentage of UnsecuredLongTermDebt20.720.920.9
Percentage of Assets6.96.97.0
Percentage of Assets sm:A5625SeniorUnsecuredNotesDue20250.00.00.0

sm:A6125SeniorUnsecuredNotesDue2022


Unsecured
Period End2021-03-312020-12-31
Value211211
Percentage of UnsecuredLongTermDebt12.712.7
Percentage of Assets4.24.3
Percentage of Assets sm:A6125SeniorUnsecuredNotesDue20220.00.0

sm:A65SeniorUnsecuredNotesDue2028


Unsecured
Period End2021-06-30
Value392
Percentage of UnsecuredLongTermDebt23.5
Percentage of Assets7.8
Percentage of Assets sm:A65SeniorUnsecuredNotesDue20280.0

sm:A6625SeniorUnsecuredNotesDue2027


Unsecured
Period End2021-06-302021-03-312020-12-31
Value412412412
Percentage of UnsecuredLongTermDebt24.724.824.8
Percentage of Assets8.28.28.3
Percentage of Assets sm:A6625SeniorUnsecuredNotesDue20270.00.00.0

sm:A675SeniorUnsecuredNotesDue2026


Unsecured
Period End2021-06-302021-03-312020-12-31
Value415415415
Percentage of UnsecuredLongTermDebt24.925.025.0
Percentage of Assets8.28.38.3
Percentage of Assets sm:A675SeniorUnsecuredNotesDue20260.00.00.0

Secured Long Term Debt

us-gaap:SecuredLongTermDebt

us-gaap:SecuredLongTermDebt


Secured
Period End2021-06-302021-03-312020-12-31
Value467464460
Percentage of SecuredLongTermDebt100.0100.0100.0
Percentage of Assets9.39.39.3

us-gaap:SecuredLongTermDebt us-gaap:DebtInstrument

sm:A100SeniorSecuredNotesDue2025


Secured
Period End2021-06-302021-03-312020-12-31
Value402399397
Percentage of SecuredLongTermDebt86.086.186.2
Percentage of Assets8.08.08.0
Percentage of Assets sm:A100SeniorSecuredNotesDue20250.00.00.0

sm:A150SeniorSecuredConvertibleNotesDue2021


Secured
Period End2021-06-302021-03-312020-12-31
Value656463
Percentage of SecuredLongTermDebt14.013.913.8
Percentage of Assets1.31.31.3
Percentage of Assets sm:A150SeniorSecuredConvertibleNotesDue20210.00.00.0

Deferred Income Tax Liabilities Net

us-gaap:DeferredIncomeTaxLiabilitiesNet

us-gaap:DeferredIncomeTaxLiabilitiesNet


Deferred
Period End2020-09-302020-06-302020-03-312019-12-31
Value345793189
Percentage of DeferredIncomeTaxLiabilitiesNet100.0100.0100.0100.0
Percentage of Assets0.71.11.73.0

Other Liabilities Noncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OtherLiabilitiesNoncurrent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value5556565255586163676842454545484745474742444345403639392826252847525766575761671716151713
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.11.11.11.01.01.01.01.01.11.10.70.70.70.70.80.80.70.70.70.70.90.80.80.60.60.60.60.50.50.60.61.01.21.31.61.41.41.61.80.50.50.50.60.6

Operating Lease Liability Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-31
Value1114172023
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0
Percentage of Assets0.20.30.30.40.4

Lessee Operating Lease Liability Payments Due Year Two

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearTwo


Lessee
Period End2020-12-312020-09-30
Value5891000.05920000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearTwo100.0100.0
Percentage of Assets0.10.1

Lessee Operating Lease Liability Payments Due Year Three

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearThree


Lessee
Period End2020-12-312020-09-30
Value3591000.03596000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearThree100.0100.0
Percentage of Assets0.10.1

Lessee Operating Lease Liability Payments Due Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueYearFive


Lessee
Period End2020-12-31
Value1222000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueYearFive100.0
Percentage of Assets0.0

Lessee Operating Lease Liability Payments Due After Year Five

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive


Lessee
Period End2020-12-312020-09-30
Value417000.01640000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive100.0100.0
Percentage of Assets0.00.0

Operating Lease Liability

us-gaap:OperatingLeaseLiability

us-gaap:OperatingLeaseLiability


Operating
Period End2020-12-312020-09-30
Value2326
Percentage of OperatingLeaseLiability100.0100.0
Percentage of Assets0.50.5

Lessee Operating Lease Liability Payments Due

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDue


Lessee
Period End2020-12-312020-09-30
Value2529
Percentage of LesseeOperatingLeaseLiabilityPaymentsDue100.0100.0
Percentage of Assets0.50.6

Lessee Operating Lease Liability Undiscounted Excess Amount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount

us-gaap:LesseeOperatingLeaseLiabilityUndiscountedExcessAmount


Lessee
Period End2020-12-312020-09-30
Value2426000.02856000.0
Percentage of LesseeOperatingLeaseLiabilityUndiscountedExcessAmount100.0100.0
Percentage of Assets0.00.1

Stockholders Equity

us-gaap:StockholdersEquity

us-gaap:StockholdersEquity


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value155217692016218522802341274828432801274329202599273627122394249718522286
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets30.735.340.542.743.341.743.744.143.843.646.041.440.640.738.839.133.035.1

us-gaap:StockholdersEquity us-gaap:StatementEquityComponents

us-gaap:AccumulatedOtherComprehensiveIncome


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value-12.815-13.407-13.598-9.746-10.941-11.129-11.319-11.808-11.998-12.117-12.38-16.038-16.301-16.499-13.789-14.556-13.402-11.312
Percentage of StockholdersEquity-0.8-0.8-0.7-0.4-0.5-0.5-0.4-0.4-0.4-0.4-0.4-0.6-0.6-0.6-0.6-0.6-0.7-0.5
Percentage of Assets-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.2-0.2-0.2
Percentage of Assets us-gaap:AccumulatedOtherComprehensiveIncome0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:AdditionalPaidInCapital


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value1838183318271827182517971791178417791771176517581754174717411716305283
Percentage of StockholdersEquity118.4103.690.783.680.076.765.262.863.564.660.567.664.164.472.768.716.512.4
Percentage of Assets36.436.636.735.734.732.028.527.727.828.227.828.026.026.228.226.85.44.3
Percentage of Assets us-gaap:AdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:CommonStock


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value1.211.1471.1471.1461.1361.131.131.1291.1251.1221.1221.1211.1181.1171.1171.1130.6810.675
Percentage of StockholdersEquity0.10.10.10.10.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonStock0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:RetainedEarnings


Stockholders
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312016-12-312015-12-312014-12-31
Value-274.745-51.71920036546555496710691033982116585699798066579415592013
Percentage of StockholdersEquity-17.7-2.910.016.720.423.735.237.636.935.839.932.936.536.227.831.884.288.1
Percentage of Assets-5.4-1.04.07.18.89.915.416.616.215.618.413.614.814.710.812.427.730.9
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Common Stock Value

us-gaap:CommonStockValue

us-gaap:CommonStockValue


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1210000.01147000.01147000.01146000.01136000.01130000.01130000.01129000.01125000.01122000.01122000.01121000.01118000.01117000.01117000.01116000.01115000.01113000.01113000.0869000.0683000.0681000.0681000.0680000.0676000.0675000.0675000.0674000.0671000.0671000.0671000.0670000.0664000.0663000.0662000.0652000.0642000.0641000.0641000.0638000.0637000.0634000.0629000.0
Percentage of CommonStockValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Additional Paid In Capital Common Stock

us-gaap:AdditionalPaidInCapitalCommonStock

us-gaap:AdditionalPaidInCapitalCommonStock


Additional
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value1838183318271827182517971791178417791771176517581754174717411734172917231716866321312305298299289283273273264257247254242233222234222216223215206191160
Percentage of AdditionalPaidInCapitalCommonStock100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets36.436.636.735.734.732.028.527.727.828.227.828.026.026.228.228.127.826.926.815.06.46.05.44.84.84.44.34.85.55.65.55.25.65.75.65.45.95.85.76.56.76.87.06.8

Retained Earnings Accumulated Deficit

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:RetainedEarningsAccumulatedDeficit


Retained
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-274.745-51.71920036546555496710691033982116585699798066569178690679499410401208155918991900195720131682147614161354134712801203119012571299127412511371114410201042851
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-5.4-1.04.07.18.89.915.416.616.215.618.413.614.814.710.811.212.714.212.417.220.623.227.730.630.629.730.929.729.530.228.828.527.928.028.330.532.533.132.939.735.633.438.036.1

Accumulated Other Comprehensive Income Loss Net Of Tax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax

us-gaap:AccumulatedOtherComprehensiveIncomeLossNetOfTax


Accumulated
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value-12815000.0-13407000.0-13598000.0-9746000.0-10941000.0-11129000.0-11319000.0-11808000.0-11998000.0-12117000.0-12380000.0-16038000.0-16301000.0-16499000.0-13789000.0-15207000.0-14999000.0-15123000.0-14556000.0-14162000.0-13907000.0-13638000.0-13402000.0-12084000.0-12064000.0-11488000.0-11312000.0-4890000.0-5086000.0-5416000.0-5416000.0-7902000.0-8210000.0-8956000.0-9014000.0-5744000.0-5430000.0-5314000.0-4280000.0-6333000.0-10604000.0-14555000.0-15482000.0-37954000.0
Percentage of AccumulatedOtherComprehensiveIncomeLossNetOfTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-0.3-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.2-0.3-0.3-0.2-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.2-0.2-0.2-0.2-0.1-0.1-0.1-0.1-0.2-0.3-0.5-0.6-1.6

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value29610525620111421824120325911817922917114020523526528338135941529933740431428226824322218827011921315678148116153
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax52.725.080.271.567.361.653.952.263.934.845.750.142.636.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-222.322-147.634-128.806-116.643-170.811-139.306-234.588-215.415-320.353-242.935-273.974-308.241-194.978189-209.793-288.12-112.268-534.458-742.764-903.35-487.102-345.533-26.53-388.583-398.887-378.903-373.637-388.539-363.371-331.786-508.006-190.129-293.752-273.023-125.213-153.644-146.85864
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-39.5-34.9-40.2-41.4-100.6-39.3-52.2-55.3-78.7-71.4-69.8-67.2-48.449.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-74.07742-128.054-84.9756-78.821-10.8949.366646-4.319-360.518-3.8360.03.65652-153.258250361379-0.964-0.008-29.043-15.931849011014514124326-0.802-9.75302442.2740.425-188.259
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-13.29.9-40.0-30.133.3-22.3-2.42.416.413.7-1.1-78.7-1.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

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

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect


Cash
Period End2021-06-302021-03-312020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value0.0-0.01-0.0050.005-3.501-2.8996.396-77.951-98.841-439.1-27.431329-127.472-118.106-100.14647
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax0.0-0.0-0.00.0-0.8-0.71.6-22.9-25.2-95.8-6.886.0-37.4-40.10.00.0

Deferred Income Tax Expense Benefit

us-gaap:DeferredIncomeTaxExpenseBenefit

us-gaap:DeferredIncomeTaxExpenseBenefit


Deferred
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-0.162-0.052-33.476-22.796-36.921-99.347-28.2151913-47.00381-36.833-0.86198-124.608-36.668-64.01533-133.873-23.756-95.975-195.039-196.3344.168-50.829-33.72719912435386.936424510-36.943-22.911415-40.46211270-18.174286.8751464
Percentage of DeferredIncomeTaxExpenseBenefit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Operating Activities

us-gaap:NetCashProvidedByUsedInOperatingActivities

us-gaap:NetCashProvidedByUsedInOperatingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value29610525620111421824120325911817922917114020523526528338135941529933740431428226824322218827011921315678148116153
Percentage of NetCashProvidedByUsedInOperatingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax52.725.080.271.567.361.653.952.263.934.845.750.142.636.60.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Income Loss

us-gaap:NetIncomeLoss

us-gaap:NetIncomeLoss


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-222.995-251.269-165.175-98.292-89.252-411.895-102.0554250-177.568309-135.92317317-26.258-89.112-119.90774
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-39.6-59.4-51.6-34.9-52.6-116.3-22.710.812.4-52.278.9-29.74.382.9-7.7-30.30.00.0

us-gaap:NetIncomeLoss us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Net
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-222.995-251.269-98.292-89.252-411.8954250-177.568-135.92317317
Percentage of NetIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-39.6-59.4-34.9-52.6-116.310.812.4-52.2-29.74.382.9
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.0

Share Based Compensation

us-gaap:ShareBasedCompensation

us-gaap:ShareBasedCompensation


Share
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312013-03-312012-12-312012-09-302012-06-302012-03-312011-09-30
Value3.9565.737-0.4384.1645.7125.5615.566.7666.1545.8386.2287.0045.2645.4126.546.3474.3585.4558.1138.4549.3598.0224.357.713
Percentage of ShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Net Cash Provided By Used In Investing Activities

us-gaap:NetCashProvidedByUsedInInvestingActivities

us-gaap:NetCashProvidedByUsedInInvestingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-222.322-147.634-128.806-116.643-170.811-139.306-234.588-215.415-320.353-242.935-273.974-308.241-194.978189-209.793-288.12-112.268-534.458-742.764-903.35-487.102-345.533-26.53-388.583-398.887-378.903-373.637-388.539-363.371-331.786-508.006-190.129-293.752-273.023-125.213-153.644-146.85864
Percentage of NetCashProvidedByUsedInInvestingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-39.5-34.9-40.2-41.4-100.6-39.3-52.2-55.3-78.7-71.4-69.8-67.2-48.449.40.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Net Cash Provided By Used In Financing Activities

us-gaap:NetCashProvidedByUsedInFinancingActivities

us-gaap:NetCashProvidedByUsedInFinancingActivities


Net
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-74.07742-128.054-84.9756-78.821-10.8949.366646-4.319-360.518-3.8360.03.65652-153.258250361379-0.964-0.008-29.043-15.931849011014514124326-0.802-9.75302442.2740.425-188.259
Percentage of NetCashProvidedByUsedInFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of RevenueFromContractWithCustomerIncludingAssessedTax-13.29.9-40.0-30.133.3-22.3-2.42.416.413.7-1.1-78.7-1.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Payments Of Dividends Common Stock

us-gaap:PaymentsOfDividendsCommonStock

us-gaap:PaymentsOfDividendsCommonStock


Payments
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302013-12-312013-09-302012-12-312012-09-302011-12-312011-09-302010-12-312010-09-30
Value1.1460.05.6420.05.6070.05.5810.04.3470.03.3990.03.3490.03.3030.03.2010.03.1530.0
Percentage of PaymentsOfDividendsCommonStock100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0

Debt Instrument Interest Rate Stated Percentage

us-gaap:DebtInstrumentInterestRateStatedPercentage us-gaap:DebtInstrument

us-gaap:DebtInstrumentInterestRateStatedPercentage

sm:A100SeniorSecuredNotesDue2025


Debt
Period End2020-09-302020-06-30
Value10.00.1
Percentage of DebtInstrumentInterestRateStatedPercentage100.0100.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations sm:A100SeniorSecuredNotesDue20250.00.0

sm:A150SeniorSecuredConvertibleNotesDue2021


Debt
Period End2020-09-302020-06-30
Value1.50.015
Percentage of DebtInstrumentInterestRateStatedPercentage15.015.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations sm:A150SeniorSecuredConvertibleNotesDue20210.00.0

sm:A50SeniorUnsecuredNotesDue2024


Debt
Period End2020-09-302020-06-30
Value5.00.05
Percentage of DebtInstrumentInterestRateStatedPercentage50.050.0
Percentage of LongTermDebtAndCapitalLeaseObligations0.00.0
Percentage of LongTermDebtAndCapitalLeaseObligations sm:A50SeniorUnsecuredNotesDue20240.00.0

