TNK


Line plots across dimensions of each concept
Tables

Table of contents


us-gaap:StatementEquityComponents
us-gaap:SharesOutstanding
us-gaap:StatementClassOfStock
us-gaap:CommonStockSharesIssued
us-gaap:StatementClassOfStock
us-gaap:CommonStockSharesOutstanding

us-gaap:CommonStockSharesAuthorized
us-gaap:StatementClassOfStock

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic

us-gaap:EarningsPerShareBasic

us-gaap:EarningsPerShareDiluted

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

us-gaap:Revenues

us-gaap:CostOfGoodsAndServicesSold
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingCostsAndExpenses
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
us-gaap:RelatedPartyTransaction

us-gaap:GeneralAndAdministrativeExpense
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:InterestExpense

us-gaap:OtherNonoperatingIncomeExpense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest

us-gaap:IncomeTaxExpenseBenefit

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:Assets
us-gaap:StatementBusinessSegments

us-gaap:Liabilities

us-gaap:LiabilitiesAndStockholdersEquity

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:AssetsCurrent

us-gaap:CashAndCashEquivalentsAtCarryingValue
us-gaap:LongLivedAssetsHeldForSaleByAssetType

us-gaap:AccountsReceivableNetCurrent

us-gaap:InventoryNet

us-gaap:PropertyPlantAndEquipmentNet

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures

us-gaap:Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill

us-gaap:OtherAssetsNoncurrent

us-gaap:LiabilitiesCurrent

us-gaap:LongTermDebtCurrent

us-gaap:AccountsPayableCurrent

us-gaap:AccruedLiabilitiesCurrent

us-gaap:OperatingLeaseLiabilityCurrent

us-gaap:OtherLiabilitiesCurrent
us-gaap:ProductOrService
us-gaap:ContractWithCustomerLiabilityCurrent

us-gaap:LongTermDebt
us-gaap:DebtInstrument, us-gaap:SubsequentEventType
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:LongTermDebtNoncurrent

us-gaap:OtherLiabilitiesNoncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
us-gaap:StatementEquityComponents

us-gaap:CommonStocksIncludingAdditionalPaidInCapital

us-gaap:RetainedEarningsAccumulatedDeficit

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:ProfitLoss
us-gaap:StatementEquityComponents

us-gaap:UnrecognizedTaxBenefits

us-gaap:OperatingLeaseRightOfUseAsset
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

tnk:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsRealizedGainLossNet
us-gaap:DerivativeInstrumentRisk
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities, us-gaap:StatementClassOfStock
us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:DepreciationAndAmortization
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
us-gaap:DerivativeInstrumentRisk
us-gaap:IncomeStatementLocation
us-gaap:EmployeeBenefitsAndShareBasedCompensation

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax
us-gaap:PropertyPlantAndEquipmentByType
us-gaap:GainLossOnDispositionOfAssets
us-gaap:SubsequentEventType
us-gaap:GainLossOnSaleOfPropertyPlantEquipment

us-gaap:GainLossOnSalesOfAssetsAndAssetImpairmentCharges
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncomeLossFromEquityMethodInvestments
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements

us-gaap:InvestmentIncomeInterest

us-gaap:LeaseAndRentalExpense
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OtherNonoperatingIncome
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments
us-gaap:ProceedsFromDivestitureOfBusinesses
us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType

us-gaap:RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
us-gaap:RelatedPartyTransaction
us-gaap:RelatedPartyTransaction
us-gaap:RevenueFromRelatedParties
us-gaap:StatementEquityComponents
us-gaap:StockIssuedDuringPeriodSharesEmployeeBenefitPlan

us-gaap:UnrealizedGainLossOnDerivatives
us-gaap:DerivativeInstrumentRisk
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis
tnk:AccruedLiabilitiesReceivablesCurrent
us-gaap:FairValueByMeasurementBasis
us-gaap:DebtInstrument
tnk:ActualHullCoverageRatio
us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SaleLeasebackTransactionDescription
us-gaap:SaleLeasebackTransactionDescription
tnk:LeaseObligationType
tnk:DebtCovenantMinimumFreeLiquidityAndUndrawnRevolvingCreditLine
us-gaap:DebtInstrument
tnk:LeaseObligationType
tnk:DebtCovenantMinimumFreeLiquidityAndUndrawnRevolvingCreditLineAsPercentageOfDebt
us-gaap:DebtInstrument
us-gaap:DebtInstrument
tnk:DebtInstrumentCollateralNumberofVessels
us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType
us-gaap:LongtermDebtType

us-gaap:AccruedFeesAndOtherRevenueReceivable

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentExcludingCapitalLeasedAssets
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:AdvancesToAffiliate
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:AssetsHeldForSaleLongLivedFairValueDisclosure

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent

us-gaap:DebtInstrumentCarryingAmount
us-gaap:DebtInstrument, us-gaap:LongtermDebtType
us-gaap:LongtermDebtType
us-gaap:ShortTermDebtType
us-gaap:DebtInstrumentInterestRateEffectivePercentage

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet

us-gaap:DerivativeAssetsCurrent
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis
us-gaap:DerivativeAssetsNoncurrent
us-gaap:FairValueByMeasurementBasis

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue

us-gaap:DerivativeLiabilitiesCurrent
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:DerivativeLiabilitiesNoncurrent
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis
us-gaap:FairValueByMeasurementBasis

us-gaap:DueFromAffiliateCurrent

us-gaap:DueToAffiliateCurrent
us-gaap:RelatedPartyTransaction

us-gaap:FinanceLeaseLiability
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:FinanceLeaseLiabilityCurrent

us-gaap:FinanceLeaseLiabilityNoncurrent
tnk:LeaseObligationType
us-gaap:FinanceLeaseLiabilityPaymentsDue
tnk:LeaseObligationType
us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

us-gaap:FinanceLeaseRightOfUseAsset

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue
us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency
us-gaap:InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity
us-gaap:LongtermDebtType
us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:LongtermDebtWeightedAverageInterestRate

us-gaap:PrepaidExpenseCurrent

us-gaap:PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssets
us-gaap:LongLivedAssetsHeldForSaleByAssetType
us-gaap:RestrictedCashAndCashEquivalents

us-gaap:RestrictedCashCurrent

us-gaap:RestrictedCashNoncurrent

us-gaap:SaleLeasebackTransactionAccumulatedDepreciation

us-gaap:ShortTermBorrowings
us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