Effective Income Tax Rate Continuing Operations

us-gaap:EffectiveIncomeTaxRateContinuingOperations

us-gaap:EffectiveIncomeTaxRateContinuingOperations


Effective
Period End2021-06-302020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.1-0.818.90.2910.1940.030.2760.2120.206-0.0160.213-0.0550.2380.2040.3060.3720.3740.0090.3670.3620.359-0.0414.0350.4140.38700.3740.3760.3720.010.3750.3760.383-0.0250.3720.3730.373-0.0020.3670.3690.374-0.0020.3770.408
Percentage of EffectiveIncomeTaxRateContinuingOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Net

us-gaap:DeferredTaxAssetsNet

us-gaap:DeferredTaxAssetsNet


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value933234652102762191391729299
Percentage of DeferredTaxAssetsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Deferred Tax Assets Valuation Allowance

us-gaap:DeferredTaxAssetsValuationAllowance

us-gaap:DeferredTaxAssetsValuationAllowance


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value133.073.0832.9785.335107.2465.0015.3153.7912.164
Percentage of DeferredTaxAssetsValuationAllowance100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:CashPortionOfGainLossOnDerivativeInstrument

sm:CashPortionOfGainLossOnDerivativeInstrument


Cash
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-158.822-107.88564701427315244.09-4.969-33.892-40.718-36.665-24.528-8.16813160.007
Percentage of CashPortionOfGainLossOnDerivativeInstrument100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:ChangeInCapitalExpendituresIncurredButNotYetPaid

sm:ChangeInCapitalExpendituresIncurredButNotYetPaid


Change
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value379.4411-45.69816-59.16744-72.28262-22.585-42.3561.868604.521-41.98217279.331-4.273
Percentage of ChangeInCapitalExpendituresIncurredButNotYetPaid100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:DebtInstrumentRepurchaseDiscount us-gaap:DebtInstrument

sm:DebtInstrumentRepurchaseDiscount

sm:A6125SeniorUnsecuredNotesDue2022And50SeniorUnsecuredNotesDue2024


Debt
Period End2020-09-30
Value25
Percentage of DebtInstrumentRepurchaseDiscount100.0

sm:DebtInstrumentRepurchasePremium us-gaap:DebtInstrument

sm:DebtInstrumentRepurchasePremium

sm:A6125SeniorUnsecuredNotesDue2022And50SeniorUnsecuredNotesDue2024


Debt
Period End2021-06-30
Value600000.0
Percentage of DebtInstrumentRepurchasePremium100.0

sm:Derivativesettlementgainorloss

sm:Derivativesettlementgainorloss


Derivativesettlementgainorloss
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value158107-64.991-70.305-142.528-73.437-15.379-24.722-4.094.9693340-36.665-24.5288.168-13.092160.007
Percentage of Derivativesettlementgainorloss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:Derivativesettlementgainorloss us-gaap:DerivativeInstrumentRisk

sm:GasContracts


Derivativesettlementgainorlossus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value12404.677-0.896-1.054-14.625-9.264-12.21-5.6684.134170.802-0.7576.41-24.512-24.0882117
Percentage of Derivativesettlementgainorloss7.737.5-7.21.30.719.960.249.4138.683.252.82.02.1-26.1-300.1184.0133.4250085.7

sm:NGLContracts


Derivativesettlementgainorlossus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value12110.796-0.502-2.868-5.23-11.496-14.758-9.111-0.5349.12823-11.478-10.19158.524-2.694-8.415
Percentage of Derivativesettlementgainorloss7.710.3-1.20.72.07.174.859.7222.8-10.726.956.831.341.5193.6-65.1-16.5-120214.3

sm:OilContracts


Derivativesettlementgainorlossus-gaap:
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value13456-70.464-68.907-138.606-53.5825.3812.246101.3696.88416-24.43-20.748162.472-2.754-9.084
Percentage of Derivativesettlementgainorloss84.652.2108.498.097.273.0-35.0-9.1-261.327.620.341.366.684.6206.5-18.9-16.9-129771.4

sm:GainsLossesonExtinguishmentofDebtNonCashPortion us-gaap:DebtInstrument, us-gaap:ExtinguishmentOfDebt

sm:GainsLossesonExtinguishmentofDebtNonCashPortion

sm:A6125SeniorUnsecuredNotesDue2022And50SeniorUnsecuredNotesDue2024, sm:AcceleratedUnamortizedDeferredFinancingCosts


Gains
Period End2020-09-30
Value0.48
Percentage of GainsLossesonExtinguishmentofDebtNonCashPortion100.0

sm:ImpairmentofProvedOilandGasProperties

sm:ImpairmentofProvedOilandGasProperties


Impairmentof
Period End2020-12-312020-09-302020-06-302020-03-312019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value0.00.00.09560.00.00.00.00.00.00.00.03.8060.0768.0490.0269344551255
Percentage of ImpairmentofProvedOilandGasProperties0.00.00.0100.00.00.00.00.00.00.00.00.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0

sm:ImpairmentofUnprovedOilandGasProperties

sm:ImpairmentofUnprovedOilandGasProperties


Impairmentof
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
Value8.88.88.78.88.8338.7086.337126.338239.055115.625
Percentage of ImpairmentofUnprovedOilandGasProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:LetterofCreditDividendRestrictionsAmount us-gaap:CreditFacility, us-gaap:LongtermDebtType

sm:LetterofCreditDividendRestrictionsAmount

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Letterof
Period End2020-09-302020-06-302020-03-31
Value121250
Percentage of LetterofCreditDividendRestrictionsAmount100.0100.0100.0

sm:NonmonetaryTradeAcreageExchanged

sm:NonmonetaryTradeAcreageExchanged


Nonmonetary
Period End2020-12-312019-12-31
Value0100.0
Percentage of NonmonetaryTradeAcreageExchanged0.0100.0

sm:RestrictedStockSharesSettledGrossOfSharesForTaxWithholdings us-gaap:AwardType, us-gaap:SubsequentEventType

sm:RestrictedStockSharesSettledGrossOfSharesForTaxWithholdings

us-gaap:RestrictedStockUnitsRSU, us-gaap:SubsequentEvent


Restricted
Period End2021-07-01
Value349330.0
Percentage of RestrictedStockSharesSettledGrossOfSharesForTaxWithholdings100.0

sm:StockIssuedDuringPeriodSharesRestrictedStockUnitsAndPerformanceShareUnits us-gaap:StatementEquityComponents

sm:StockIssuedDuringPeriodSharesRestrictedStockUnitsAndPerformanceShareUnits

us-gaap:CommonStock


Stock
Period End2020-09-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-30
Value1019500.0730.0331530.0290.02579.0290580.01161.0
Percentage of StockIssuedDuringPeriodSharesRestrictedStockUnitsAndPerformanceShareUnits100.0100.0100.0100.0100.0100.0100.0

sm:StockIssuedDuringPeriodValueRestrictedStockUnitsAndPerformanceShareUnits

sm:StockIssuedDuringPeriodValueRestrictedStockUnitsAndPerformanceShareUnits


Stock
Period End2020-09-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-31
Value-1557000.0-3000.0-1640000.0-2000.0-18000.0-2965000.0-10000.00-1229000.00-11000.0-13000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockUnitsAndPerformanceShareUnits100.0100.0100.0100.0100.0100.0100.00.0100.00.0100.0100.0

sm:StockIssuedDuringPeriodValueRestrictedStockUnitsAndPerformanceShareUnits us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2020-09-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302017-12-312017-09-302017-06-302017-03-312016-12-31
Value-1567000.0-3000.0-1644000.0-2000.0-18000.0-2968000.0-10000.00-1230000.00-11000.0-13000.0
Percentage of StockIssuedDuringPeriodValueRestrictedStockUnitsAndPerformanceShareUnits100.6100.0100.2100.0100.0100.1100.00.0100.10.0100.0100.0

us-gaap:CommonStock


Stock
Period End2020-09-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302017-12-312017-09-302016-12-31
Value10000.004000.0003000.0001000.00
Percentage of StockIssuedDuringPeriodValueRestrictedStockUnitsAndPerformanceShareUnits-0.6-0.0-0.2-0.0-0.0-0.1-0.00.0-0.1-0.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalOther

us-gaap:AdjustmentsToAdditionalPaidInCapitalOther


Adjustments
Period End2020-09-302019-06-302017-12-312017-09-302017-06-302017-03-31
Value-88000.00-18000.0-4000.00-98000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalOther100.00.0100.0100.00.0100.0

us-gaap:AdjustmentsToAdditionalPaidInCapitalOther us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Adjustments
Period End2020-09-302019-06-302017-12-312017-09-302017-06-302017-03-31
Value-88000.0-1000.0-18000.0-4000.00-98000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalOther100.00.0100.0100.00.0100.0

us-gaap:AmortizationOfFinancingCostsAndDiscounts

us-gaap:AmortizationOfFinancingCostsAndDiscounts


Amortization
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value4.7224.7234.624.5064.5863.9923.923.9213.8443.7893.7163.7923.8843.8663.7983.7993.7334.9464.2513.7572.85-0.921.9071.9111.9351.9571.7131.4791.4771.4771.4761.4741.3631.0771.0771.0760.9513.6653.6013.4047.6743.623.4423.3653.3663.291
Percentage of AmortizationOfFinancingCostsAndDiscounts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CommonStockDividendsPerShareCashPaid

us-gaap:CommonStockDividendsPerShareCashPaid


Common
Period End2021-06-30
Value0.01
Percentage of CommonStockDividendsPerShareCashPaid100.0

us-gaap:CommonStockDividendsPerShareDeclared

us-gaap:CommonStockDividendsPerShareDeclared


Common
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value00.0100.0100.0100.0500.0500.0500.0500.0500.0500.0500.0500.0500.0500.0500.0500.0500.0500.0500.0500.0500.0500.0500.05
Percentage of CommonStockDividendsPerShareDeclared0.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.00.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

us-gaap:ConcentrationRiskPercentage1

us-gaap:SalesRevenueNet, us-gaap:GeographicConcentrationRisk


Concentration
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
Value100.0100.0100.01.01.01.01.01.01.01.01.01.01.01.0
Percentage of ConcentrationRiskPercentage1100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConcentrationRiskPercentage1 us-gaap:StatementGeographical, us-gaap:ConcentrationRiskByBenchmark, us-gaap:ConcentrationRiskByType

sm:MidlandBasin, us-gaap:SalesRevenueNet, us-gaap:GeographicConcentrationRisk


Concentration
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value81.081.077.00.740.810.760.750.710.68
Percentage of ConcentrationRiskPercentage181.081.077.074.081.076.075.071.068.0

sm:SouthTexas, us-gaap:SalesRevenueNet, us-gaap:GeographicConcentrationRisk


Concentration
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-30
Value19.019.023.00.260.190.240.250.290.32
Percentage of ConcentrationRiskPercentage119.019.023.026.019.024.025.029.032.0

us-gaap:CurrentStateAndLocalTaxExpenseBenefit

us-gaap:CurrentStateAndLocalTaxExpenseBenefit


Current
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
Value0.00.1580.047-0.1730.2360.3390.5090.32-0.1760.9650.9920.085-0.040.6251.7650.23-2.4393.8421.2740.0240.0770.164-0.521-8.308100.274-0.6120.4790.5120.4891.819-0.0460.2460.102-0.0650.174-0.1320.3930.5170.6370.2240.1750.0510.277-0.021
Percentage of CurrentStateAndLocalTaxExpenseBenefit0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 sm:DebtInstrumentBorrowingBaseUtilizationPercentage, us-gaap:CreditFacility, us-gaap:LongtermDebtType, us-gaap:VariableRate

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1

sm:BorrowingBaseUtilizationOf25PercentOrMoreButLessThan50Percent, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:Eurodollar


Debt
Period End2020-09-302020-06-30
Value2.00.02
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0100.0

sm:BorrowingBaseUtilizationOf25PercentOrMoreButLessThan50Percent, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:PrimeRate


Debt
Period End2020-09-302020-06-30
Value1.00.01
Percentage of DebtInstrumentBasisSpreadOnVariableRate150.050.0

sm:BorrowingBaseUtilizationOf50PercentOrMoreButLessThan75Percent, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:Eurodollar


Debt
Period End2020-09-302020-06-30
Value2.50.025
Percentage of DebtInstrumentBasisSpreadOnVariableRate1125.0125.0

sm:BorrowingBaseUtilizationOf50PercentOrMoreButLessThan75Percent, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:PrimeRate


Debt
Period End2020-09-302020-06-30
Value1.50.015
Percentage of DebtInstrumentBasisSpreadOnVariableRate175.075.0

sm:BorrowingBaseUtilizationOf75PercentOrMoreButLessThan90Percent, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:Eurodollar


Debt
Period End2020-09-302020-06-30
Value2.750.0275
Percentage of DebtInstrumentBasisSpreadOnVariableRate1137.5137.5

sm:BorrowingBaseUtilizationOf75PercentOrMoreButLessThan90Percent, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:PrimeRate


Debt
Period End2020-09-302020-06-30
Value1.750.0175
Percentage of DebtInstrumentBasisSpreadOnVariableRate187.587.5

sm:BorrowingBaseUtilizationOf90PercentOrMore, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:Eurodollar


Debt
Period End2020-09-302020-06-30
Value3.00.03
Percentage of DebtInstrumentBasisSpreadOnVariableRate1150.0150.0

sm:BorrowingBaseUtilizationOf90PercentOrMore, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:PrimeRate


Debt
Period End2020-09-302020-06-30
Value2.00.02
Percentage of DebtInstrumentBasisSpreadOnVariableRate1100.0100.0

sm:BorrowingBaseUtilizationOfLessThan25Percent, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:Eurodollar


Debt
Period End2020-09-302020-06-30
Value1.750.0175
Percentage of DebtInstrumentBasisSpreadOnVariableRate187.587.5

sm:BorrowingBaseUtilizationOfLessThan25Percent, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:PrimeRate


Debt
Period End2020-09-302020-06-30
Value0.750.0075
Percentage of DebtInstrumentBasisSpreadOnVariableRate137.537.5

us-gaap:DebtInstrumentBasisSpreadOnVariableRate1 sm:DebtInstrumentBorrowingBaseUtilizationPercentage, us-gaap:LongtermDebtType, us-gaap:VariableRate

sm:BorrowingBaseUtilizationOf25PercentOrMoreButLessThan50Percent, us-gaap:LineOfCredit, us-gaap:Eurodollar


Debt
Period End2020-12-31
Value2.0
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.0

sm:BorrowingBaseUtilizationOf25PercentOrMoreButLessThan50Percent, us-gaap:LineOfCredit, us-gaap:PrimeRate


Debt
Period End2020-12-31
Value1.0
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.0

sm:BorrowingBaseUtilizationOf50PercentOrMoreButLessThan75Percent, us-gaap:LineOfCredit, us-gaap:Eurodollar


Debt
Period End2020-12-31
Value2.5
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.0

sm:BorrowingBaseUtilizationOf50PercentOrMoreButLessThan75Percent, us-gaap:LineOfCredit, us-gaap:PrimeRate


Debt
Period End2020-12-31
Value1.5
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.0

sm:BorrowingBaseUtilizationOf75PercentOrMoreButLessThan90Percent, us-gaap:LineOfCredit, us-gaap:Eurodollar


Debt
Period End2020-12-31
Value2.75
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.0

sm:BorrowingBaseUtilizationOf75PercentOrMoreButLessThan90Percent, us-gaap:LineOfCredit, us-gaap:PrimeRate


Debt
Period End2020-12-31
Value1.75
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.0

sm:BorrowingBaseUtilizationOf90PercentOrMore, us-gaap:LineOfCredit, us-gaap:Eurodollar


Debt
Period End2020-12-31
Value3.0
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.0

sm:BorrowingBaseUtilizationOf90PercentOrMore, us-gaap:LineOfCredit, us-gaap:PrimeRate


Debt
Period End2020-12-31
Value2.0
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.0

sm:BorrowingBaseUtilizationOfLessThan25Percent, us-gaap:LineOfCredit, us-gaap:Eurodollar


Debt
Period End2020-12-31
Value1.75
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.0

sm:BorrowingBaseUtilizationOfLessThan25Percent, us-gaap:LineOfCredit, us-gaap:PrimeRate


Debt
Period End2020-12-31
Value0.75
Percentage of DebtInstrumentBasisSpreadOnVariableRate10.0

us-gaap:DebtInstrumentConvertibleConversionRatio1 us-gaap:DebtInstrument

us-gaap:DebtInstrumentConvertibleConversionRatio1

sm:A150SeniorSecuredConvertibleNotesDue2021


Debt
Period End2021-03-31
Value24.691
Percentage of DebtInstrumentConvertibleConversionRatio1100.0

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses

us-gaap:DefinedBenefitPlanAmortizationOfGainsLosses


Defined
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
Value-237000.0-238000.0-235000.0-240000.0-240000.0-239000.0-147000.0-332000.0-332000.0-331000.0-340000.0-324000.0-324000.0-324000.0-253000.0-396000.0-395000.0-396000.0-419000.0-372000.0-372000.0-371000.0-571000.0-172000.0-173000.0-172000.0-38000.0-306000.0-305000.0-306000.0-414000.0-197000.0-163000.0-197000.0-293000.0-101000.0-101000.0-102000.0-111000.0
Percentage of DefinedBenefitPlanAmortizationOfGainsLosses100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit

us-gaap:DefinedBenefitPlanAmortizationOfPriorServiceCostCredit


Defined
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
Value4000.04000.05000.04000.04000.04000.05000.04000.05000.04000.05000.04000.04000.04000.05000.04000.03000.04000.05000.04000.04000.04000.05000.04000.04000.04000.05000.04000.04000.04000.05000.04000.04000.04000.09000.00000
Percentage of DefinedBenefitPlanAmortizationOfPriorServiceCostCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.0

us-gaap:DefinedBenefitPlanContributionsByEmployer us-gaap:SubsequentEventType

us-gaap:DefinedBenefitPlanContributionsByEmployer

us-gaap:SubsequentEvent


Defined
Period End2020-10-29
Value5.9
Percentage of DefinedBenefitPlanContributionsByEmployer100.0

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets

us-gaap:DefinedBenefitPlanExpectedReturnOnPlanAssets


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value434000.0434000.0474000.0393000.0394000.0393000.0321000.0466000.0465000.0466000.0370000.0561000.0561000.0561000.0563000.0559000.0558000.0559000.0573000.0545000.0545000.0546000.0597000.0494000.0495000.0494000.0604000.0385000.0385000.0384000.0483000.0286000.0307000.0286000.0352000.0220000.0879340.0220.0281000.0159000.0637520.0159.0159000.0
Percentage of DefinedBenefitPlanExpectedReturnOnPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanInterestCost

us-gaap:DefinedBenefitPlanInterestCost


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value590000.0590000.0480000.0698000.0697000.0699000.0739000.0656000.0655000.0657000.0637000.0673000.0672000.0673000.0617000.0727000.0727000.0727000.0830000.0624000.0624000.0624000.0700000.0548000.0548000.0548000.0688000.0407000.0407000.0407000.0468000.0345000.0340000.0345000.0393000.0296000.01183100.0296.0312000.0280000.01119200.0280.0280000.0
Percentage of DefinedBenefitPlanInterestCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost

us-gaap:DefinedBenefitPlanNetPeriodicBenefitCost


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value0.2442.8091.1091.9441.9431.9441.6782.2092.2092.2092.3172.15.1072.11.5812.6182.6172.6182.7942.4422.7912.4423.0691.8141.8131.8141.7221.9051.9041.9052.3181.4921.4371.4921.8581.1274.5056180.0011281.1941.064.237820.001061.06
Percentage of DefinedBenefitPlanNetPeriodicBenefitCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1

us-gaap:DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1


Defined
Period End2020-12-312020-09-30
Value-1227000.0-1282000.0
Percentage of DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1100.0100.0

us-gaap:DefinedBenefitPlanServiceCost

us-gaap:DefinedBenefitPlanServiceCost


Defined
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-30
Value1129000.01129000.0863000.01395000.01396000.01395000.01108000.01683000.01682000.01683000.01705000.01660000.01659000.01660000.01269000.02050000.02050000.02050000.02113000.01987000.01986000.01989000.02390000.01584000.01583000.01584000.01595000.01573000.01573000.01572000.01914000.01232000.01237000.01232000.01515000.0950000.03797200.0950.01052000.0848000.03389500.0848.0848000.0
Percentage of DefinedBenefitPlanServiceCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeNonmonetaryNotionalAmountEnergyMeasure sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeNonmonetaryNotionalAmountEnergyMeasure

sm:IFTennTXZ0, sm:GasSwapsContractYear2


Derivative
Period End2021-06-30
Value513000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure100.0

sm:IfHsc, sm:GasSwapsContractFirstQuarterYear1


Derivative
Period End2020-12-312019-12-31
Value115920009123000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.00.0

sm:IfHsc, sm:GasSwapsContractFourthQuarterYear1


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value1241200012412000124120009327000932700069940003722000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure2419.50.00.00.00.00.00.0

sm:IfHsc, sm:GasSwapsContractSecondQuarterYear1


Derivative
Period End2021-03-312020-12-312020-03-312019-12-31
Value136720001367200041600004160000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.00.00.00.0

sm:IfHsc, sm:GasSwapsContractThirdQuarterYear1


Derivative
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value125750001257500012575000449300044930004493000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure2451.30.00.00.00.00.0

sm:IfHsc, sm:GasSwapsContractYear2


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2893200028932000211190004780000041736000286210000.011773000109630009123000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure5639.80.00.00.00.00.00.00.00.00.0

sm:IfHsc, sm:GasSwapsContracts


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value67591000713700006323100061660000503720002149800026206000394980004883500066331000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.00.00.00.00.00.00.00.00.00.0

sm:WAHA, sm:GasSwapsContractFirstQuarterYear1


Derivative
Period End2020-12-312019-12-31
Value65440003099000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.00.0

sm:WAHA, sm:GasSwapsContractFourthQuarterYear1


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value7627000762700076270004872000487200045160003419000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure1486.70.00.00.00.00.00.0

sm:WAHA, sm:GasSwapsContractSecondQuarterYear1


Derivative
Period End2021-03-312020-12-312020-03-312019-12-31
Value7230000723000035920003196000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.00.00.00.0

sm:WAHA, sm:GasSwapsContractThirdQuarterYear1


Derivative
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value808600080860008086000462800042940003268000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure1576.20.00.00.00.00.0

sm:WAHA, sm:GasSwapsContractYear2


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1408700013716000100660002515500020676000175330004224000497700040340002060000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure2746.00.00.00.00.00.00.00.00.00.0

sm:WAHA, sm:GasSwapsContractYear3


Derivative
Period End2020-09-302020-06-302020-03-31
Value590400026810000.0
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.00.00.0

sm:WAHA, sm:GasSwapsContracts


Derivative
Period End2021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value3665900039553000359310003285700029935000172060007939000113360001390800010809000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeNonmonetaryNotionalAmountEnergyMeasure sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

sm:GDWAHA, sm:GasSwapsContractYear2, us-gaap:SubsequentEvent


Derivative
Period End2020-10-29
Value924000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.0

sm:GDWAHA, sm:GasSwapsContractYear3, us-gaap:SubsequentEvent


Derivative
Period End2020-10-29
Value2911000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.0

sm:GDWAHA, sm:GasSwapsContracts, us-gaap:SubsequentEvent


Derivative
Period End2020-07-30
Value920000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.0

sm:IFWAHA, sm:GasSwapsContractYear2, us-gaap:SubsequentEvent


Derivative
Period End2021-02-17
Value3650000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.0

sm:IfHsc, sm:GasSwapsContractYear2, us-gaap:SubsequentEvent


Derivative
Period End2021-02-172020-10-292019-11-012019-08-02
Value781300012900009725000810000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.00.00.00.0

sm:IfHsc, sm:GasSwapsContractYear3, us-gaap:SubsequentEvent


Derivative
Period End2020-10-29
Value15015000
Percentage of DerivativeNonmonetaryNotionalAmountEnergyMeasure0.0

us-gaap:DividendsCommonStockCash

us-gaap:DividendsCommonStockCash


Dividends
Period End2021-06-302021-03-312020-09-302020-03-312019-09-302019-03-312018-09-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-03-312015-12-312015-03-312014-12-312014-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.0311.1471.1461.135.6435.6125.6075.5840.016-11.1265.5630.0033.43.3723.43.3233.353-0.001-9.5620.0093.17212-9.4410.0033.141
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DividendsCommonStockCash us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Dividends
Period End2021-06-302021-03-312020-09-302020-03-312019-09-302019-03-312018-09-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.0311.1471.1461.135.6435.6125.6075.5840.016-11.1265.5630.003-0.001-9.5620.0093.17212-9.4410.0033.141
Percentage of DividendsCommonStockCash100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EarlyRepaymentOfSeniorDebt

us-gaap:EarlyRepaymentOfSeniorDebt


Early
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-31
Value95650.0280.00.00.00.00.0188440.00.00.00.00.02.3440.00.09.987190.00.03500.0
Percentage of EarlyRepaymentOfSeniorDebt100.0100.00.0100.00.00.00.00.0100.0100.00.00.00.00.00.0100.00.00.0100.0100.00.00.0100.00.0

us-gaap:ExplorationExpense

us-gaap:ExplorationExpense


Exploration
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value8.7149.323118.5479.78711171110111413141316141311231313153719253749342421211620152425221819119.6031221141413
Percentage of ExplorationExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDerivativeInstrumentsNetPretax

us-gaap:GainLossOnDerivativeInstrumentsNetPretax


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-09-302013-06-302013-03-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-370.348-344.689-152.693-63.871-167.2545-101.00210079-177.081411-178.026-63.749-7.529-115.778-80.59955114-129.54728-163.35114123212-80.929154616190-126.469-97.662-39.93385-30.5720.5010.1851.652-6.159-6.843-6.33-1.3752.6948.8479.3292.595
Percentage of GainLossOnDerivativeInstrumentsNetPretax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:GainLossOnDerivativeInstrumentsNetPretax us-gaap:DerivativeInstrumentRisk

sm:GasContracts


Gain
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
Value-61.364-48.92216-31.548-8.261-6.7284.8684.228256.113-14.112-4.309-7.0-9.99196.0686.03844-56.614-62.48924
Percentage of GainLossOnDerivativeInstrumentsNetPretax16.614.2-10.849.44.9-1.2-4.84.232.6-3.5-3.42.411.0132.7-17.1-7.510.938.743.750.038.3168.8

sm:NGLContracts


Gain
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
Value-31.769-29.952-13.723-1.682-7.6899.528-1.07612192.60386-63.304-34.34716-22.107-40.7931020-37.18513-40.089-20.227
Percentage of GainLossOnDerivativeInstrumentsNetPretax8.68.79.02.64.61.71.112.624.0-1.521.035.653.9-218.219.150.619.918.028.747.424.5-142.2

sm:OilContracts


Gain
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-30
Value-277.215-265.815-155.469-30.641-151.25542-104.7948334-185.797338-110.413-22.402-13.966-113.412-45.8743849-35.7620.733-60.773
Percentage of GainLossOnDerivativeInstrumentsNetPretax74.977.1101.848.090.599.5103.883.243.4104.982.462.035.1185.598.056.969.243.227.62.637.2

us-gaap:GainLossOnSaleOfOilAndGasProperty

us-gaap:GainLossOnSaleOfOilAndGasProperty


Gain
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
Value0.00.00.0910.00.5390.00.2620.0611.2610.786393850.537-1.895-167.13337332250-69.0214.5342.41571-35.8020.594-5.4322.5262.958
Percentage of GainLossOnSaleOfOilAndGasProperty0.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ImpairmentOfOilAndGasProperties

us-gaap:ImpairmentOfOilAndGasProperties


Impairment
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302010-12-312010-09-30
Value8.758.758.758.758.759898.756.337126.338239.055115.625120.00.00.0551255840.00.02.8011105.93534211700.0380.142170480.06.1270.0
Percentage of ImpairmentOfOilAndGasProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.0100.00.0

us-gaap:IncreaseDecreaseInOperatingCapital

us-gaap:IncreaseDecreaseInOperatingCapital


Increase
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-09-30
Value-82.52951-16.84338189.673-41.61320-17.9975.60916-11.971
Percentage of IncreaseDecreaseInOperatingCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:InterestCostsCapitalized

us-gaap:InterestCostsCapitalized


Interest
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-31
Value4.74.34.24.84.12.74.44.25.04.94.95.26.04.5
Percentage of InterestCostsCapitalized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LeaseCost

us-gaap:LeaseCost


Lease
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value4749627220107139175
Percentage of LeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage sm:DebtInstrumentBorrowingBaseUtilizationPercentage, us-gaap:CreditFacility, us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage

sm:BorrowingBaseUtilizationOf25PercentOrMoreButLessThan50Percent, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Line
Period End2020-09-302020-06-30
Value0.3750.00375
Percentage of LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage100.0100.0

sm:BorrowingBaseUtilizationOf50PercentOrMoreButLessThan75Percent, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Line
Period End2020-09-302020-06-30
Value0.50.005
Percentage of LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage133.3133.3

sm:BorrowingBaseUtilizationOf75PercentOrMoreButLessThan90Percent, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Line
Period End2020-09-302020-06-30
Value0.50.005
Percentage of LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage133.3133.3

sm:BorrowingBaseUtilizationOf90PercentOrMore, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Line
Period End2020-09-302020-06-30
Value0.50.005
Percentage of LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage133.3133.3

sm:BorrowingBaseUtilizationOfLessThan25Percent, us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Line
Period End2020-09-302020-06-30
Value0.3750.00375
Percentage of LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage100.0100.0

us-gaap:LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage sm:DebtInstrumentBorrowingBaseUtilizationPercentage, us-gaap:LongtermDebtType

sm:BorrowingBaseUtilizationOf25PercentOrMoreButLessThan50Percent, us-gaap:LineOfCredit


Line
Period End2020-12-312018-12-31
Value0.3750
Percentage of LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage0.00.0

sm:BorrowingBaseUtilizationOf50PercentOrMoreButLessThan75Percent, us-gaap:LineOfCredit