Tables

  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
 us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock us-gaap:CommonClassA▁▁██████▅▅▅▅▅▅29.129.0232.0232.0231.6231.6231.6231.2142.2142.2136.1133.1133.1132.8NA103.671.271.1NA
 us-gaap:CommonStockSharesIssued us-gaap:StatementClassOfStock us-gaap:CommonClassB▁▁████████▅▅▅▅4.64.637.037.037.037.037.037.037.037.023.223.223.223.2NA16.712.512.5NA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock us-gaap:CommonClassA▁▁██████▅▅▅▅▅▅29.129.0232.0232.0231.6231.6231.6231.2142.2142.2136.1133.1133.1132.8NA103.671.271.1NA
 us-gaap:CommonStockSharesOutstanding us-gaap:StatementClassOfStock us-gaap:CommonClassB▁▁████████▅▅▅▅4.64.637.037.037.037.037.037.037.037.023.223.223.223.2NA16.712.512.5NA
us-gaap:CommonStockSharesAuthorized ██████▃▃▁▁▁▁▁▁585.0585.0585.0585.0585.0585.0385.0385.0300.0300.0300.0300.0300.0300.0NA300.0300.0300.0NA
us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding 33.97873NA268.990399268.990399NA268.558556268.558556NA179.224094169.963717NA156.284136156.446895NA135.174756116.72542883.96687483.5910379.911673
us-gaap:WeightedAverageNumberOfSharesOutstandingBasic 33.727978NA268.990399268.990399NA268.558556268.558556NA179.224094169.963717NA156.284136156.208917NA134.630768116.15098583.67642583.5910379.911673
us-gaap:EarningsPerShareBasic █▄▁▁▂▁▁▁▁▁▂▁▂▂▂▂▂▁▂2.911.31-0.07-0.050.03999999999999998-0.07-0.10.0-0.12-0.220.040000000000000036-0.030.140.34000000000000010.310.380.05-0.070.01
us-gaap:EarningsPerShareDiluted █▄▁▁▂▁▁▁▁▁▂▁▂▂▂▂▂▁▂2.891.31-0.07-0.050.03999999999999998-0.07-0.10.0-0.12-0.220.040000000000000036-0.030.140.330000000000000070.30.380.05-0.070.01
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax ▆█▄▅▆▄▄▂▂▃▃▃▃▄▃▃▁▁▁246.492326.835182.304202.277239.724175.915171.659100.66691.238108.789141.351104.621139.621168.986126.401107.59444.43343.49251.04
us-gaap:Revenues ▆█▄▅▆▄▄▂▂▃▃▃▃▄▃▃▁▁▁246.492326.835182.304202.277239.724175.915171.659100.66691.238108.789117.704104.621139.621168.986126.401107.59444.43343.49251.04
us-gaap:CostOfGoodsAndServicesSold ▄█▆▆▇▅▆▁▁▁61.558124.56187.72692.668110.60283.04886.93315.8818.30319.43NANANANANANANANANA
us-gaap:OperatingCostsAndExpenses 46.218NANA53.6NANANANANANANANANANANANANANANA
us-gaap:GeneralAndAdministrativeExpense ▇▇▇▇█▇▇▇▇▇▁▇▇9.7848.9928.7399.50811.8368.7479.4078.0047.6228.365-8.9778.2149.503NANA3.0393.1633.3622.322
us-gaap:OperatingIncomeLoss ██▂▂▄▂▁▂▁▂▂▂▄▆▅▅▃▂▂92.98691.608-4.8735.05131.206-2.166-13.4152.822-13.7341.5875.66-3.79330.75156.5344.58443.66810.491-5.5346.918
us-gaap:InterestExpense ▆▇███▇▇▄▃▃▃▃▃▄▂▁▁▁▃13.49215.67916.13416.60716.98715.00613.9319.6137.2997.0767.3636.8097.3417.734.0083.0752.2742.6046.654
us-gaap:OtherNonoperatingIncomeExpense ▄▃▄▃█▂▂▄▂▁▂▃▂▂▂▃▃▃▂940000.0-487000.0933000.0614000.07122000.0-799000.0-1273000.0917000.0-1768000.0-2761000.0-1938000.0453000.0-1940000.0-1259000.0-1385000.0-474000.0-89000.0-354000.0-703000.0
us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 83.6NANA-12.668NANANANANANANANANANANANANANANA
us-gaap:IncomeTaxExpenseBenefit -14.598NANA1.639NANANANANANANANANANANANANANANA
us-gaap:ProfitLoss █▆▂▂▄▂▂▃▂▁▃▃▄▆▅▅▃▃▃98.19863.072-19.85-14.30711.502-17.484-27.413-1.879-22.38-37.4776.846-5.45722.48653.55940.9544.2424.589-5.724-4.323
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
 COGS Ratio us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,tnk:Tankers245728000.0NANA197442000.0NANANANANANANANANANANANANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,tnk:ShipToShipTransfer▁▆▅▅▇▇▆▆▇█▆▆▆▆▅764000.010220000.08685000.09565000.013114000.012019000.011210000.011035000.011902000.014597000.010214000.09837000.010999000.09737000.08850000.0NANANANA
 Operating Margin us-gaap:ConsolidationItems,us-gaap:StatementBusinessSegments us-gaap:OperatingSegments,tnk:Tankers245728000.0NANA197442000.0NANANANANANANANANANANANANANANA
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
us-gaap:Assets ▆█▇▇▇▇▇█▁▂▄▄▆▇2071.9662229.4762170.1382153.9282161.0862129.1942140.6962197.3481735.9531803.4261932.4251957.7842063.732169.476NA1314.155977.4991091.833NA
us-gaap:Liabilities ▁▇▇▇▇▆▆▆▁▂▃▄▅█876.1671239.5561243.8511208.0331214.1531193.9831188.2261190.747873.525913.4571011.8011047.111138.4131292.015NA731.333664.808802.158NA
us-gaap:LiabilitiesAndStockholdersEquity ▆█▇▇▇▇▇█▁▂▄▄▆▇2071.9662229.4762170.1382153.9282161.0862129.1942140.6962197.3481735.9531803.4261932.4251957.7842063.732169.476NA1314.155977.4991091.833NA
us-gaap:StockholdersEquity █▄▂▃▃▃▃▄▁▂▂▂▂▁1195.799989.92926.287945.895946.933935.211952.471006.601862.428889.969920.624910.674925.317877.461NA582.822312.691289.675NA
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
us-gaap:AssetsCurrent ▆█▄▃▃▂▁▂▁▂▃▂▄▄348.917421.225261.544228.478225.591177.799168.329176.685149.187178.992215.484186.814251.181279.814NA191.7683.241204.721NA
us-gaap:CashAndCashEquivalentsAtCarryingValue █▄▄▂▃▃▂▃▃▄▃▃▃▅▄▄▁▂▁167.90788.82476.70535.42954.91754.36148.45771.43960.60687.25568.10859.23758.01896.41780.57983.08221.76437.70818.554
us-gaap:AccountsReceivableNetCurrent ▇█▄▄▁▁▁▁▂▁▂▂▃▂88.66395.64852.24551.45117.36517.04815.91219.28822.48418.18730.24725.24543.61128.313NA11.3442.5457.633NA
us-gaap:InventoryNet ▂▆▆█▁30.88549.7950.47363.44123.179NANANANANANANANANANANANANANA
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
us-gaap:PropertyPlantAndEquipmentNet ▆▇██▂▄▆▆▁▄▅▆▆▇1683.7341769.7261859.7331875.8551401.5511556.9591695.7221737.7921283.9891554.0551605.3721664.8591706.2881767.925NA1035.311841.013867.035NA
us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures ▂▁▁▁▁▁▁▁▃▃▇▇▇█29.7428.11226.41826.35125.76624.81125.1725.4642.92743.20181.27378.77177.86286.808NA79.566NA7.289NA
us-gaap:Goodwill ▃▃███████████▁2.4262.4268.0598.0598.0598.0598.0598.0598.0598.0598.0598.0598.0590.0NANANANANA
us-gaap:IntangibleAssetsNetExcludingGoodwill ▁▁▃▃▃▄▄▄▄▅▅▅▅█2.2592.5459.95510.49811.62512.3213.0314.60515.26216.04417.65818.49119.34229.619NANANANANA
us-gaap:OtherAssetsNoncurrent ▆█▄▅▁▁▁▁▁▁▁▁▁▁1453000.01923000.0910000.01010000.074000.082000.092000.0127000.0139000.0155000.041000.073000.082000.0146000.0NA1992000.04564000.02958000.0NA
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
us-gaap:LiabilitiesCurrent ▁▇█▆▂▁▅▄▄▄▄▄▄█185.818279.705295.414269.501197.761179.231241.927236.714223.623224.096236.922222.093228.798289.652NA187.78786.50772.748NA
us-gaap:LongTermDebtCurrent ▁▂▅▅▅▅▇█▇▇█▇▇█27.54943.573101.295101.264106.236103.843155.089166.745159.087150.254171.019155.69151.761174.047NA144.45351.95925.246NA
us-gaap:AccountsPayableCurrent ▇█▆▅▂▁▁▁▂▁▂▁▂▂59.65270.97854.82447.53211.1465.3525.8227.8610.3539.25312.2659.85810.78416.717NA5.7473.3882.098NA
us-gaap:AccruedLiabilitiesCurrent ▄█▅▇▄▃▃▃▂▁▁▁▅█40.3659.73546.51956.44840.85635.71734.06334.60829.75626.15727.22426.25947.12162.029NA18.21814.97114.543NA
us-gaap:OperatingLeaseLiabilityCurrent ▆██▆▁10.98616.2916.40512.2240.0NANANANANANANANANANANANANANA
us-gaap:OtherLiabilitiesCurrent ██▁▁▁8485000.08567000.0255000.0316000.00.0NANANANANANANANANANANANANANA
 us-gaap:ContractWithCustomerLiabilityCurrent us-gaap:ProductOrService tnk:Timecharter█▁7700000.07500000.0NANA0.0100000.00.0500000.0NANANANANANANANANANANA
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
us-gaap:LongTermDebt ▁▃▃▃▄▅▆▆▄▅▆▆▇█312.938559.679608.96593.226735.406807.078933.817952.302645.905821.786933.016966.6511044.271164.605NA674.672609.398730.214NA
us-gaap:LongTermDebtNoncurrent ▁▃▃▃▄▅▆▆▃▅▆▆▇█285.389516.106507.665491.962629.17703.235778.728785.557486.818671.532761.997810.961892.509990.558NA530.219557.439704.968NA
us-gaap:OtherLiabilitiesNoncurrent ▄█▅▅▅▄▄▃▂▂▁27.51651.04437.47437.16632.82930.64629.6226.79519.22617.82913.683NANANANANA5.4444.902NA
us-gaap:OperatingLeaseLiabilityNoncurrent ▁▄██▁417000.03270000.07190000.06865000.00.0NANANANANANANANANANANANANANA
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
us-gaap:StockholdersEquity █▄▂▃▃▃▃▄▁▂▂▂▂▁1195.799989.92926.287945.895946.933935.211952.471006.601862.428889.969920.624910.674925.317877.461NA582.822312.691289.675NA
us-gaap:CommonStocksIncludingAdditionalPaidInCapital ████████▃▃▁▁▁▁1298.3971297.5551296.9931296.7511295.9291295.7091295.4851294.9981143.5691143.3531103.3041095.5111095.3221094.874NA853.671673.966672.744NA
us-gaap:RetainedEarningsAccumulatedDeficit █▃▁▂▂▁▂▃▃▄▆▆▆▅-102598000.0-307635000.0-370706000.0-350856000.0-348996000.0-360498000.0-343015000.0-288397000.0-281141000.0-253384000.0-182680000.0-184837000.0-170005000.0-217413000.0NA-270849000.0-361275000.0-383069000.0NA
us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue 374000.0NA242000.0154000.0235000.0224000.0148000.0167000.0216000.0NA235000.0189000.0NANANANANANANA
 us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue us-gaap:StatementClassOfStock,us-gaap:StatementEquityComponents us-gaap:CommonClassA,us-gaap:CommonStockIncludingAdditionalPaidInCapital374000.0NA242000.0154000.0235000.0224000.0148000.0167000.0216000.0NA235000.0189000.0NANANANANANANA
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
us-gaap:ProfitLoss █▆▂▂▄▂▂▃▂▁▃▃▄▆▅▅▃▃▃98.19863.072-19.85-14.30711.502-17.484-27.413-1.879-22.38-37.4776.846-5.45722.48653.55940.9544.2424.589-5.724-4.323
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
  2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30