Line
Period End2020-12-312018-12-31
Value0.50
Percentage of LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage0.00.0

sm:BorrowingBaseUtilizationOf75PercentOrMoreButLessThan90Percent, us-gaap:LineOfCredit


Line
Period End2020-12-312018-12-31
Value0.50
Percentage of LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage0.00.0

sm:BorrowingBaseUtilizationOf90PercentOrMore, us-gaap:LineOfCredit


Line
Period End2020-12-312018-12-31
Value0.50
Percentage of LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage0.00.0

sm:BorrowingBaseUtilizationOfLessThan25Percent, us-gaap:LineOfCredit


Line
Period End2020-12-312018-12-31
Value0.3750
Percentage of LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage0.00.0

us-gaap:NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1

us-gaap:NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1


Noncash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312014-06-302013-09-30
Value0.06.50.00.02.6344.220.8650.0950.00.0255240.00.00.00.7336.225
Percentage of NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed10.0100.00.00.0100.0100.0100.0100.00.0100.00.00.0100.0100.00.00.00.0100.0100.0100.0

us-gaap:OperatingLeaseCost

us-gaap:OperatingLeaseCost


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value3.3293.3644.4536.8346.7688.344118.979
Percentage of OperatingLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePayments

us-gaap:OperatingLeasePayments


Operating
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value2.9723.0093.0193.0463.0453.0633.0142.952
Percentage of OperatingLeasePayments100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLeasePaymentsUse

us-gaap:OperatingLeasePaymentsUse


Operating
Period End2020-12-312019-12-31
Value0.5623.873
Percentage of OperatingLeasePaymentsUse100.0100.0

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent

us-gaap:OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value-592000.0-191000.03852000.0-1195000.0-188000.0-190000.0-489000.0-190000.0-119000.0-263000.0-3657000.0-263000.0-198000.0-260000.0-1418000.0208000.0-124000.0567000.0
Percentage of OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherNoncashIncomeExpense

us-gaap:OtherNoncashIncomeExpense


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value-1.215140.5062.3763.0110.816-4.5111.004-1.2432.53-2.371-0.218-0.2252.527-3.526-2.4462.3-4.567-5.8913.068-0.548-0.128-10.091-4.1041.93-1.496-4.055-1.8411.7243.1030.1542.84-4.737-1.0320.379-1.773-0.2511.1180.0750.0643.8822.0060.9086.022
Percentage of OtherNoncashIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingIncome

us-gaap:OtherOperatingIncome


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
Value1.28200.139-0.997-0.2491.5012.1460.8980.0560.3930.40.2011.8571.34-1.1862.8152.9152.077-0.0571.1070.6260.274-9.0042.1213.0068.421-16.2891.579209.611-47.241181914-35.127131514
Percentage of OtherOperatingIncome100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OtherOperatingIncomeExpenseNet

us-gaap:OtherOperatingIncomeExpenseNet


Other
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-30
Value-1852000.0599000.0-14651000.0-1562000.0-8046000.0-566000.0-19466000.0-1021000.0934000.0-335000.0-4109000.0-9664000.057000.0-4612000.0-7364000.0-999000.0-4251000.0-4859000.0-3041000.05917000.0
Percentage of OtherOperatingIncomeExpenseNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PaymentsForProceedsFromOtherInvestingActivities

us-gaap:PaymentsForProceedsFromOtherInvestingActivities


Payments
Period End2021-06-302021-03-312020-06-302020-03-312019-06-302019-03-312018-03-312017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-292000.071000.000-28000.0-291000.00-514000.0-2486000.03000000.0-900000.01785000.0-885000.0-5000.0-6000.0-1000.0997000.02542000.0-1543000.06484000.0-4227000.0-2650000.0-1431000.02915000.02025000.0-893000.0111000.01439000.0-1550000.0-4001000.0-2015000.002355000.0-2367000.00-8000.06500000.0
Percentage of PaymentsForProceedsFromOtherInvestingActivities100.0100.00.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.00.0100.0100.0

us-gaap:PaymentsOfDebtIssuanceCosts

us-gaap:PaymentsOfDebtIssuanceCosts


Payments
Period End2020-12-312020-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302013-12-312013-09-30
Value0.1832.3950.00.00.00.00.00.03.3880.00.00.0
Percentage of PaymentsOfDebtIssuanceCosts100.0100.00.00.00.00.00.00.0100.00.00.00.0

us-gaap:PaymentsToAcquireOilAndGasPropertyAndEquipment

us-gaap:PaymentsToAcquireOilAndGasPropertyAndEquipment


Payments
Period End2020-12-312019-12-312019-09-302018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302012-12-312012-09-302011-12-312010-12-31
Value0.7980.02.98.684-0.044240.02.507-0.751137521614.1022.707150.8960.5-3.481108536098-0.195-0.4042.8060.1690.2920.0-0.021
Percentage of PaymentsToAcquireOilAndGasPropertyAndEquipment100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0

us-gaap:PaymentsToExploreAndDevelopOilAndGasProperties

us-gaap:PaymentsToExploreAndDevelopOilAndGasProperties


Payments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value222147128109170139235212326249270309421301263258212154137147169176231287429544656539426351432387352381381421370335551419352309179184172132
Percentage of PaymentsToExploreAndDevelopOilAndGasProperties100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromDebtNetOfIssuanceCosts us-gaap:DebtInstrument

us-gaap:ProceedsFromDebtNetOfIssuanceCosts

sm:A65SeniorUnsecuredNotesDue2028


Proceeds
Period End2021-06-23
Value392
Percentage of ProceedsFromDebtNetOfIssuanceCosts100.0

us-gaap:ProceedsFromIncomeTaxRefunds

us-gaap:ProceedsFromIncomeTaxRefunds


Proceeds
Period End2020-07-09
Value7.6
Percentage of ProceedsFromIncomeTaxRefunds100.0

us-gaap:ProceedsFromIssuanceOfCommonStock

us-gaap:ProceedsFromIssuanceOfCommonStock


Proceeds
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302016-12-312016-08-122016-09-302015-12-312015-09-302014-12-312014-09-302013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.5170.01.250.01.3060.00.8850.04055305301.6870.01.9790.4082.4080.7982.880.7722.3950.5331.851.0381.7340.6641.4693.463.3240.22.6480.268
Percentage of ProceedsFromIssuanceOfCommonStock100.00.0100.00.0100.00.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans us-gaap:PlanName

us-gaap:ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans

sm:EmployeeStockPurchasePlan


Proceeds
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302017-12-312017-09-30
Value553000.001200000.001300000.00900000.00
Percentage of ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans100.00.0100.00.0100.00.0100.00.0

us-gaap:ProceedsFromLinesOfCredit

us-gaap:ProceedsFromLinesOfCredit


Proceeds
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5044402813244154254644285241720.00.00.00.00.00.08.53972041582683172683746705607495360.00.022646029322337443277626206130.010225611126177
Percentage of ProceedsFromLinesOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities

us-gaap:ProceedsFromPaymentsForOtherFinancingActivities


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value-14000.0-1631000.0-351000.0-3000.0-2000.0-1640000.0-1026000.0-18000.0-4771000.0-2842000.0-133000.001221000.0-1231000.0-1000.0-160000.0033000.0-30000.0-3000.0-1000.02000.0-99000.0-62000.0-2000.024000.0-101000.0-8000.04000.020000.0-29000.006000.0-574000.0556000.0-213000.0-6000.0-9323000.0-1000.0-643000.0-1185000.0-364000.0-17000.0-527000.0
Percentage of ProceedsFromPaymentsForOtherFinancingActivities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProceedsFromSaleOfOilAndGasPropertyAndEquipment

us-gaap:ProceedsFromSaleOfOilAndGasPropertyAndEquipment


Proceeds
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value0.00.00.0920.00.5390.06.4066.1145.310.984251490-1.6461221744744188111.206220.115313211.99-4.953501.9794040.155164.3076.71233131.67939227583952118.751239
Percentage of ProceedsFromSaleOfOilAndGasPropertyAndEquipment0.00.0100.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RepaymentsOfConvertibleDebt us-gaap:DebtInstrument, us-gaap:SubsequentEventType

us-gaap:RepaymentsOfConvertibleDebt

sm:A150SeniorSecuredConvertibleNotesDue2021, us-gaap:SubsequentEvent


Repayments
Period End2021-07-01
Value65
Percentage of RepaymentsOfConvertibleDebt100.0

us-gaap:RepaymentsOfLinesOfCredit

us-gaap:RepaymentsOfLinesOfCredit


Repayments
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value5863983663392944764714174531250.00.00.00.00.00.08.53972044882302262503129653099731460.00.02544606951332622657392.0206130.015021010926365
Percentage of RepaymentsOfLinesOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings us-gaap:SubsequentEventType

us-gaap:RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings

us-gaap:SubsequentEvent


Restricted
Period End2021-04-29
Value3083400.0
Percentage of RestrictedStockSharesIssuedNetOfSharesForTaxWithholdings100.0

us-gaap:ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion

us-gaap:ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion


Results
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-30
Value204166188181180233228211206177181201151130131134153137171193211214240243219217219183187177202195
Percentage of ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability

us-gaap:RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability


Right
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312019-01-01
Value0.00.00.7450.01.3461.3101250
Percentage of RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability0.00.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue

us-gaap:PerformanceShares


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value0.87-0.98-1.1-1.31-1.84-0.8-0.490.24
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value-0.33-1.78-0.67-2.05-2.8-2.12.990.35
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue-37.9181.660.9156.5152.2262.5-610.2145.8

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue

us-gaap:PerformanceShares


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value00.0100-0.020.175.490.07
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue0.0100.00.00.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-31
Value00.010-0.01-0.02-0.310.10
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue0.0100.00.00.0100.0-182.41.80.0

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod us-gaap:AwardType, us-gaap:SubsequentEventType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod

us-gaap:PerformanceShares, us-gaap:SubsequentEvent


Share
Period End2020-07-012019-07-01
Value0.485060.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod100.00.0

us-gaap:RestrictedStockUnitsRSU, us-gaap:SubsequentEvent


Share
Period End2021-07-012020-07-012019-07-01
Value0.2500090.4205620.33153
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod0.086.70.0

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent us-gaap:PlanName

us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent

sm:EmployeeStockPurchasePlan


Sharebased
Period End2020-12-31
Value0
Percentage of SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent0.0

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation us-gaap:AwardType

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation

us-gaap:PerformanceShares


Shares
Period End2020-12-312016-12-312015-12-312014-12-312013-12-312013-07-25
Value0.00.00.00.00.00.20005
Percentage of SharesPaidForTaxWithholdingForShareBasedCompensation0.00.00.00.00.0100.0

us-gaap:SharesPaidForTaxWithholdingForShareBasedCompensation us-gaap:AwardType, us-gaap:SubsequentEventType

us-gaap:PerformanceShares, us-gaap:SubsequentEvent


Shares
Period End2020-07-012016-07-272015-07-222014-07-23
Value0.2154510.0148090.1006830.045042
Percentage of SharesPaidForTaxWithholdingForShareBasedCompensation0.00.00.00.0

us-gaap:RestrictedStockUnitsRSU, us-gaap:SubsequentEvent


Shares
Period End2021-07-012020-07-012016-07-272015-07-222014-07-23
Value0.0993190.1665260.0700470.0729090.078899
Percentage of SharesPaidForTaxWithholdingForShareBasedCompensation0.00.00.00.00.0

us-gaap:ShortTermLeaseCost

us-gaap:ShortTermLeaseCost


Short
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value35273643-8.50372102134
Percentage of ShortTermLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans us-gaap:PlanName

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans

sm:EmployeeStockPurchasePlan


Stock
Period End2020-09-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-06-30
Value0130790.00184080.099215.00100250.062987.00123680.077282.0140850.0
Percentage of StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans0.0100.00.0100.0100.00.0100.0100.00.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans us-gaap:StatementEquityComponents

us-gaap:CommonStock


Stock
Period End2021-06-302020-06-302019-06-302018-06-302017-12-312017-09-302011-12-312011-09-302010-12-312010-09-30
Value252660.0297010.0184080.0100250.062987.0018985.0025492.00
Percentage of StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans0.00.0100.0100.0100.00.00.00.00.00.0

us-gaap:StockIssuedDuringPeriodSharesOther us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesOther

us-gaap:CommonStock


Stock
Period End2021-06-30
Value5918100.0
Percentage of StockIssuedDuringPeriodSharesOther100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensation

us-gaap:CommonStock


Stock
Period End2021-06-302020-06-302019-06-302018-06-302011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value57795.0267580.096719.058572.055705.021872.0288540.0183030.014446.0130690.018214.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationGross us-gaap:TitleOfIndividual

us-gaap:StockIssuedDuringPeriodSharesShareBasedCompensationGross

srt:Director


Stock
Period End2021-06-302020-06-302019-06-302018-06-30
Value57795.0267580.096719.058572.0
Percentage of StockIssuedDuringPeriodSharesShareBasedCompensationGross100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan


Stock
Period End2021-06-302020-06-302019-06-302018-06-302017-12-312017-09-302016-12-312011-12-312011-09-302010-12-312010-09-30
Value1315000.0947000.01959000.01881000.0885000.001844000.01179000.0-1000.0871000.00
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan100.0100.0100.0100.0100.00.0100.0100.0100.0100.00.0

us-gaap:StockIssuedDuringPeriodValueEmployeeStockPurchasePlan us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302020-06-302019-06-302018-06-302017-12-312017-09-302016-12-312011-12-312011-09-302010-12-312010-09-30
Value1312000.0944000.01957000.01880000.0884000.001843000.01180000.0-1000.0870000.00
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan99.899.799.999.999.90.099.9100.1100.099.90.0

us-gaap:CommonStock


Stock
Period End2021-06-302020-06-302019-06-302018-06-302017-12-312017-09-302016-12-312011-12-312011-09-302010-12-31
Value3000.03000.02000.01000.01000.001000.0-1000.001000.0
Percentage of StockIssuedDuringPeriodValueEmployeeStockPurchasePlan0.20.30.10.10.10.00.1-0.1-0.00.1

us-gaap:StockIssuedDuringPeriodValueOther us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodValueOther

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-30
Value-0.059
Percentage of StockIssuedDuringPeriodValueOther100.0

us-gaap:CommonStock


Stock
Period End2021-06-30
Value0.059
Percentage of StockIssuedDuringPeriodValueOther-100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.9565.7374.1645.7125.5616.7666.1545.8387.0045.2645.4126.546.3474.3585.4556.412-14.69.0290.8359.7631.9310.6382.7870.268
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StockIssuedDuringPeriodValueShareBasedCompensation us-gaap:StatementEquityComponents

us-gaap:AdditionalPaidInCapital


Stock
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-09-302019-06-302019-03-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-302010-06-302010-03-31
Value3.9555.7374.1645.7095.5616.7666.1535.8387.0045.2645.4126.546.3474.3575.4556.412-14.6019.0290.8359.761.9290.6382.7860.268
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation100.0100.0100.099.9100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.099.9100.0100.0100.0

us-gaap:CommonStock


Stock
Period End2021-06-302020-06-302019-06-302018-06-302017-12-312017-09-302016-12-312011-12-312011-09-302011-06-302011-03-312010-12-312010-09-30
Value0.0010.0030.0010.00.00.00.00.0010.00.00.0030.0020.0
Percentage of StockIssuedDuringPeriodValueShareBasedCompensation0.00.10.00.00.00.00.0-0.00.00.00.00.10.0

us-gaap:VariableLeaseCost

us-gaap:VariableLeaseCost


Variable
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value8.60118212222262631
Percentage of VariableLeaseCost100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:WriteOffOfDeferredDebtIssuanceCost us-gaap:DebtInstrument, us-gaap:ExtinguishmentOfDebt

us-gaap:WriteOffOfDeferredDebtIssuanceCost

sm:A6125SeniorUnsecuredNotesDue2022And50SeniorUnsecuredNotesDue2024, sm:AcceleratedUnamortizedDeferredFinancingCosts