us-gaap:StatementEquityComponents

us-gaap:SharesOutstanding

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Period End2020-06-302020-03-312019-12-312018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312012-12-312011-12-31
Value-33738000.033712000.033655000.0268559000.0268559000.0268559000.0268202000.0179224000.0179224000.0159304000.0156284000.0156284.0156031.0120340.0112064000.083676000.083591000.083591000.061877000.0
Percentage of SharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Shares Outstanding

us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesIssued

us-gaap:CommonClassA


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value29100000.029000000.0232000000.0232000000.0231600000.0231600000.0231600000.0231200000.0142200000.0142200000.0136100000.0133100000.0133100000.0132800000.0103600000.095300000.071200000.071100000.071100000.071100000.049400000.039500000.0
Percentage of CommonStockSharesIssued100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:CommonClassB


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value4600000.04600000.037000000.037000000.037000000.037000000.037000000.037000000.037000000.037000000.023200000.023200000.023200000.023200000.016700000.016700000.012500000.012500000.012500000.012500000.012500000.012500000.0
Percentage of CommonStockSharesIssued15.815.915.915.916.016.016.016.026.026.017.017.417.417.516.117.517.617.617.617.625.331.6

Common Stock Shares Issued

us-gaap:StatementClassOfStock

us-gaap:CommonStockSharesOutstanding

us-gaap:CommonClassA


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value29100000.029000000.0232000000.0232000000.0231600000.0231600000.0231600000.0231200000.0142200000.0142200000.0136100000.0133100000.0133100000.0132800000.0103600000.095300000.071200000.071100000.071100000.071100000.049400000.039500000.0
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
us-gaap:CommonClassB


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value4600000.04600000.037000000.037000000.037000000.037000000.037000000.037000000.037000000.037000000.023200000.023200000.023200000.023200000.016700000.016700000.012500000.012500000.012500000.012500000.012500000.012500000.0
Percentage of CommonStockSharesOutstanding15.815.915.915.916.016.016.016.026.026.017.017.417.417.516.117.517.617.617.617.625.331.6

Common Stock Shares Outstanding

us-gaap:CommonStockSharesAuthorized



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value585000000.0585000000.0585000000.0585000000.0585000000.0585000000.0385000000.0385000000.0300000000.0300000000.0300000000.0300000000.0300000000.0300000000.0300000000.0300000000.0300000000.0300000000.0300000000.0300000000.0300000000.0300000000.0
Percentage of CommonStockSharesAuthorized100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementClassOfStock

us-gaap:CommonClassA


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312012-12-31
Value485000000.0485000000.0485000000.0485000000.0485000000.0485000000.0285000000.0285000000.0200000000.0200000000.0200000000.0200000000.0200000000.0200000000.0200000000.0200000000.0200000000.0200000000.0200000000.0
Percentage of CommonStockSharesAuthorized82.982.982.982.982.982.974.074.066.766.766.766.766.766.766.766.766.766.766.7

Common Stock Shares Authorized

us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding



Period End2020-06-302019-09-302019-06-302018-09-302018-06-302017-09-302017-06-302016-09-302016-06-302015-09-302015-06-302014-06-302013-06-302012-06-30
Value33978730.0268990399.0268990399.0268558556.0268558556.0179224094.0169963717.0156284136.0156446895.0135174756.0116725428.083966874.083591030.079911673.0
Percentage of WeightedAverageNumberOfDilutedSharesOutstanding100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Diluted Shares Outstanding

us-gaap:WeightedAverageNumberOfSharesOutstandingBasic



Period End2020-06-302019-09-302019-06-302018-09-302018-06-302017-09-302017-06-302016-09-302016-06-302015-09-302015-06-302014-06-302013-06-302012-06-30
Value33727978.0268990399.0268990399.0268558556.0268558556.0179224094.0169963717.0156284136.0156208917.0134630768.0116150985.083676425.083591030.079911673.0
Percentage of WeightedAverageNumberOfSharesOutstandingBasic100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Weighted Average Number Of Shares Outstanding Basic

us-gaap:EarningsPerShareBasic



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
Value2.911.31-0.07-0.050.03999999999999998-0.07-0.10.0-0.12-0.220.040000000000000036-0.030.140.34000000000000010.310.380.05-0.070.01
Percentage of EarningsPerShareBasic100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Basic

us-gaap:EarningsPerShareDiluted



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
Value2.891.31-0.07-0.050.03999999999999998-0.07-0.10.0-0.12-0.220.040000000000000036-0.030.140.330000000000000070.30.380.05-0.070.01
Percentage of EarningsPerShareDiluted100.0100.0100.0100.0100.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Earnings Per Share Diluted

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
Value246492000.0326835000.0182304000.0202277000.0239724000.0175915000.0171659000.0100666000.091238000.0108789000.0141351000.0104621000.0139621000.0168986000.0126401000.0107594000.044433000.043492000.051040000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.00.0100.0100.00.0100.0100.00.0100.0100.00.0100.0100.00.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, tnk:ShipToShipTransfer


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-30
Value764000.010220000.08685000.09565000.013114000.012019000.011210000.011035000.011902000.014597000.010214000.09837000.010999000.09737000.08850000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.33.14.84.75.56.86.511.013.013.47.29.47.95.87.0
Percentage of Revenues0.30.04.84.70.06.86.50.013.013.40.09.47.90.07.0
Percentage of Revenues us-gaap:OperatingSegments tnk:ShipToShipTransfer0.00.00.00.00.00.00.00.0100.0100.00.0100.0100.00.0100.0
us-gaap:OperatingSegments, tnk:Tankers


Period End2020-06-302019-06-30
Value245728000.0197442000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax99.797.6
Percentage of Revenues99.797.6
Percentage of Revenues us-gaap:OperatingSegments tnk:Tankers0.00.0

us-gaap:ProductOrService

tnk:LNGterminalmanagementconsultancyandotherOtherrevenue


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value609000.02321000.0819000.03704000.03627000.01275000.0907000.02650000.01822000.0827000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.20.70.41.81.50.70.52.62.00.8
Percentage of Revenues0.20.00.41.80.00.70.50.02.00.8
Percentage of Revenues tnk:LNGterminalmanagementconsultancyandotherOtherrevenue0.00.00.00.00.00.00.00.00.00.0
tnk:Otherrevenue


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value3580000.010768000.07361000.014016000.012387000.011542000.09947000.011374000.012914000.015458000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax1.53.34.06.95.26.65.811.314.214.2
Percentage of Revenues1.50.04.06.90.06.65.80.014.214.2
Percentage of Revenues tnk:Otherrevenue0.00.00.00.00.00.00.00.00.00.0
tnk:ShiptoshipsupportservicesOtherrevenue


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value1123000.06205000.04649000.08222000.06177000.08217000.06902000.05226000.07980000.011947000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.51.92.64.12.64.74.05.28.711.0
Percentage of Revenues0.50.02.64.10.04.74.00.08.711.0
Percentage of Revenues tnk:ShiptoshipsupportservicesOtherrevenue0.00.00.00.00.00.00.00.00.00.0
tnk:TimeChartersAframax


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value2158000.00.00.00.03923000.07784000.011021000.013989000.012318000.012451000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.90.00.00.01.64.46.413.913.511.4
Percentage of Revenues0.90.00.00.00.04.46.40.013.511.4
Percentage of Revenues tnk:TimeChartersAframax0.00.00.00.00.00.00.00.00.00.0
tnk:TimeChartersLR2


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value1828000.00.00.00.0208000.01633000.02406000.03182000.03196000.03520000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.70.00.00.00.10.91.43.23.53.2
Percentage of Revenues0.70.00.00.00.00.91.40.03.53.2
Percentage of Revenues tnk:TimeChartersLR20.00.00.00.00.00.00.00.00.00.0
tnk:TimeChartersSuezmax


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value31000000.010720000.01909000.01496000.03835000.02909000.03957000.09827000.09167000.014120000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax12.63.31.00.71.61.72.39.810.013.0
Percentage of Revenues12.60.01.00.70.01.72.30.010.013.0
Percentage of Revenues tnk:TimeChartersSuezmax0.00.00.00.00.00.00.00.00.00.0
tnk:Timecharter


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value34986000.010720000.01909000.01496000.07966000.012326000.017384000.026998000.024681000.030091000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax14.23.31.00.73.37.010.126.827.127.7
Percentage of Revenues14.20.01.00.70.07.010.10.027.127.7
Percentage of Revenues tnk:Timecharter0.00.00.00.00.00.00.00.00.00.0
tnk:VesselmanagementOtherrevenue


Period End2020-06-302019-06-30
Value1848000.02090000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax0.71.0
Percentage of Revenues0.71.0
Percentage of Revenues tnk:VesselmanagementOtherrevenue0.00.0
tnk:VoyageChartersAframax


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value59369000.091321000.051075000.048889000.042878000.029210000.024265000.012350000.04869000.06056000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax24.127.928.024.217.916.614.112.35.35.6
Percentage of Revenues24.10.028.024.20.016.614.10.05.35.6
Percentage of Revenues tnk:VoyageChartersAframax0.00.00.00.00.00.00.00.00.00.0
tnk:VoyageChartersFullServiceLightering


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value26699000.022935000.012447000.029280000.033888000.015858000.027363000.024752000.020257000.020634000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax10.87.06.814.514.19.015.924.622.219.0
Percentage of Revenues10.80.06.814.50.09.015.90.022.219.0
Percentage of Revenues tnk:VoyageChartersFullServiceLightering0.00.00.00.00.00.00.00.00.00.0
tnk:VoyageChartersLR2


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value27873000.035485000.023989000.026325000.026933000.016712000.011979000.00.00.00.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax11.310.913.213.011.29.57.00.00.00.0
Percentage of Revenues11.30.013.213.00.09.57.00.00.00.0
Percentage of Revenues tnk:VoyageChartersLR20.00.00.00.00.00.00.00.00.00.0
tnk:VoyageChartersSuezmax


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value93985000.0155606000.085523000.087001000.0115672000.090267000.080721000.0-6209000.0271000.03450000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax38.147.646.943.048.351.347.0-6.20.33.2
Percentage of Revenues38.10.046.943.00.051.347.00.00.33.2
Percentage of Revenues tnk:VoyageChartersSuezmax0.00.00.00.00.00.00.00.00.00.0
tnk:Voyagecharters


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value207926000.0305347000.0173034000.0191495000.0219371000.0152047000.0144328000.030893000.025397000.030140000.0
Percentage of RevenueFromContractWithCustomerExcludingAssessedTax84.493.494.994.791.586.484.130.727.827.7
Percentage of Revenues84.40.094.994.70.086.484.10.027.827.7
Percentage of Revenues tnk:Voyagecharters0.00.00.00.00.00.00.00.00.00.0