Write
Period End2021-06-30
Value1500000.0
Percentage of WriteOffOfDeferredDebtIssuanceCost100.0

dei:EntityCommonStockSharesOutstanding

dei:EntityCommonStockSharesOutstanding


Entity
Period End2021-07-212021-04-212021-02-042020-10-21
Value121117114114
Percentage of EntityCommonStockSharesOutstanding100.0100.0100.0100.0

sm:AccruedRevenueAndSeveranceTaxPayable

sm:AccruedRevenueAndSeveranceTaxPayable


Accrued
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value1051099460394463
Percentage of AccruedRevenueAndSeveranceTaxPayable100.0100.0100.0100.0100.0100.0100.0

sm:DeferredTaxAssetsDebtDiscountAndDeferredFinancingCosts

sm:DeferredTaxAssetsDebtDiscountAndDeferredFinancingCosts


Deferred
Period End2020-12-31
Value23
Percentage of DeferredTaxAssetsDebtDiscountAndDeferredFinancingCosts100.0

sm:DefinedBenefitPlanAccumulatedUnfundedBenefitObligation

sm:DefinedBenefitPlanAccumulatedUnfundedBenefitObligation


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value312522252220157.7389.1837.7577.125
Percentage of DefinedBenefitPlanAccumulatedUnfundedBenefitObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:DerivativeCalendarMonthAverageRollDifferentialSwapTypeWeightedAverageContractPrice us-gaap:DerivativeInstrumentRisk

sm:DerivativeCalendarMonthAverageRollDifferentialSwapTypeWeightedAverageContractPrice

sm:NYMEXOilCalendarMonthAverageRollDifferentialContractFourthQuarterYear1


Derivative
Period End2021-06-302021-03-312020-09-30
Value-0.16-0.16-1.18
Percentage of DerivativeCalendarMonthAverageRollDifferentialSwapTypeWeightedAverageContractPrice100.0100.0100.0

sm:NYMEXOilCalendarMonthAverageRollDifferentialContractYear2


Derivative
Period End2021-06-302021-03-312020-09-30
Value0.110.11-0.4
Percentage of DerivativeCalendarMonthAverageRollDifferentialSwapTypeWeightedAverageContractPrice-68.8-68.833.9

sm:NYMEXOilCalendarMonthAverageRollDifferentialContractYear3


Derivative
Period End2021-06-30
Value0.39
Percentage of DerivativeCalendarMonthAverageRollDifferentialSwapTypeWeightedAverageContractPrice-243.8

sm:NYMEXOilRollDifferentialSwapContractSecondQuarterYear1


Derivative
Period End2021-03-31
Value-0.16
Percentage of DerivativeCalendarMonthAverageRollDifferentialSwapTypeWeightedAverageContractPrice100.0

sm:DerivativeOilBasisSwapTypeWeightedAverageContractPrice sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk

sm:DerivativeOilBasisSwapTypeWeightedAverageContractPrice

sm:NYMEXWTIICEBrent, sm:OilBasisSwapContractFirstQuarterYear1


Derivative
Period End2020-12-312019-12-31
Value-7.860
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice100.00.0

sm:NYMEXWTIICEBrent, sm:OilBasisSwapContractFourthQuarterYear1


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value-7.86-7.86-7.86-8.01-8.01-8.01-8.01
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.00.0100.00.00.00.00.0

sm:NYMEXWTIICEBrent, sm:OilBasisSwapContractSecondQuarterYear1


Derivative
Period End2021-03-312020-12-312020-03-312019-12-31
Value-7.86-7.86-8.06-8.06
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.0100.00.00.0

sm:NYMEXWTIICEBrent, sm:OilBasisSwapContractThirdQuarterYear1


Derivative
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value-7.86-7.86-7.86-8.01-8.01-8.01
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.00.0100.00.00.00.0

sm:NYMEXWTIICEBrent, sm:OilBasisSwapContractYear2


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-7.78-7.78-7.78-7.86-7.86-7.86-7.86-8.03-8.03-8.03
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.00.099.00.00.00.00.00.00.00.0

sm:NYMEXWTIICEBrent, sm:OilBasisSwapContractYear3


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value-7.78-7.78-7.78-7.78-7.86-7.86-7.86
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.00.00.00.00.00.00.0

sm:WTIHoustonMEHNYMEXWTI, sm:OilBasisSwapContractFirstQuarterYear1


Derivative
Period End2020-12-31
Value0.6
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice-7.6

sm:WTIMidlandNYMEXWTI, sm:OilBasisSwapContractFirstQuarterYear1


Derivative
Period End2020-12-312019-12-31
Value0.79-0.68
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice-10.10.0

sm:WTIMidlandNYMEXWTI, sm:OilBasisSwapContractFourthQuarterYear1


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-31
Value0.710.710.71-0.38-0.38-0.38-0.73
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.00.0-9.00.00.00.00.0

sm:WTIMidlandNYMEXWTI, sm:OilBasisSwapContractSecondQuarterYear1


Derivative
Period End2021-03-312020-12-312020-03-312019-12-31
Value0.810.78-0.62-0.68
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.0-9.90.00.0

sm:WTIMidlandNYMEXWTI, sm:OilBasisSwapContractThirdQuarterYear1


Derivative
Period End2021-06-302021-03-312020-12-312020-06-302020-03-312019-12-31
Value0.750.750.74-0.62-0.62-0.74
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.00.0-9.40.00.00.0

sm:WTIMidlandNYMEXWTI, sm:OilBasisSwapContractYear2


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.151.151.150.750.870.870.59-0.73-0.73-1.03
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.00.0-14.60.00.00.00.00.00.00.0

sm:WTIMidlandNYMEXWTI, sm:OilBasisSwapContractYear3


Derivative
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value1.151.151.1500.330.330.33
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.00.00.00.00.00.00.0

sm:DerivativeOilBasisSwapTypeWeightedAverageContractPrice sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

sm:WTIHoustonMEHNYMEXWTI, sm:OilBasisSwapContractYear2, us-gaap:SubsequentEvent


Derivative
Period End2021-02-17
Value1.25
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.0

sm:WTIMidlandNYMEXWTI, sm:OilBasisSwapContractFirstQuarterToThirdQuarterYear1, us-gaap:SubsequentEvent


Derivative
Period End2021-02-17
Value0.95
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.0

sm:DerivativeOilBasisSwapTypeWeightedAverageContractPrice sm:DerivativeUnderlyingIndex, us-gaap:SubsequentEventType

sm:WTIMidlandNYMEXWTI, us-gaap:SubsequentEvent


Derivative
Period End2020-07-302020-02-19
Value0.211.14
Percentage of DerivativeOilBasisSwapTypeWeightedAverageContractPrice0.00.0

sm:DerivativeOilRollDifferentialSwapTypeWeightedAverageContractPrice us-gaap:DerivativeInstrumentRisk

sm:DerivativeOilRollDifferentialSwapTypeWeightedAverageContractPrice

sm:NYMEXOilRollDifferentialSwapContractFirstQuarterYear1


Derivative
Period End2020-12-31
Value-0.3
Percentage of DerivativeOilRollDifferentialSwapTypeWeightedAverageContractPrice100.0

sm:NYMEXOilRollDifferentialSwapContractFourthQuarterYear1


Derivative
Period End2020-12-31
Value-0.24
Percentage of DerivativeOilRollDifferentialSwapTypeWeightedAverageContractPrice80.0

sm:NYMEXOilRollDifferentialSwapContractSecondQuarterYear1


Derivative
Period End2020-12-31
Value-0.24
Percentage of DerivativeOilRollDifferentialSwapTypeWeightedAverageContractPrice80.0

sm:NYMEXOilRollDifferentialSwapContractThirdQuarterYear1


Derivative
Period End2020-12-31
Value-0.25
Percentage of DerivativeOilRollDifferentialSwapTypeWeightedAverageContractPrice83.3

sm:NYMEXOilRollDifferentialSwapContractYear2


Derivative
Period End2020-12-31
Value-0.04
Percentage of DerivativeOilRollDifferentialSwapTypeWeightedAverageContractPrice13.3

sm:DerivativeOilRollDifferentialSwapTypeWeightedAverageContractPrice us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

sm:NYMEXOilRollDifferentialSwapContractFirstQuarterToFourthQuarterYear1, us-gaap:SubsequentEvent


Derivative
Period End2021-02-17
Value0.3
Percentage of DerivativeOilRollDifferentialSwapTypeWeightedAverageContractPrice0.0

sm:NYMEXOilRollDifferentialSwapContractYear2, us-gaap:SubsequentEvent


Derivative
Period End2021-02-17
Value0.27
Percentage of DerivativeOilRollDifferentialSwapTypeWeightedAverageContractPrice0.0

sm:DerivativeSettlementPayable

sm:DerivativeSettlementPayable


Derivative
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value1.1465.8511.287126.4730.0
Percentage of DerivativeSettlementPayable100.0100.0100.0100.0100.00.0

sm:EarlyTerminationPenaltyforRigContractCancellation us-gaap:OtherCommitments

sm:EarlyTerminationPenaltyforRigContractCancellation

sm:DrillingRigLeasingContracts


Early
Period End2021-06-302021-03-312020-09-30
Value9.7145.7
Percentage of EarlyTerminationPenaltyforRigContractCancellation100.0100.0100.0

sm:EarlyTerminationPenaltyforRigContractCancellation us-gaap:OtherCommitments, us-gaap:SubsequentEventType

sm:DrillingRigLeasingContracts, us-gaap:SubsequentEvent


Early
Period End2021-02-17
Value11
Percentage of EarlyTerminationPenaltyforRigContractCancellation0.0

sm:FairValueAssumptionsMeasurementInput us-gaap:Range, us-gaap:FairValueByLiabilityClass, us-gaap:MeasurementInputType

sm:FairValueAssumptionsMeasurementInput

srt:Maximum, us-gaap:AssetRetirementObligationCosts, us-gaap:MeasurementInputRiskFreeInterestRate


Fair
Period End2020-12-312019-12-312018-12-31
Value12.00.120.12
Percentage of FairValueAssumptionsMeasurementInput100.0100.0100.0

srt:Minimum, us-gaap:AssetRetirementObligationCosts, us-gaap:MeasurementInputRiskFreeInterestRate


Fair
Period End2020-12-312019-12-312018-12-31
Value5.50.0550.055
Percentage of FairValueAssumptionsMeasurementInput45.845.845.8

sm:FairValueAssumptionsMeasurementInput us-gaap:Range, us-gaap:FairValueByMeasurementFrequency, us-gaap:MeasurementInputType, us-gaap:PropertyPlantAndEquipmentByType

srt:Maximum, us-gaap:FairValueMeasurementsNonrecurring, us-gaap:MeasurementInputDiscountRate, us-gaap:OilAndGasProperties


Fair
Period End2020-12-31
Value15.0
Percentage of FairValueAssumptionsMeasurementInput125.0

srt:Minimum, us-gaap:FairValueMeasurementsNonrecurring, us-gaap:MeasurementInputDiscountRate, us-gaap:OilAndGasProperties


Fair
Period End2020-12-31
Value10.0
Percentage of FairValueAssumptionsMeasurementInput83.3

sm:IncomeTaxesRefundAlternativeMinimumTaxCARESAct

sm:IncomeTaxesRefundAlternativeMinimumTaxCARESAct


Income
Period End2020-07-09
Value7600000.0
Percentage of IncomeTaxesRefundAlternativeMinimumTaxCARESAct100.0

sm:IndexPercentOfNaturalGasFixedSwaps sm:DerivativeUnderlyingIndex

sm:IndexPercentOfNaturalGasFixedSwaps

sm:GDWAHA


Index
Period End2021-06-302021-03-312020-09-302020-06-30
Value30.035.036.00.29
Percentage of IndexPercentOfNaturalGasFixedSwaps100.0100.0100.0100.0

sm:GDWaha


Index
Period End2020-12-312020-03-312019-12-312019-09-302019-06-302019-03-312018-12-31
Value41.00.190.080.440.110.120.1
Percentage of IndexPercentOfNaturalGasFixedSwaps0.00.00.00.00.00.00.0

sm:IFWAHA


Index
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-30
Value70.065.059.064.00.710.810.920.56
Percentage of IndexPercentOfNaturalGasFixedSwaps233.3185.70.0177.8244.80.00.00.0

sm:LineofCreditFacilityAggregateLenderCommitments us-gaap:CreditFacility, us-gaap:LongtermDebtType

sm:LineofCreditFacilityAggregateLenderCommitments

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Lineof
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-04-182019-03-312018-12-312018-09-302018-06-302018-04-242018-03-312017-12-31
Value110011001200120012001200120010001000100010001000925925
Percentage of LineofCreditFacilityAggregateLenderCommitments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

sm:LineofCreditFacilityAggregateLenderCommitments us-gaap:CreditFacility, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:SubsequentEvent


Lineof
Period End2020-10-212020-07-232020-04-292020-02-062019-10-242019-07-232019-04-252019-04-182019-02-072018-10-242018-07-252018-04-25
Value110011001100120012001200120012001000100010001000
Percentage of LineofCreditFacilityAggregateLenderCommitments0.00.00.00.00.00.00.0100.00.00.00.00.0

sm:LineofCreditFacilityAggregateLenderCommitments us-gaap:LongtermDebtType

us-gaap:LineOfCredit


Lineof
Period End2020-12-312019-12-31
Value11001200
Percentage of LineofCreditFacilityAggregateLenderCommitments0.0100.0

sm:LineofCreditFacilityAggregateLenderCommitments us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:LineOfCredit, us-gaap:SubsequentEvent