Revenue From Contract With Customer Excluding Assessed Tax

us-gaap:Revenues



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
Value246492000.0326835000.0182304000.0202277000.0239724000.0175915000.0171659000.0100666000.091238000.0108789000.0117704000.0104621000.0139621000.0168986000.0126401000.0107594000.044433000.043492000.051040000.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Revenues

us-gaap:CostOfGoodsAndServicesSold



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-30
Value61558000.0124561000.087726000.092668000.0110602000.083048000.086933000.015880000.018303000.019430000.0
Percentage of CostOfGoodsAndServicesSold100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues25.038.148.145.846.147.250.615.820.117.9

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, tnk:Tankers


Period End2020-06-302019-06-30
Value61558000.097398000.0
Percentage of CostOfGoodsAndServicesSold100.0105.1
Percentage of Revenues25.048.2
Percentage of Revenues us-gaap:OperatingSegments tnk:Tankers0.00.0

Cost Of Goods And Services Sold

us-gaap:OperatingCostsAndExpenses



Period End2020-06-302019-06-30
Value46218000.053600000.0
Percentage of OperatingCostsAndExpenses100.0100.0
Percentage of Revenues18.826.5

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, tnk:ShipToShipTransfer


Period End2020-06-302019-06-30
Value1078000.07419000.0
Percentage of OperatingCostsAndExpenses2.313.8
Percentage of Revenues0.43.7
Percentage of Revenues us-gaap:OperatingSegments tnk:ShipToShipTransfer0.00.0
us-gaap:OperatingSegments, tnk:Tankers


Period End2020-06-302019-06-30
Value45140000.046181000.0
Percentage of OperatingCostsAndExpenses97.786.2
Percentage of Revenues18.322.8
Percentage of Revenues us-gaap:OperatingSegments tnk:Tankers0.00.0

us-gaap:RelatedPartyTransaction

tnk:TechnicalManagementFee


Period End2020-06-302019-06-30
Value248000.00.0
Percentage of OperatingCostsAndExpenses0.50.0
Percentage of Revenues0.10.0
Percentage of Revenues tnk:TechnicalManagementFee0.00.0

Operating Costs And Expenses

us-gaap:GeneralAndAdministrativeExpense



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-06-302014-06-302013-06-302012-06-30
Value9784000.08992000.08739000.09508000.011836000.08747000.09407000.08004000.07622000.08365000.0-8977000.08214000.09503000.03039000.03163000.03362000.02322000.0
Percentage of GeneralAndAdministrativeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues4.02.84.84.74.95.05.58.08.47.7-7.67.96.82.87.17.74.5

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, tnk:ShipToShipTransfer


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-30
Value147000.01084000.0784000.0392000.0740000.0762000.0974000.0723000.0799000.0852000.01352000.0617000.01136000.0
Percentage of GeneralAndAdministrativeExpense1.512.19.04.16.38.710.49.010.510.2-15.17.512.0
Percentage of Revenues0.10.30.40.20.30.40.60.70.90.81.10.60.8
Percentage of Revenues us-gaap:OperatingSegments tnk:ShipToShipTransfer0.00.00.00.00.00.00.06.66.75.813.26.310.3
us-gaap:OperatingSegments, tnk:Tankers


Period End2020-06-302019-06-30
Value9637000.09116000.0
Percentage of GeneralAndAdministrativeExpense98.595.9
Percentage of Revenues3.94.5
Percentage of Revenues us-gaap:OperatingSegments tnk:Tankers0.00.0

General And Administrative Expense

us-gaap:OperatingIncomeLoss



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
Value92986000.091608000.0-4873000.05051000.031206000.0-2166000.0-13415000.02822000.0-13734000.01587000.05660000.0-3793000.030751000.056530000.044584000.043668000.010491000.0-5534000.06918000.0
Percentage of OperatingIncomeLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues37.728.0-2.72.513.0-1.2-7.82.8-15.11.54.8-3.622.033.535.340.623.6-12.713.6

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, tnk:ShipToShipTransfer


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-30
Value2499000.0-6000.0-1013000.01021000.0788000.0-130000.0-1041000.0-461000.0-49000.0-1142000.0-1766000.0111000.0-740000.0-516000.0322000.0
Percentage of OperatingIncomeLoss2.7-0.020.820.22.56.07.8-16.30.4-72.0-31.2-2.9-2.4-0.90.7
Percentage of Revenues1.0-0.0-0.60.50.3-0.1-0.6-0.5-0.1-1.0-1.50.1-0.5-0.30.3
Percentage of Revenues us-gaap:OperatingSegments tnk:ShipToShipTransfer0.00.00.00.00.00.00.0-4.2-0.4-7.8-17.31.1-6.7-5.33.6
us-gaap:OperatingSegments, tnk:Tankers


Period End2020-06-302019-06-30
Value90487000.04030000.0
Percentage of OperatingIncomeLoss97.379.8
Percentage of Revenues36.72.0
Percentage of Revenues us-gaap:OperatingSegments tnk:Tankers0.00.0

Operating Income Loss

us-gaap:InterestExpense



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
Value13492000.015679000.016134000.016607000.016987000.015006000.013931000.09613000.07299000.07076000.07363000.06809000.07341000.07730000.04008000.03075000.02274000.02604000.06654000.0
Percentage of InterestExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues5.54.88.98.27.18.58.19.58.06.56.36.55.34.63.22.95.16.013.0

Interest Expense

us-gaap:OtherNonoperatingIncomeExpense



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
Value940000.0-487000.0933000.0614000.07122000.0-799000.0-1273000.0917000.0-1768000.0-2761000.0-1938000.0453000.0-1940000.0-1259000.0-1385000.0-474000.0-89000.0-354000.0-703000.0
Percentage of OtherNonoperatingIncomeExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues0.4-0.10.50.33.0-0.5-0.70.9-1.9-2.5-1.60.4-1.4-0.7-1.1-0.4-0.2-0.8-1.4

Other Nonoperating Income Expense

us-gaap:IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest



Period End2020-06-302019-06-30
Value83600000.0-12668000.0
Percentage of IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest100.0100.0
Percentage of Revenues33.9-6.3

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

us-gaap:IncomeTaxExpenseBenefit



Period End2020-06-302019-06-30
Value-14598000.01639000.0
Percentage of IncomeTaxExpenseBenefit100.0100.0
Percentage of Revenues-5.90.8

Income Tax Expense Benefit

us-gaap:ProfitLoss



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
Value98198000.0106839000.063072000.0-19850000.0-14307000.012447000.011502000.0-17484000.0-27413000.0-19153000.0-1879000.0-22380000.0-37477000.06846000.0-5457000.022486000.053559000.040950000.044242000.04589000.0-5724000.0-4323000.0
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues39.80.019.3-10.9-7.10.04.8-9.9-16.00.0-1.9-24.5-34.45.8-5.216.131.732.441.110.3-13.2-8.5

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-30
Value98198000.0106839000.0-19850000.0-14307000.012447000.011502000.0-17484000.0-27413000.0-19153000.0-1879000.0-22380000.06846000.0-5457000.0
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues39.80.0-10.9-7.10.04.8-9.9-16.00.0-1.9-24.55.8-5.2
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:Assets