Lineof
Period End2021-02-04
Value1100
Percentage of LineofCreditFacilityAggregateLenderCommitments0.0

sm:LongTermLineOfCreditAndSeniorNotesNoncurrent

sm:LongTermLineOfCreditAndSeniorNotesNoncurrent


Long
Period End2020-09-302019-12-31
Value23532732
Percentage of LongTermLineOfCreditAndSeniorNotesNoncurrent100.0100.0

sm:MultiplierAppliedToPsuAwardsAtSettlement us-gaap:AwardType

sm:MultiplierAppliedToPsuAwardsAtSettlement

us-gaap:PerformanceShares


Multiplier
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302017-12-312016-12-31
Value0.90.9000000.2
Percentage of MultiplierAppliedToPsuAwardsAtSettlement100.0100.00.00.00.00.00.0100.0

sm:PermittedSecondLienDebtRemainingBorrowingCapacity

sm:PermittedSecondLienDebtRemainingBorrowingCapacity


Permitted
Period End2020-12-31
Value380
Percentage of PermittedSecondLienDebtRemainingBorrowingCapacity100.0

sm:PotentialPenaltyfornotMeetingMinimumCompletionServiceArrangementRequirements us-gaap:Range, us-gaap:OtherCommitments

sm:PotentialPenaltyfornotMeetingMinimumCompletionServiceArrangementRequirements

srt:Maximum, sm:CompletionServiceCommitment


Potential
Period End2020-12-312019-12-312019-09-302019-06-30
Value10131415
Percentage of PotentialPenaltyfornotMeetingMinimumCompletionServiceArrangementRequirements100.0100.0100.0100.0

sm:PotentialPenaltyfornotMeetingMinimumDrillingandCompletionRequirements us-gaap:Range

sm:PotentialPenaltyfornotMeetingMinimumDrillingandCompletionRequirements

srt:Maximum


Potential
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value4551263539
Percentage of PotentialPenaltyfornotMeetingMinimumDrillingandCompletionRequirements100.0100.0100.0100.0100.0

sm:RevolvingCreditFacilityAndSeniorNotesNet

sm:RevolvingCreditFacilityAndSeniorNotesNet


Revolving
Period End2020-12-312019-12-31
Value22142732
Percentage of RevolvingCreditFacilityAndSeniorNotesNet100.0100.0

sm:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionValue us-gaap:PlanName

sm:ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionValue

sm:EmployeeStockPurchasePlan


Share
Period End2021-06-30
Value25000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionValue100.0

sm:WarrantsExercised

sm:WarrantsExercised


Warrants
Period End2021-06-30
Value5922300.0
Percentage of WarrantsExercised100.0

sm:WarrantsExercised us-gaap:SubsequentEventType

us-gaap:SubsequentEvent


Warrants
Period End2021-04-29
Value3086100.0
Percentage of WarrantsExercised0.0

sm:WaterDeliveryCommitmentsandContractsRemainingContractualVolume us-gaap:OtherCommitments

sm:WaterDeliveryCommitmentsandContractsRemainingContractualVolume

sm:WaterPipelineCommitment


Water
Period End2020-12-31
Value17.0
Percentage of WaterDeliveryCommitmentsandContractsRemainingContractualVolume100.0

sm:WellsInProgress

sm:WellsInProgress


Wells
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value15329123322626622411832525734529532836140532128728618623520141546638745241945950363749527727930129027326427421327332924518314565
Percentage of WellsInProgress100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

srt:OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume us-gaap:OilAndGasDeliveryCommitmentsAndContracts

srt:OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume

sm:CrudeOilPipelineCommitment


Oil
Period End2020-12-312019-12-31
Value16.024.0
Percentage of OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume100.0100.0

sm:CrudeOilPipelineCommitmentExcludedfromRemainingDeficiencyPaymentAmount


Oil
Period End2020-12-312019-12-31
Value11.916.5
Percentage of OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume74.468.8

sm:NaturalGasPipelineCommitment


Oil
Period End2020-12-312019-12-31
Value257000.0424000.0
Percentage of OilAndGasDeliveryCommitmentsAndContractsRemainingContractualVolume1606250.01766666.7

us-gaap:AccountsReceivableGrossCurrent us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType

us-gaap:AccountsReceivableGrossCurrent

us-gaap:AccruedIncomeReceivable


Accounts
Period End2021-06-302020-12-31
Value173108
Percentage of AccountsReceivableGrossCurrent100.0100.0

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent

us-gaap:AccrualForTaxesOtherThanIncomeTaxesCurrent


Accrual
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value202418136.6061415
Percentage of AccrualForTaxesOtherThanIncomeTaxesCurrent100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligation

us-gaap:AssetRetirementObligation


Asset
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312011-01-022010-12-312010-01-02
Value858694114123140122121120958282102
Percentage of AssetRetirementObligation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationCurrent

us-gaap:AssetRetirementObligationCurrent


Asset
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2.02.72.30.0750.9323.31.32.56.27.511
Percentage of AssetRetirementObligationCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetRetirementObligationsNoncurrent

us-gaap:AssetRetirementObligationsNoncurrent


Asset
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value8584838786858495959491100100839666108105137118115108120123117115115101118115112908987877372706960
Percentage of AssetRetirementObligationsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment

us-gaap:AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment


Assets
Period End2021-06-302021-03-312020-12-312020-09-302019-12-31
Value6872708285
Percentage of AssetsNoncurrentOtherThanNoncurrentInvestmentsAndPropertyPlantAndEquipment100.0100.0100.0100.0100.0

us-gaap:CapitalizedExploratoryWellCosts

us-gaap:CapitalizedExploratoryWellCosts


Capitalized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312012-09-302011-12-312010-12-312009-12-312008-12-31
Value5.698111149191143349.1591835349.437
Percentage of CapitalizedExploratoryWellCosts100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations


Cash
Period End2020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-312014-12-31
Value0.010.010.010.0150.013.5116.410.01477176615643313441559659120.0180.12
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ContractualObligation

us-gaap:ContractualObligation


Contractual
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value2493494575741058964
Percentage of ContractualObligation100.0100.0100.0100.0100.0100.0

us-gaap:ContractualObligation us-gaap:OtherCommitments

sm:DrillingRigLeasingContracts


Contractual
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312019-09-302019-06-302018-12-312018-03-312017-12-312016-12-312016-09-302015-12-31
Value16235.9123457778615837312035
Percentage of ContractualObligation0.00.02.40.09.80.00.019.00.06.62.90.03.7

sm:ElectricityPurchaseAgreement


Contractual
Period End2020-12-312019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302018-03-31
Value4553555729293031
Percentage of ContractualObligation18.215.20.00.06.30.00.00.0

sm:OfficeSpaceLeases


Contractual
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312016-09-302015-12-31
Value22283543506.559
Percentage of ContractualObligation8.98.17.87.54.70.06.2

sm:OperatingLease


Contractual
Period End2021-06-30
Value26
Percentage of ContractualObligation0.0

sm:OtherMiscellaneousContractsAndLeases


Contractual
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value141518306.05.7
Percentage of ContractualObligation5.74.44.05.30.60.6

sm:PipelineCommitments


Contractual
Period End2020-12-312019-12-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-31
Value161218287342360461463445456458
Percentage of ContractualObligation64.862.562.90.00.00.080.60.00.00.0

us-gaap:ContractualObligation us-gaap:OtherCommitments, us-gaap:SubsequentEventType

sm:DrillingRigLeasingContracts, us-gaap:SubsequentEvent


Contractual
Period End2021-02-172018-11-022018-08-022017-11-032017-07-262017-05-03
Value1993103302330
Percentage of ContractualObligation0.00.00.00.00.00.0

us-gaap:ContractualObligationDueAfterFifthYear

us-gaap:ContractualObligationDueAfterFifthYear


Contractual
Period End2020-12-31
Value13
Percentage of ContractualObligationDueAfterFifthYear100.0

us-gaap:ContractualObligationDueInFifthYear

us-gaap:ContractualObligationDueInFifthYear


Contractual
Period End2020-12-31
Value11
Percentage of ContractualObligationDueInFifthYear100.0

us-gaap:ContractualObligationDueInFourthYear

us-gaap:ContractualObligationDueInFourthYear


Contractual
Period End2020-12-31
Value12
Percentage of ContractualObligationDueInFourthYear100.0

us-gaap:ContractualObligationDueInNextTwelveMonths

us-gaap:ContractualObligationDueInNextTwelveMonths


Contractual
Period End2020-12-31
Value86
Percentage of ContractualObligationDueInNextTwelveMonths100.0

us-gaap:ContractualObligationDueInSecondYear

us-gaap:ContractualObligationDueInSecondYear


Contractual
Period End2020-12-31
Value79
Percentage of ContractualObligationDueInSecondYear100.0

us-gaap:ContractualObligationDueInThirdYear

us-gaap:ContractualObligationDueInThirdYear


Contractual
Period End2020-12-31
Value45
Percentage of ContractualObligationDueInThirdYear100.0

us-gaap:DebtInstrumentFaceAmount us-gaap:DebtInstrument

us-gaap:DebtInstrumentFaceAmount

sm:A100SeniorSecuredNotesDue2025


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-06-172019-12-31
Value4464464464464464460.0
Percentage of DebtInstrumentFaceAmount100.0100.0100.0100.0100.0100.00.0

sm:A150SeniorSecuredConvertibleNotesDue2021


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value65656565650.0
Percentage of DebtInstrumentFaceAmount14.714.714.714.714.70.0

sm:A50SeniorUnsecuredNotesDue2024


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312013-05-20
Value104277277315344500500
Percentage of DebtInstrumentFaceAmount23.562.062.070.777.20.00.0

sm:A5625SeniorUnsecuredNotesDue2025


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312015-05-21
Value349349349349349500500
Percentage of DebtInstrumentFaceAmount78.278.278.278.278.20.00.0

sm:A6125SeniorUnsecuredNotesDue2022


Debt
Period End2021-03-312020-12-312020-09-302020-06-302019-12-312014-11-17
Value212212231294476600
Percentage of DebtInstrumentFaceAmount47.647.651.965.90.00.0

sm:A6625SeniorUnsecuredNotesDue2027


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312018-08-20
Value416416416416416500500
Percentage of DebtInstrumentFaceAmount93.393.393.393.393.30.00.0

sm:A675SeniorUnsecuredNotesDue2026


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-312016-09-12
Value419419419419419500500
Percentage of DebtInstrumentFaceAmount93.993.993.993.993.90.00.0

sm:SeniorUnsecuredNotes


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value168916741674173218242649
Percentage of DebtInstrumentFaceAmount378.3374.9374.9387.9408.40.0

us-gaap:DebtInstrumentRepurchaseAmount us-gaap:DebtInstrument

us-gaap:DebtInstrumentRepurchaseAmount

sm:A50SeniorUnsecuredNotesDue2024


Debt
Period End2020-12-31
Value42
Percentage of DebtInstrumentRepurchaseAmount100.0

sm:A6125SeniorUnsecuredNotesDue2022


Debt
Period End2020-12-312020-03-312018-12-312016-12-31
Value94288824
Percentage of DebtInstrumentRepurchaseAmount222.70.00.00.0

sm:A6125SeniorUnsecuredNotesDue2022And50SeniorUnsecuredNotesDue2024


Debt
Period End2021-06-302020-12-312020-09-30
Value38513665
Percentage of DebtInstrumentRepurchaseAmount0.0322.70.0

us-gaap:DebtInstrumentRepurchasedFaceAmount us-gaap:DebtInstrument

us-gaap:DebtInstrumentRepurchasedFaceAmount

sm:A50SeniorUnsecuredNotesDue2024


Debt
Period End2021-06-232020-12-312020-09-302020-06-17
Value1726729155
Percentage of DebtInstrumentRepurchasedFaceAmount100.0100.0100.0100.0

sm:A6125SeniorUnsecuredNotesDue2022


Debt
Period End2021-06-302021-06-232020-12-312020-09-302020-06-172020-03-312018-12-312016-12-31
Value1919312262141408538
Percentage of DebtInstrumentRepurchasedFaceAmount0.0112.1181.5215.591.20.00.00.0

sm:A6125SeniorUnsecuredNotesDue2022And50SeniorUnsecuredNotesDue2024


Debt
Period End2020-12-31
Value190
Percentage of DebtInstrumentRepurchasedFaceAmount281.5

us-gaap:DebtInstrumentUnamortizedDiscount us-gaap:DebtInstrument

us-gaap:DebtInstrumentUnamortizedDiscount

sm:A100SeniorSecuredNotesDue2025


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value3436373941
Percentage of DebtInstrumentUnamortizedDiscount100.0100.0100.0100.0100.0

sm:A150SeniorSecuredConvertibleNotesDue2021


Debt
Period End2021-03-312020-12-312020-09-302020-06-30
Value0.9141.8282.713.592
Percentage of DebtInstrumentUnamortizedDiscount2.54.86.88.7

sm:SeniorSecuredNotes


Debt
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value3436394244
Percentage of DebtInstrumentUnamortizedDiscount100.0102.5104.8106.8108.7

us-gaap:DeferredFinanceCostsGross us-gaap:DebtInstrument

us-gaap:DeferredFinanceCostsGross

sm:A100SeniorSecuredNotesDue2025


Deferred
Period End2020-12-312020-09-30
Value1312
Percentage of DeferredFinanceCostsGross100.0100.0

sm:A65SeniorUnsecuredNotesDue2028


Deferred
Period End2021-06-23
Value7.2
Percentage of DeferredFinanceCostsGross0.0

us-gaap:DeferredIncomeTaxLiabilities

us-gaap:DeferredIncomeTaxLiabilities


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value9322225814552610341254779701656
Percentage of DeferredIncomeTaxLiabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsDerivativeInstruments

us-gaap:DeferredTaxAssetsDerivativeInstruments


Deferred
Period End2020-12-312018-12-312017-12-312016-12-312015-12-312011-12-312010-12-31
Value360.029310.00.06.929
Percentage of DeferredTaxAssetsDerivativeInstruments100.00.0100.0100.00.00.0100.0

us-gaap:DeferredTaxAssetsGross

us-gaap:DeferredTaxAssetsGross


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value10735376821528622614417796101
Percentage of DeferredTaxAssetsGross100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards

us-gaap:DeferredTaxAssetsOperatingLossCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value3.8984.1724.2173.867151244184
Percentage of DeferredTaxAssetsOperatingLossCarryforwards100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsOther

us-gaap:DeferredTaxAssetsOther


Deferred
Period End2020-12-312019-12-31
Value7.27310
Percentage of DeferredTaxAssetsOther100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value7.543112222126.952
Percentage of DeferredTaxAssetsTaxCreditCarryforwards100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxCreditCarryforwards us-gaap:IncomeTaxAuthority, us-gaap:IncomeTaxAuthorityName, us-gaap:TaxCreditCarryforward

us-gaap:DomesticCountry, us-gaap:InternalRevenueServiceIRS, us-gaap:Research


Deferred
Period End2020-12-31
Value7.5
Percentage of DeferredTaxAssetsTaxCreditCarryforwards99.4

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions


Deferred
Period End2020-12-312019-12-31
Value7183000.05971000.0
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost

us-gaap:DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value2.7013.5033.2633.54510141618181713
Percentage of DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations

us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations


Deferred
Period End2020-12-312019-12-31
Value1819
Percentage of DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAssetRetirementObligations100.0100.0

us-gaap:DeferredTaxLiabilitiesOther

us-gaap:DeferredTaxLiabilitiesOther


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value10124.8123.4127.7331.2334.4751.2456.4431.8732.723
Percentage of DeferredTaxLiabilitiesOther100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment

us-gaap:DeferredTaxLiabilitiesPropertyPlantAndEquipment


Deferred
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value832052181425188541029768678639
Percentage of DeferredTaxLiabilitiesPropertyPlantAndEquipment100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value171415212221178.575128.671-5.892
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value-17.328-14.406-15.741-21.397-22.708-20.966178.439128.501-5.892
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax

us-gaap:DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value14000.031000.048000.066000.083000.0101000.0118000.0
Percentage of DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value2.90.0360.0440.0380.0420.0470.0430.050.0390.0470.0530.061
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease

us-gaap:DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value4.40.0450.0620.0620.0620.0620.0620.0620.0620.0620.0620.062
Percentage of DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter


Defined
Period End2020-12-31
Value24
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths


Defined
Period End2020-12-31
Value9564000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive


Defined
Period End2020-12-31
Value5996000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour


Defined
Period End2020-12-31
Value4765000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree


Defined
Period End2020-12-31
Value5390000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree100.0