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value2071966000.02229476000.02170138000.02153928000.02161086000.02129194000.02140696000.02197348000.01735953000.01803426000.01932425000.01957784000.02063730000.02169476000.01314155000.01165359000.0977499000.01097529000.01091833000.01105656000.0881926000.0936517000.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:StatementBusinessSegments

tnk:ShipToShipTransfer


Period End2020-06-302019-12-312019-09-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-31
Value0.033709000.033560000.036315000.038135000.035558000.036810000.039663000.040947000.026468000.030499000.029950000.074381000.0
Percentage of Assets0.01.51.51.71.81.71.72.32.31.41.61.53.4
Percentage of Assets0.01.51.51.71.81.71.72.32.31.41.61.53.4
Percentage of Assets tnk:ShipToShipTransfer0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
tnk:Tankers


Period End2020-06-302019-12-312018-12-31
Value1904059000.02106943000.02069854000.0
Percentage of Assets91.994.595.8
Percentage of Assets91.994.595.8
Percentage of Assets tnk:Tankers100.0100.0100.0

Assets

us-gaap:Liabilities



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value876167000.01239556000.01243851000.01208033000.01214153000.01193983000.01188226000.01190747000.0873525000.0913457000.01011801000.01047110000.01138413000.01292015000.0731333000.0709636000.0664808000.0812857000.0802158000.0803473000.0392555000.0493828000.0
Percentage of Liabilities100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets42.355.657.356.156.256.155.554.250.350.752.453.555.259.655.760.968.074.173.572.744.552.7

Liabilities

us-gaap:LiabilitiesAndStockholdersEquity



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value2071966000.02229476000.02170138000.02153928000.02161086000.02129194000.02140696000.02197348000.01735953000.01803426000.01932425000.01957784000.02063730000.02169476000.01314155000.01165359000.0977499000.01097529000.01091833000.01105656000.0881926000.0936517000.0
Percentage of LiabilitiesAndStockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Liabilities And Stockholders Equity

us-gaap:StockholdersEquity



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value1195799000.01097227000.0989920000.0926287000.0945895000.0960048000.0946933000.0935211000.0952470000.0979735000.01006601000.0862428000.0889969000.0920624000.0910674000.0925317000.0877461000.0582822000.0455723000.0312691000.0284672000.0289675000.0302183000.0489371000.0442689000.0
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets57.70.044.442.743.90.043.843.944.50.045.849.749.347.646.544.840.444.339.132.025.926.527.355.547.3

us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStockIncludingAdditionalPaidInCapital


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312012-12-312011-12-312010-12-31
Value1209865000.01209491000.01209023000.01208461000.01208219000.01208065000.01207397000.01207177000.01206953000.01206805000.01206466000.01055037000.01054821000.01040669000.01032876000.01032687000.01032239000.0836536000.0785515000.0673841000.0673092000.0672435000.0588316000.0481211000.0
Percentage of StockholdersEquity101.2110.2122.1130.5127.7125.8127.5129.1126.7123.2119.9122.3118.5113.0113.4111.6117.6143.5172.4215.5236.4222.5120.2108.7
Percentage of Assets58.40.054.255.756.10.055.956.756.40.054.960.858.553.952.850.047.663.767.468.961.360.866.751.4
Percentage of Assets us-gaap:CommonClassA us-gaap:CommonStockIncludingAdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:CommonClassB, us-gaap:CommonStockIncludingAdditionalPaidInCapital


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312012-12-312011-12-312010-12-31
Value88532000.088532000.088532000.088532000.088532000.088532000.088532000.088532000.088532000.088532000.088532000.088532000.088532000.062635000.062635000.062635000.062635000.017135000.017135000.0125000.0125000.0125000.0125000.0125000.0
Percentage of StockholdersEquity7.48.18.99.69.49.29.39.59.39.08.810.39.96.86.96.87.12.93.80.00.00.00.00.0
Percentage of Assets4.30.04.04.14.10.04.14.24.10.04.05.14.93.23.23.02.91.31.50.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassB us-gaap:CommonStockIncludingAdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312012-12-312011-12-31
Value-102598000.0-200796000.0-307635000.0-370706000.0-350856000.0-336549000.0-348996000.0-360498000.0-343015000.0-315602000.0-288397000.0-281141000.0-253384000.0-182680000.0-184837000.0-170005000.0-217413000.0-270849000.0-346927000.0-361275000.0-388545000.0-370377000.0-99070000.0
Percentage of StockholdersEquity-8.6-18.3-31.1-40.0-37.1-35.1-36.9-38.5-36.0-32.2-28.7-32.6-28.5-19.8-20.3-18.4-24.8-46.5-76.1-115.5-136.5-122.6-20.2
Percentage of Assets-5.00.0-13.8-17.1-16.30.0-16.1-16.9-16.00.0-13.1-16.2-14.1-9.5-9.4-8.2-10.0-20.6-29.8-37.0-35.4-33.5-11.2
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity

us-gaap:AssetsCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value348917000.0421225000.0261544000.0228478000.0225591000.0177799000.0168329000.0176685000.0149187000.0178992000.0215484000.0186814000.0251181000.0279814000.0191760000.0253614000.083241000.0215071000.0204721000.0202965000.036747000.038037000.0
Percentage of AssetsCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets16.818.912.110.610.48.47.98.08.69.911.29.512.212.914.621.88.519.618.818.44.24.1

Assets Current

us-gaap:CashAndCashEquivalentsAtCarryingValue



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312012-06-302011-12-312010-12-312009-12-312008-12-31
Value167907000.088824000.076705000.035429000.054917000.054361000.048457000.071439000.060606000.087255000.068108000.059237000.058018000.096417000.080579000.083082000.0162797000.021764000.025646000.037708000.026341000.018554000.015859000.012450000.010432000.026698000.0
Percentage of CashAndCashEquivalentsAtCarryingValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets8.14.03.51.62.52.62.33.33.54.83.53.02.84.40.06.314.02.22.33.52.40.01.81.30.00.0

us-gaap:LongLivedAssetsHeldForSaleByAssetType

us-gaap:CashAndCashEquivalents


Period End2020-06-302019-12-312019-06-302018-12-31
Value0.01121000.00.00.0
Percentage of CashAndCashEquivalentsAtCarryingValue0.01.30.00.0
Percentage of Assets0.00.10.00.0
Percentage of Assets us-gaap:CashAndCashEquivalents0.00.00.00.0

Cash And Cash Equivalents At Carrying Value

us-gaap:AccountsReceivableNetCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value88663000.095648000.052245000.051451000.017365000.017048000.015912000.019288000.022484000.018187000.030247000.025245000.043611000.028313000.011344000.04178000.02545000.04247000.07633000.04523000.0157000.0175000.0
Percentage of AccountsReceivableNetCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets4.34.32.42.40.80.80.70.91.31.01.61.32.11.30.90.40.30.40.70.40.00.0

Accounts Receivable Net Current

us-gaap:InventoryNet



Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value30885000.049790000.050473000.063441000.023179000.0
Percentage of InventoryNet100.0100.0100.0100.0100.0
Percentage of Assets1.52.22.32.91.1

Inventory Net

us-gaap:PropertyPlantAndEquipmentNet



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value1683734000.01769726000.01859733000.01875855000.01401551000.01556959000.01695722000.01737792000.01283989000.01554055000.01605372000.01664859000.01706288000.01767925000.01035311000.0828291000.0841013000.0859308000.0867035000.0885992000.01310496000.01435478000.0
Percentage of PropertyPlantAndEquipmentNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets81.379.485.787.164.973.179.279.174.086.283.185.082.781.578.871.186.078.379.480.1148.6153.3

Property Plant And Equipment Net

us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312013-12-312013-06-302012-12-31
Value29740000.028112000.026418000.026351000.025766000.024811000.025170000.025460000.042927000.043201000.081273000.078771000.077862000.086808000.079566000.073397000.08366000.07289000.03457000.0
Percentage of InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.41.31.21.21.21.21.21.22.52.44.24.03.84.06.16.30.80.70.3

Investments In Affiliates Subsidiaries Associates And Joint Ventures

us-gaap:Goodwill



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312011-12-312010-12-31
Value2426000.02426000.08059000.08059000.08059000.08059000.08059000.08059000.08059000.08059000.08059000.08059000.08059000.00.00.013310000.0
Percentage of Goodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0100.0
Percentage of Assets0.10.10.40.40.40.40.40.40.50.40.40.40.40.00.01.4

Goodwill

us-gaap:IntangibleAssetsNetExcludingGoodwill



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-31
Value2259000.02545000.09955000.010498000.011625000.012320000.013030000.014605000.015262000.016044000.017658000.018491000.019342000.029619000.0
Percentage of IntangibleAssetsNetExcludingGoodwill100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.50.50.50.60.60.70.90.90.90.90.91.4

Intangible Assets Net Excluding Goodwill

us-gaap:OtherAssetsNoncurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value1453000.01923000.0910000.01010000.074000.082000.092000.0127000.0139000.0155000.041000.073000.082000.0146000.01992000.05400000.04564000.04954000.02958000.06869000.01938000.01889000.0
Percentage of OtherAssetsNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.10.10.00.00.00.00.00.00.00.00.00.00.00.00.20.50.50.50.30.60.20.2

Other Assets Noncurrent

us-gaap:LiabilitiesCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value185818000.0279705000.0295414000.0269501000.0197761000.0179231000.0241927000.0236714000.0223623000.0224096000.0236922000.0222093000.0228798000.0289652000.0187787000.079718000.086507000.070194000.072748000.061830000.022076000.024528000.0
Percentage of LiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets9.012.513.612.59.28.411.310.812.912.412.311.311.113.414.36.88.86.46.75.62.52.6

Liabilities Current

us-gaap:LongTermDebtCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value27549000.043573000.0101295000.0101264000.0106236000.0103843000.0155089000.0166745000.0159087000.0150254000.0171019000.0155690000.0151761000.0174047000.0144453000.041959000.051959000.025246000.025246000.025246000.01800000.01800000.0
Percentage of LongTermDebtCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.32.04.74.74.94.97.27.69.28.38.88.07.48.011.03.65.32.32.32.30.20.2

Long Term Debt Current

us-gaap:AccountsPayableCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value59652000.070978000.054824000.047532000.011146000.05352000.05822000.07860000.010353000.09253000.012265000.09858000.010784000.016717000.05747000.01899000.03388000.02251000.02098000.03346000.01935000.02124000.0
Percentage of AccountsPayableCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets2.93.22.52.20.50.30.30.40.60.50.60.50.50.80.40.20.30.20.20.30.20.2

Accounts Payable Current

us-gaap:AccruedLiabilitiesCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value40360000.059735000.046519000.056448000.040856000.035717000.034063000.034608000.029756000.026157000.027224000.026259000.047121000.062029000.018218000.017565000.014971000.021069000.014543000.017882000.07423000.07949000.0
Percentage of AccruedLiabilitiesCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.92.72.12.61.91.71.61.61.71.51.41.32.32.91.41.51.51.91.31.60.80.8

Accrued Liabilities Current

us-gaap:OperatingLeaseLiabilityCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value10986000.016290000.016405000.012224000.00.0
Percentage of OperatingLeaseLiabilityCurrent100.0100.0100.0100.00.0
Percentage of Assets0.50.70.80.60.0

Operating Lease Liability Current

us-gaap:OtherLiabilitiesCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312013-12-312012-12-312011-12-312010-12-31
Value8485000.08567000.0255000.0316000.00.0528000.0130000.0115000.0277000.0
Percentage of OtherLiabilitiesCurrent100.0100.0100.0100.00.0100.0100.0100.0100.0
Percentage of Assets0.40.40.00.00.00.00.00.00.0

Other Liabilities Current

us-gaap:ProductOrService

us-gaap:ContractWithCustomerLiabilityCurrent

tnk:Timecharter


Period End2020-06-302019-12-312018-12-312018-09-302018-06-302017-12-31
Value7700000.07500000.00.0100000.00.0500000.0
Percentage of ContractWithCustomerLiabilityCurrent100.0100.00.0100.00.0100.0
Percentage of Assets0.40.30.00.00.00.0
Percentage of Assets tnk:Timecharter0.00.00.00.00.00.0

Contract With Customer Liability Current

us-gaap:LongTermDebt



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-31
Value312938000.0559679000.0608960000.0593226000.0735406000.0807078000.0933817000.0952302000.0645905000.0821786000.0933016000.0966651000.01044270000.01164605000.0674672000.0656063000.0609398000.0744634000.0730214000.0735701000.0908730000.0
Percentage of LongTermDebt100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets15.125.128.127.534.037.943.643.337.245.648.349.450.653.751.356.362.367.866.966.5103.0

us-gaap:DebtInstrument, us-gaap:SubsequentEventType

tnk:TermLoanDue2023, us-gaap:SubsequentEvent


Period End2020-08-01
Value67400000.0
Percentage of LongTermDebt0.0
Percentage of Assets0.0
Percentage of Assets tnk:TermLoanDue2023 us-gaap:SubsequentEvent0.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value312938000.0559679000.0608960000.0593226000.0735406000.0
Percentage of LongTermDebt100.0100.0100.0100.0100.0
Percentage of Assets15.125.128.127.534.0
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:CarryingReportedAmountFairValueDisclosure us-gaap:FairValueMeasurementsRecurring0.00.00.00.00.0
us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-31
Value314792000.0558657000.0
Percentage of LongTermDebt100.699.8
Percentage of Assets15.225.1
Percentage of Assets us-gaap:FairValueInputsLevel2 us-gaap:EstimateOfFairValueFairValueDisclosure us-gaap:FairValueMeasurementsRecurring0.00.0

Long Term Debt

us-gaap:LongTermDebtNoncurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value285389000.0516106000.0507665000.0491962000.0629170000.0703235000.0778728000.0785557000.0486818000.0671532000.0761997000.0810961000.0892509000.0990558000.0530219000.0614104000.0557439000.0719388000.0704968000.0710455000.0347100000.0452228000.0
Percentage of LongTermDebtNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets13.823.123.422.829.133.036.435.828.037.239.441.443.245.740.352.757.065.564.664.339.448.3

Long Term Debt Noncurrent

us-gaap:OtherLiabilitiesNoncurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-312009-12-31
Value27516000.051044000.037474000.037166000.032829000.030646000.029620000.026795000.019226000.017829000.013683000.05444000.05351000.04902000.04757000.03228000.02733000.04102000.0
Percentage of OtherLiabilitiesNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets1.32.31.71.71.51.41.41.21.11.00.70.60.50.40.40.40.30.0

Other Liabilities Noncurrent

us-gaap:OperatingLeaseLiabilityNoncurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value417000.03270000.07190000.06865000.00.0
Percentage of OperatingLeaseLiabilityNoncurrent100.0100.0100.0100.00.0
Percentage of Assets0.00.10.30.30.0