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo

us-gaap:DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo


Defined
Period End2020-12-31
Value3769000.0
Percentage of DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo100.0

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear

us-gaap:DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear


Defined
Period End2020-12-31
Value7000000.0
Percentage of DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear100.0

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanFairValueOfPlanAssets


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-31
Value32353030312527242013109.101
Percentage of DefinedBenefitPlanFairValueOfPlanAssets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanFundedStatusOfPlan

us-gaap:DefinedBenefitPlanFundedStatusOfPlan


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-31
Value-40699000.0-35209000.0-35986000.0-40959000.0-37928000.0-36778000.0-29927000.0-18627000.0-19983000.0-15540000.0-13535000.0
Percentage of DefinedBenefitPlanFundedStatusOfPlan100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value6360525654
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value3235303031
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation

us-gaap:DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-31
Value7370667169
Percentage of DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateProjectedBenefitObligation100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value100.01.01.01.0
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanPlanAssetsTargetAllocationPercentage us-gaap:DefinedBenefitPlanByPlanAssetCategories

sm:OtherSecurities


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value27.00.250.220.22
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage27.025.022.022.0

us-gaap:DefinedBenefitPlanEquitySecurities


Defined
Period End2020-12-31
Value36.0
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage36.0

us-gaap:FixedIncomeSecurities


Defined
Period End2020-12-312019-12-312018-12-312017-12-31
Value37.00.40.430.43
Percentage of DefinedBenefitPlanPlanAssetsTargetAllocationPercentage37.040.043.043.0

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-31
Value100.01.01.01.01.01.01.01.01.01.0
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DefinedBenefitPlanWeightedAverageAssetAllocations us-gaap:DefinedBenefitPlanByPlanAssetCategories

sm:OtherSecurities


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value38.10.250.2690.2180.3570.2690.265
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations38.125.026.921.835.726.926.5

us-gaap:CorporateDebtSecurities


Defined
Period End2020-12-312019-12-31
Value8.36.7
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations8.3670.0

us-gaap:DefinedBenefitPlanCommonCollectiveTrust


Defined
Period End2020-12-312019-12-31
Value4.63.3
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations4.6330.0

us-gaap:DefinedBenefitPlanEquitySecurities


Defined
Period End2020-12-312019-12-31
Value37.036.9
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations37.03690.0

us-gaap:DefinedBenefitPlanEquitySecuritiesNonUs


Defined
Period End2020-12-312019-12-31
Value18.319.6
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations18.31960.0

us-gaap:DefinedBenefitPlanEquitySecuritiesUs


Defined
Period End2020-12-312019-12-31
Value18.717.3
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations18.71730.0

us-gaap:DefinedBenefitPlanRealEstate


Defined
Period End2020-12-312019-12-31
Value5.75.4
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations5.7540.0

us-gaap:FixedIncomeInvestments


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value16.60.3140.3440.2860.250.2250.224
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations16.631.434.428.625.022.522.4

us-gaap:FixedIncomeSecurities


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value24.90.3810.4130.3980.3550.340.339
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations24.938.141.339.835.534.033.9

us-gaap:HedgeFunds


Defined
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value27.80.1630.1780.1120.1130.1380.148
Percentage of DefinedBenefitPlanWeightedAverageAssetAllocations27.816.317.811.211.313.814.8

us-gaap:DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection

us-gaap:DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value0.4670.1880.755551834934013784411770.030114.59338103694.0168099355488592
Percentage of DerivativeAssetFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetNotOffsetPolicyElectionDeduction

us-gaap:DerivativeAssetNotOffsetPolicyElectionDeduction


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value4434531046215354360525690147100100856488118136158860.0080.07
Percentage of DerivativeAssetNotOffsetPolicyElectionDeduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetsCurrent

us-gaap:DerivativeAssetsCurrent


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value312031128211463551431146717581146776463857354109145281367347269380402413.6137.45214358233755
Percentage of DerivativeAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetsCurrent us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value312031128211463551431146717581146776463857354109145281367347269380402413.6137.45214358233755
Percentage of DerivativeAssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetsNoncurrent

us-gaap:DerivativeAssetsNoncurrent


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value13132331344420383027588.85331354060828467107113160120147131204189221.3133028288.5711622443031391012188.251
Percentage of DerivativeAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetsNoncurrent us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value13132331344420383027588.85331354060828467107113160120147131204189221.3133028288.5711631
Percentage of DerivativeAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeCapPrice sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeCapPrice

sm:OPISPropaneMontBelvieuNonTET, sm:NGLCollarContractYear2


Derivative
Period End2021-06-302021-03-31
Value29.1927.3
Percentage of DerivativeCapPrice100.0100.0

us-gaap:DerivativeCapPrice sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

sm:OPISPropaneMontBelvieuNonTET, sm:NGLCollarContractYear2, us-gaap:SubsequentEvent


Derivative
Period End2021-02-17
Value27.3
Percentage of DerivativeCapPrice0.0

us-gaap:DerivativeCapPrice us-gaap:DerivativeInstrumentRisk

sm:NYMEXOilCollarContractFirstQuarterYear1


Derivative
Period End2020-12-312019-12-31
Value51.9663.91
Percentage of DerivativeCapPrice0.00.0

sm:NYMEXOilCollarContractYear2


Derivative
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value58.3754.8951.9656.756.756.762.9563.6863.0
Percentage of DerivativeCapPrice200.0201.10.00.00.00.00.00.00.0

us-gaap:DerivativeCapPrice us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

sm:NYMEXOilCollarContractYear2, us-gaap:SubsequentEvent


Derivative
Period End2021-04-292021-02-172019-05-02
Value65.053.2865.07
Percentage of DerivativeCapPrice0.00.00.0

us-gaap:DerivativeFairValueOfDerivativeAsset

us-gaap:DerivativeFairValueOfDerivativeAsset


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value4434541592455087518114494233901771121041231681581222162584424884944005855926352
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeAsset us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value443454159245508751811449423390177112104123168158122216258442488494400585592634.9132152718631546411398869439
Percentage of DerivativeFairValueOfDerivativeAsset100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeFairValueOfDerivativeLiability

us-gaap:DerivativeFairValueOfDerivativeLiability


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302013-12-31
Value661439222110621554438210875376326234243155106135213155168860.0084.9199.133-0.398-0.07-12.892-31.02
Percentage of DerivativeFairValueOfDerivativeLiability100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFairValueOfDerivativeLiability us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementFrequency, us-gaap:HedgingDesignation

us-gaap:FairValueInputsLevel2, us-gaap:FairValueMeasurementsRecurring, us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-30
Value-661.335-439.397-222.52-110.037-62.278-15.479-54.29438210875376326234243155106135213155168860.0084.9199.1330.3980.07121446831296.27335152810765524108
Percentage of DerivativeFairValueOfDerivativeLiability-100.0-100.0-100.0-100.0-100.0-100.0-100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0-100.0-100.0-100.00.00.0-100.00.00.00.00.00.00.00.00.00.00.0

us-gaap:DerivativeFairValueOfDerivativeNet

us-gaap:DerivativeFairValueOfDerivativeNet


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312013-12-31
Value-616.5-405.0-168.2491834932113761-13.8158-286.7-149.4-122.4-139.4-31.76123-91.708619035548859221
Percentage of DerivativeFairValueOfDerivativeNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeFloorPrice sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk

us-gaap:DerivativeFloorPrice

sm:OPISPropaneMontBelvieuNonTET, sm:NGLCollarContractYear2


Derivative
Period End2021-06-302021-03-31
Value23.8322.05
Percentage of DerivativeFloorPrice100.0100.0

us-gaap:DerivativeFloorPrice sm:DerivativeUnderlyingIndex, us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

sm:OPISPropaneMontBelvieuNonTET, sm:NGLCollarContractYear2, us-gaap:SubsequentEvent


Derivative
Period End2021-02-17
Value22.05
Percentage of DerivativeFloorPrice0.0

us-gaap:DerivativeFloorPrice us-gaap:DerivativeInstrumentRisk

sm:NYMEXOilCollarContractFirstQuarterYear1


Derivative
Period End2020-12-312019-12-31
Value48.9755.0
Percentage of DerivativeFloorPrice0.00.0

sm:NYMEXOilCollarContractYear2


Derivative
Period End2021-06-302021-03-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-31
Value51.8450.048.9755.055.055.055.055.055.0
Percentage of DerivativeFloorPrice217.5226.80.00.00.00.00.00.00.0

us-gaap:DerivativeFloorPrice us-gaap:DerivativeInstrumentRisk, us-gaap:SubsequentEventType

sm:NYMEXOilCollarContractYear2, us-gaap:SubsequentEvent


Derivative
Period End2021-04-292021-02-172019-05-02
Value50.050.055.0
Percentage of DerivativeFloorPrice0.00.00.0

us-gaap:DerivativeLiabilitiesCurrent

us-gaap:DerivativeLiabilitiesCurrent


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value54537120076388.277503770956230425918117287365311551638.2110.0082.98.1070.04.649926026224.748228.99942
Percentage of DerivativeLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilitiesCurrent us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value54537120076388.277503770956230425918117287365311551638.2110.0082.98.1070.00.04.649926026224.748228.99942
Percentage of DerivativeLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilitiesNoncurrent

us-gaap:DerivativeLiabilitiesNoncurrent


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value116672233247.2023.4446.0141213127267537167698198104104780.02.0191.0260.3980.078.243527.8854.646.8731.525126.6458.8020.95625123.18438643265
Percentage of DerivativeLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilitiesNoncurrent us-gaap:HedgingDesignation

us-gaap:Nondesignated


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312011-12-31
Value116672233247.2023.4446.0141213127267537167698198104104780.02.0191.0260.3980.078.243527.8854.646.8731.525126.64512
Percentage of DerivativeLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection

us-gaap:DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value6164051686.00.00.0190.02255192861791341437041469519-9.1970.00.00.0
Percentage of DerivativeLiabilityFairValueOffsetAgainstCollateralNetOfNotSubjectToMasterNettingArrangementPolicyElection100.0100.0100.0100.00.00.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.0

us-gaap:DerivativeLiabilityNotOffsetPolicyElectionDeduction

us-gaap:DerivativeLiabilityNotOffsetPolicyElectionDeduction


Derivative
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value4434531046215354360525690147100100856488118136158860.0080.07
Percentage of DerivativeLiabilityNotOffsetPolicyElectionDeduction100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeRelatedLiabilitiesCurrent

us-gaap:EmployeeRelatedLiabilitiesCurrent


Employee
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value30413139344156
Percentage of EmployeeRelatedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized us-gaap:AwardType

us-gaap:EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized

us-gaap:PerformanceShares


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value3.04.54.48.110.01215191315192212151822101415181215182113181924111418229.81419
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


Employee
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-31
Value1012148.61013162113162024121619229.81214171215192214192226121519227.71114
Percentage of EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized336.7277.8334.1106.2108.0105.4106.3108.6105.4103.1105.3105.2103.2103.8102.7103.692.590.890.694.297.6101.3104.9106.6110.0106.6113.6108.1113.3106.7102.7100.078.674.873.5

us-gaap:InterestPayableCurrent

us-gaap:InterestPayableCurrent


Interest
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-31
Value52444045453440
Percentage of InterestPayableCurrent100.0100.0100.0100.0100.0100.0100.0

us-gaap:LesseeOperatingLeaseDiscountRate

us-gaap:LesseeOperatingLeaseDiscountRate


Lessee
Period End2020-12-312020-09-302019-12-31
Value7.06.96.6
Percentage of LesseeOperatingLeaseDiscountRate100.0100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths

us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths


Lessee
Period End2020-12-312020-09-30
Value1212
Percentage of LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths100.0100.0

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear

us-gaap:LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear


Lessee
Period End2020-09-30
Value3546000.0
Percentage of LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear100.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:CreditFacility

us-gaap:LettersOfCreditOutstandingAmount

us-gaap:RevolvingCreditFacility


Letters
Period End2020-12-31
Value42
Percentage of LettersOfCreditOutstandingAmount100.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:CreditFacility, us-gaap:LongtermDebtType

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Letters
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value42420.00.00.00.00.00.20.20.20.20.20.20.20.20.20.20.20.20.2
Percentage of LettersOfCreditOutstandingAmount0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:CreditFacility, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:SubsequentEvent


Letters
Period End2020-10-212020-07-232020-04-292020-02-062019-10-242019-07-232019-04-252019-02-072018-10-242018-07-252018-04-252018-02-142017-10-262017-07-262017-04-262017-02-152016-10-262016-07-272016-04-27
Value42420.00.00.00.00.00.00.20.20.20.20.20.20.20.20.20.20.2
Percentage of LettersOfCreditOutstandingAmount0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:LongtermDebtType

us-gaap:LineOfCredit


Letters
Period End2020-12-312015-12-312014-12-31
Value420.20.808
Percentage of LettersOfCreditOutstandingAmount100.00.00.0

us-gaap:LettersOfCreditOutstandingAmount us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:LineOfCredit, us-gaap:SubsequentEvent


Letters
Period End2021-02-042016-02-17
Value420.2
Percentage of LettersOfCreditOutstandingAmount0.00.0

us-gaap:LineOfCredit us-gaap:LongtermDebtType

us-gaap:LineOfCredit

us-gaap:LineOfCredit


Line
Period End2020-12-312019-12-312015-12-312014-12-31
Value93122202166
Percentage of LineOfCredit100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity us-gaap:CreditFacility, us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Line
Period End2020-09-302019-04-182019-03-312018-06-302018-04-242018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-08-122016-06-302016-04-082016-03-312015-12-31
Value110016001500130014009259259259259251165110611001250125015001500
Percentage of LineOfCreditFacilityCurrentBorrowingCapacity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LineOfCreditFacilityCurrentBorrowingCapacity us-gaap:LongtermDebtType

us-gaap:LineOfCredit


Line
Period End2020-12-31
Value1100
Percentage of LineOfCreditFacilityCurrentBorrowingCapacity0.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:CreditFacility, us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Line
Period End2020-09-30
Value2500
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity us-gaap:LongtermDebtType

us-gaap:LineOfCredit


Line
Period End2020-12-31
Value2500
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity0.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:CreditFacility

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:RevolvingCreditFacility


Line
Period End2021-06-302021-03-312020-12-31
Value1047965965
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0100.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:CreditFacility, us-gaap:LongtermDebtType

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Line
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-31
Value88086511281077107110829539999999999249249249249241164110691912061297
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:CreditFacility, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:SubsequentEvent


Line
Period End2020-10-212020-07-232020-04-292020-02-062019-10-242019-07-232019-04-252019-02-072018-10-242018-07-252018-04-252018-02-142017-10-262017-07-262017-04-262017-02-152016-10-262016-07-272016-04-27
Value92987810061086105710741160100099999999992492492492410611249919955
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:CreditFacility, us-gaap:SubsequentEventType

us-gaap:RevolvingCreditFacility, us-gaap:SubsequentEvent


Line
Period End2021-07-212021-04-21
Value10011023
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity0.00.0

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity us-gaap:LongtermDebtType

us-gaap:LineOfCredit


Line
Period End2020-12-312019-12-312015-12-312014-12-31
Value965107712971333
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.00.00.00.0

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us-gaap:LineOfCredit, us-gaap:SubsequentEvent


Line
Period End2021-02-042016-02-17
Value9361256
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity0.00.0

us-gaap:LongTermDebtFairValue us-gaap:DebtInstrument

us-gaap:LongTermDebtFairValue

sm:A100SeniorSecuredNotesDue2025


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value5055024824264240.0
Percentage of LongTermDebtFairValue100.0100.0100.0100.0100.00.0

sm:A150SeniorSecuredConvertibleNotesDue2021


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value64636161600.0
Percentage of LongTermDebtFairValue12.812.712.714.314.20.0

sm:A50SeniorUnsecuredNotesDue2024


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value104261240173190479
Percentage of LongTermDebtFairValue20.752.149.740.744.90.0

sm:A5625SeniorUnsecuredNotesDue2025


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value349323289162185475
Percentage of LongTermDebtFairValue69.164.259.938.043.60.0

sm:A6125SeniorUnsecuredNotesDue2022


Long
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value209205182214481
Percentage of LongTermDebtFairValue41.742.542.650.70.0

sm:A65SeniorUnsecuredNotesDue2028


Long
Period End2021-06-30
Value412
Percentage of LongTermDebtFairValue81.5

sm:A6625SeniorUnsecuredNotesDue2027


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value429384331185206493
Percentage of LongTermDebtFairValue84.976.468.643.648.70.0

sm:A675SeniorUnsecuredNotesDue2026


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value427387342192213494
Percentage of LongTermDebtFairValue84.577.070.945.150.30.0

us-gaap:LongTermLineOfCredit

us-gaap:LongTermLineOfCredit


Long
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312012-09-302012-06-302012-03-312011-12-312011-09-302010-12-312009-12-31
Value521359317819372122129118460.00.00.00.00.00.00.00.00.00.033029320216622861240.00.048188
Percentage of LongTermLineOfCredit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0100.0

us-gaap:LongTermLineOfCredit us-gaap:CreditFacility

us-gaap:RevolvingCreditFacility


Long
Period End2021-06-302021-03-312020-12-31
Value5213593
Percentage of LongTermLineOfCredit100.0100.0100.0

us-gaap:LongTermLineOfCredit us-gaap:CreditFacility, us-gaap:LongtermDebtType

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Long
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302015-12-31
Value17819372122129118460.00.00.00.00.00.00.00.00.00.0330202
Percentage of LongTermLineOfCredit100.0100.0100.0100.0100.0100.0100.00.00.00.00.00.00.00.00.00.00.0100.0100.0

us-gaap:LongTermLineOfCredit us-gaap:CreditFacility, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit, us-gaap:SubsequentEvent


Long
Period End2020-10-212020-07-232020-04-292020-02-062019-10-242019-07-232019-04-252019-02-072018-10-242018-07-252018-04-252018-02-142017-10-262017-07-262017-04-262016-10-26
Value12918093113143126400.00.00.00.00.00.00.00.00.0
Percentage of LongTermLineOfCredit0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:LongTermLineOfCredit us-gaap:CreditFacility, us-gaap:SubsequentEventType

us-gaap:RevolvingCreditFacility, us-gaap:SubsequentEvent


Long
Period End2021-07-212021-04-21
Value9976
Percentage of LongTermLineOfCredit0.00.0

us-gaap:LongTermLineOfCredit us-gaap:LongtermDebtType

us-gaap:LineOfCredit


Long
Period End2020-12-312019-12-31
Value93122
Percentage of LongTermLineOfCredit100.0100.0

us-gaap:LongTermLineOfCredit us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

us-gaap:LineOfCredit, us-gaap:SubsequentEvent


Long
Period End2021-02-04
Value121
Percentage of LongTermLineOfCredit0.0

us-gaap:OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization

us-gaap:OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization


Oil
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value52445051488647134536438941773953377435863417324030412893317132433117258928362668360633853481324030732865323330452883272225832418273725642376219020341888176616351532142713261053
Percentage of OilAndGasPropertySuccessfulEffortMethodAccumulatedDepreciationDepletionAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:OperatingLossCarryforwards us-gaap:IncomeTaxAuthority

us-gaap:OperatingLossCarryforwards

us-gaap:StateAndLocalJurisdiction


Operating
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-31
Value4.9777971184338
Percentage of OperatingLossCarryforwards100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentOtherAccumulatedDepreciation

us-gaap:PropertyPlantAndEquipmentOtherAccumulatedDepreciation


Property
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-31
Value7564636665646464625957565352495044424138343237
Percentage of PropertyPlantAndEquipmentOtherAccumulatedDepreciation100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentOtherNet

us-gaap:PropertyPlantAndEquipmentOtherNet


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
Value413132373736727981868810210211210610610811013713714614415335935434433427625824321820317615615313512010671476121
Percentage of PropertyPlantAndEquipmentOtherNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ProvedOilAndGasPropertySuccessfulEffortMethod

us-gaap:ProvedOilAndGasPropertySuccessfulEffortMethod


Proved
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value91078735860883078134804389348143797475787278668663725824613959385631480357005406724969947606746873567006734867896151587556375414592256705401519748694657437840703799355333892797
Percentage of ProvedOilAndGasPropertySuccessfulEffortMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SeniorLongTermNotes

us-gaap:SeniorLongTermNotes


Senior
Period End2021-06-302021-03-312020-12-312020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312014-12-312011-09-302010-12-31
Value21392125212124132453245124502449244824472429277027692768276727652766276522722271231521663500.0
Percentage of SeniorLongTermNotes100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:SeniorLongTermNotes us-gaap:DebtInstrument

sm:A100SeniorSecuredNotesDue2025


Senior
Period End2020-12-312020-06-30
Value397393
Percentage of SeniorLongTermNotes18.70.0

sm:A150SeniorSecuredConvertibleNotesDue2021


Senior
Period End2020-12-312020-06-30
Value6361
Percentage of SeniorLongTermNotes3.00.0

sm:A50SeniorUnsecuredNotesDue2024


Senior
Period End2020-12-312020-06-302019-12-31
Value275342496
Percentage of SeniorLongTermNotes13.00.020.2

sm:A5625SeniorUnsecuredNotesDue2025


Senior
Period End2020-12-312020-06-302019-12-31
Value346346495
Percentage of SeniorLongTermNotes16.30.020.2

sm:A6125SeniorUnsecuredNotesDue2022


Senior
Period End2020-12-312020-06-302019-12-31
Value211292473
Percentage of SeniorLongTermNotes10.00.019.3

sm:A6625SeniorUnsecuredNotesDue2027


Senior
Period End2020-12-312020-06-302019-12-31
Value412411493
Percentage of SeniorLongTermNotes19.40.020.1

sm:A675SeniorUnsecuredNotesDue2026


Senior
Period End2020-12-312020-06-302019-12-31
Value415414494
Percentage of SeniorLongTermNotes19.60.020.2

sm:SeniorSecuredNotes


Senior
Period End2020-12-312020-06-30
Value460455
Percentage of SeniorLongTermNotes21.70.0

sm:SeniorUnsecuredNotes


Senior
Period End2020-12-312020-06-302019-12-31
Value166018072610
Percentage of SeniorLongTermNotes78.30.0106.4

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber

us-gaap:PerformanceShares


Share
Period End2020-09-302019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302013-12-312013-09-302012-12-312011-12-312010-12-312009-12-31
Value1184900.02022600.02117400.01711300.01776200.01533500.01543700.0828920.0845460.0626330.0631270.0433660.0529600.0572470.0578460.0669310.0885890.01110700.01069100.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-09-302019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302013-12-312013-09-302012-12-312011-12-312010-12-312009-12-31
Value709990.01532100.01644400.01243200.01308100.01244300.01271100.0604120.0641180.0543740.0563400.0515720.0530700.0580430.0590190.0496240.0308880.0333360.0407120.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber59.975.877.772.673.681.182.372.975.886.889.2118.9100.2101.4102.074.134.930.038.1

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue us-gaap:AwardType

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue

us-gaap:PerformanceShares


Share
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302013-12-312012-12-312012-09-302011-12-312010-12-312009-12-31
Value17.5217.5616.8716.8620.6820.6622.9722.9743.2543.2961.8161.8373.6373.3166.0763.9166.1357.5239.4832.52
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedStockUnitsRSU


Share
Period End2020-12-312020-09-302019-12-312019-09-302018-12-312018-09-302017-12-312017-09-302016-12-312016-09-302015-12-312015-09-302014-12-312014-09-302013-12-312013-09-302012-12-312011-12-312010-12-312009-12-31
Value8.8315.2916.0116.0421.521.4620.2520.1437.3937.4255.0155.0468.2968.3457.0557.0251.8144.3331.1634.67
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue50.487.194.995.1104.0103.988.287.786.586.489.089.092.793.286.30.081.177.178.9106.6

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant

us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant


Share
Period End2021-06-302021-03-312020-12-312020-09-302019-12-312018-12-312017-12-312016-12-312016-09-302016-06-302015-12-312014-12-312013-12-312012-12-312011-12-31
Value3800000.03800000.03800000.04400000.04400000.05900000.03300000.05500000.05500000.06200000.02800000.03600000.03800000.01400000.02700000.0
Percentage of ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:SharesIssuedPricePerShare us-gaap:Range

us-gaap:SharesIssuedPricePerShare

srt:WeightedAverage


Shares
Period End2021-06-30
Value15.45
Percentage of SharesIssuedPricePerShare100.0

us-gaap:SharesIssuedPricePerShare us-gaap:Range, us-gaap:SubsequentEventType

srt:WeightedAverage, us-gaap:SubsequentEvent


Shares
Period End2021-04-29
Value11.36
Percentage of SharesIssuedPricePerShare0.0

us-gaap:UnamortizedDebtIssuanceExpense us-gaap:CreditFacility

us-gaap:UnamortizedDebtIssuanceExpense

us-gaap:RevolvingCreditFacility


Unamortized
Period End2021-06-302021-03-312020-12-31
Value3.53.94.3
Percentage of UnamortizedDebtIssuanceExpense100.0100.0100.0

us-gaap:UnamortizedDebtIssuanceExpense us-gaap:CreditFacility, us-gaap:LongtermDebtType

us-gaap:RevolvingCreditFacility, us-gaap:LineOfCredit


Unamortized
Period End2020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312015-12-31
Value4.75.05.55.96.36.76.06.46.72.42.73.13.53.94.35.94.9
Percentage of UnamortizedDebtIssuanceExpense0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:UnamortizedDebtIssuanceExpense us-gaap:DebtInstrument

sm:A100SeniorSecuredNotesDue2025


Unamortized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value1010111211
Percentage of UnamortizedDebtIssuanceExpense289.9278.3268.80.00.0

sm:A150SeniorSecuredConvertibleNotesDue2021


Unamortized
Period End2021-03-312020-12-312020-09-302020-06-30
Value0.0870.1750.2620.349
Percentage of UnamortizedDebtIssuanceExpense2.24.10.00.0

sm:A50SeniorUnsecuredNotesDue2024


Unamortized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.4991.4481.5761.9412.2783.766
Percentage of UnamortizedDebtIssuanceExpense14.337.136.70.00.00.0

sm:A5625SeniorUnsecuredNotesDue2025


Unamortized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value2.4762.6342.7922.953.1084.903
Percentage of UnamortizedDebtIssuanceExpense70.767.564.90.00.00.0

sm:A6125SeniorUnsecuredNotesDue2022


Unamortized
Period End2021-03-312020-12-312020-09-302020-06-302019-12-31
Value0.7430.8551.0551.4942.92
Percentage of UnamortizedDebtIssuanceExpense19.119.90.00.00.0

sm:A65SeniorUnsecuredNotesDue2028


Unamortized
Period End2021-06-30
Value7.163
Percentage of UnamortizedDebtIssuanceExpense204.7

sm:A6625SeniorUnsecuredNotesDue2027


Unamortized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value4.3374.5324.7254.925.1146.601
Percentage of UnamortizedDebtIssuanceExpense123.9116.2109.90.00.00.0

sm:A675SeniorUnsecuredNotesDue2026


Unamortized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value3.623.7953.974.1454.3215.571
Percentage of UnamortizedDebtIssuanceExpense103.497.392.30.00.00.0

sm:SeniorSecuredNotes


Unamortized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-30
Value1010111211
Percentage of UnamortizedDebtIssuanceExpense289.9280.5272.90.00.0

sm:SeniorUnsecuredNotes


Unamortized
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302019-12-31
Value181313151638
Percentage of UnamortizedDebtIssuanceExpense517.0337.2323.70.00.00.0

us-gaap:UnamortizedDebtIssuanceExpense us-gaap:LongtermDebtType

us-gaap:LineOfCredit


Unamortized
Period End2020-12-312019-12-31
Value4.35.9
Percentage of UnamortizedDebtIssuanceExpense100.00.0

us-gaap:UnprovedOilAndGasPropertySuccessfulEffortMethod

us-gaap:UnprovedOilAndGasPropertySuccessfulEffortMethod


Unproved
Period End2021-06-302021-03-312020-12-312020-09-302020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302017-03-312016-12-312016-09-302016-06-302016-03-312015-12-312015-09-302015-06-302015-03-312014-12-312014-09-302014-06-302014-03-312013-12-312013-09-302013-06-302013-03-312012-12-312012-09-302012-06-302012-03-312011-12-312011-09-302011-06-302011-03-312010-12-312009-12-31
Value6567057149079239721005143414451529158118921917198620472321241824832471177222231284381419512532536388287271263234173175160122130120107899294132
Percentage of UnprovedOilAndGasPropertySuccessfulEffortMethod100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate

us-gaap:UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate


Unrecognized
Period End2020-12-312019-12-312018-12-312017-12-312016-12-312015-12-312014-12-312013-12-312012-12-312011-12-312010-12-312009-12-312008-12-31
Value446000.0446000.0446000.0446000.0446000.02782000.01582000.02358000.02278000.01961000.0807000.0884000.0994000.0
Percentage of UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Line plots across dimensions of each concept


TTM Greenblatt ROC
_
(None,)
T T M  Greenblatt  R O C_
us-gaap:AllocatedShareBasedCompensationExpense
us-gaap:AwardType
(None,)
Allocated Share Based Compensation Expenseus-gaap: Award Type
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:ProductOrService
(None,)
Revenue From Contract With Customer Including Assessed Taxus-gaap: Product Or Service
us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax
us-gaap:StatementGeographical
(None,)
Revenue From Contract With Customer Including Assessed Taxus-gaap: Statement Geographical
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:AccountsReceivableNetCurrent
us-gaap:AccountsNotesLoansAndFinancingReceivableByReceivableType
(None,)
Accounts Receivable Net Currentus-gaap: Accounts Notes Loans And Financing Receivable By Receivable Type
us-gaap:LongTermDebtNoncurrent
us-gaap:DebtInstrument
(None,)
Long Term Debt Noncurrentus-gaap: Debt Instrument
us-gaap:UnsecuredLongTermDebt
us-gaap:DebtInstrument
(None,)
Unsecured Long Term Debtus-gaap: Debt Instrument
us-gaap:SecuredLongTermDebt
us-gaap:DebtInstrument
(None,)
Secured Long Term Debtus-gaap: Debt Instrument
us-gaap:StockholdersEquity
us-gaap:StatementEquityComponents
(None,)
Stockholders Equityus-gaap: Statement Equity Components
us-gaap:DebtInstrumentInterestRateStatedPercentage
us-gaap:DebtInstrument
(None,)
Debt Instrument Interest Rate Stated Percentageus-gaap: Debt Instrument