Operating Lease Liability Noncurrent

us-gaap:StockholdersEquity



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value1195799000.01097227000.0989920000.0926287000.0945895000.0960048000.0946933000.0935211000.0952470000.0979735000.01006601000.0862428000.0889969000.0920624000.0910674000.0925317000.0877461000.0582822000.0455723000.0312691000.0284672000.0289675000.0302183000.0489371000.0442689000.0
Percentage of StockholdersEquity100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets57.70.044.442.743.90.043.843.944.50.045.849.749.347.646.544.840.444.339.132.025.926.527.355.547.3

us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStockIncludingAdditionalPaidInCapital


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312012-12-312011-12-312010-12-31
Value1209865000.01209491000.01209023000.01208461000.01208219000.01208065000.01207397000.01207177000.01206953000.01206805000.01206466000.01055037000.01054821000.01040669000.01032876000.01032687000.01032239000.0836536000.0785515000.0673841000.0673092000.0672435000.0588316000.0481211000.0
Percentage of StockholdersEquity101.2110.2122.1130.5127.7125.8127.5129.1126.7123.2119.9122.3118.5113.0113.4111.6117.6143.5172.4215.5236.4222.5120.2108.7
Percentage of Assets58.40.054.255.756.10.055.956.756.40.054.960.858.553.952.850.047.663.767.468.961.360.866.751.4
Percentage of Assets us-gaap:CommonClassA us-gaap:CommonStockIncludingAdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0
us-gaap:CommonClassB, us-gaap:CommonStockIncludingAdditionalPaidInCapital


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312012-12-312011-12-312010-12-31
Value88532000.088532000.088532000.088532000.088532000.088532000.088532000.088532000.088532000.088532000.088532000.088532000.088532000.062635000.062635000.062635000.062635000.017135000.017135000.0125000.0125000.0125000.0125000.0125000.0
Percentage of StockholdersEquity7.48.18.99.69.49.29.39.59.39.08.810.39.96.86.96.87.12.93.80.00.00.00.00.0
Percentage of Assets4.30.04.04.14.10.04.14.24.10.04.05.14.93.23.23.02.91.31.50.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassB us-gaap:CommonStockIncludingAdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312012-12-312011-12-31
Value-102598000.0-200796000.0-307635000.0-370706000.0-350856000.0-336549000.0-348996000.0-360498000.0-343015000.0-315602000.0-288397000.0-281141000.0-253384000.0-182680000.0-184837000.0-170005000.0-217413000.0-270849000.0-346927000.0-361275000.0-388545000.0-370377000.0-99070000.0
Percentage of StockholdersEquity-8.6-18.3-31.1-40.0-37.1-35.1-36.9-38.5-36.0-32.2-28.7-32.6-28.5-19.8-20.3-18.4-24.8-46.5-76.1-115.5-136.5-122.6-20.2
Percentage of Assets-5.00.0-13.8-17.1-16.30.0-16.1-16.9-16.00.0-13.1-16.2-14.1-9.5-9.4-8.2-10.0-20.6-29.8-37.0-35.4-33.5-11.2
Percentage of Assets us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.00.0

Stockholders Equity

us-gaap:CommonStocksIncludingAdditionalPaidInCapital



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-31
Value1298397000.01297555000.01296993000.01296751000.01295929000.01295709000.01295485000.01294998000.01143569000.01143353000.01103304000.01095511000.01095322000.01094874000.0853671000.0802650000.0673966000.0673217000.0672744000.0672560000.0
Percentage of CommonStocksIncludingAdditionalPaidInCapital100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets62.758.259.860.260.060.960.558.965.963.457.156.053.150.565.068.968.961.361.660.8

Common Stocks Including Additional Paid In Capital

us-gaap:RetainedEarningsAccumulatedDeficit



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value-102598000.0-307635000.0-370706000.0-350856000.0-348996000.0-360498000.0-343015000.0-288397000.0-281141000.0-253384000.0-182680000.0-184837000.0-170005000.0-217413000.0-270849000.0-346927000.0-361275000.0-388545000.0-383069000.0-370377000.0-99070000.0-38647000.0
Percentage of RetainedEarningsAccumulatedDeficit100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets-5.0-13.8-17.1-16.3-16.1-16.9-16.0-13.1-16.2-14.1-9.5-9.4-8.2-10.0-20.6-29.8-37.0-35.4-35.1-33.5-11.2-4.1

Retained Earnings Accumulated Deficit

us-gaap:AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue



Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-30
Value374000.0468000.0242000.0154000.0668000.0235000.0224000.0148000.0613000.0167000.0216000.0235000.0189000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.0

us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents

us-gaap:CommonClassA, us-gaap:CommonStockIncludingAdditionalPaidInCapital


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-30
Value374000.0468000.0242000.0154000.0668000.0235000.0224000.0148000.0613000.0167000.0216000.0235000.0189000.0
Percentage of AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Assets0.00.00.00.00.00.00.00.00.00.00.00.00.0
Percentage of Assets us-gaap:CommonClassA us-gaap:CommonStockIncludingAdditionalPaidInCapital0.00.00.00.00.00.00.00.00.00.00.00.00.0

Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value

us-gaap:ProfitLoss



Period End2020-06-302020-03-312019-12-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
Value98198000.0106839000.063072000.0-19850000.0-14307000.012447000.011502000.0-17484000.0-27413000.0-19153000.0-1879000.0-22380000.0-37477000.06846000.0-5457000.022486000.053559000.040950000.044242000.04589000.0-5724000.0-4323000.0
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues39.80.019.3-10.9-7.10.04.8-9.9-16.00.0-1.9-24.5-34.45.8-5.216.131.732.441.110.3-13.2-8.5

us-gaap:StatementEquityComponents

us-gaap:RetainedEarnings


Period End2020-06-302020-03-312019-09-302019-06-302019-03-312018-12-312018-09-302018-06-302018-03-312017-12-312017-09-302016-12-312016-09-30
Value98198000.0106839000.0-19850000.0-14307000.012447000.011502000.0-17484000.0-27413000.0-19153000.0-1879000.0-22380000.06846000.0-5457000.0
Percentage of ProfitLoss100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
Percentage of Revenues39.80.0-10.9-7.10.04.8-9.9-16.00.0-1.9-24.55.8-5.2
Percentage of Revenues us-gaap:RetainedEarnings0.00.00.00.00.00.00.00.00.00.00.00.00.0

Profit Loss

us-gaap:UnrecognizedTaxBenefits



Period End2020-06-302019-12-312019-09-302019-06-302019-01-012018-12-312018-09-302018-06-302018-01-012017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312014-12-312013-12-31
Value35749000.049579000.036240000.035792000.032059000.032059000.029912000.028911000.026054000.026054000.018471000.017061000.012882000.011208000.011844000.07597000.04852000.05351000.0
Percentage of UnrecognizedTaxBenefits100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

Unrecognized Tax Benefits

us-gaap:OperatingLeaseRightOfUseAsset



Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value10758000.019600000.023595000.019089000.00.0
Percentage of OperatingLeaseRightOfUseAsset100.0100.0100.0100.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsNonrecurring


Period End2020-06-30
Value10758000.0
Percentage of OperatingLeaseRightOfUseAsset100.0
us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsNonrecurring


Period End2020-06-30
Value10758000.0
Percentage of OperatingLeaseRightOfUseAsset100.0

Operating Lease Right Of Use Asset

us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312015-12-31
Value176110000.096790000.082483000.040782000.060507000.058827000.052987000.075710000.064923000.088635000.094907000.0157390000.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel1, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312015-12-31
Value176110000.095332000.082483000.040782000.060507000.058827000.072007000.075710000.064923000.088635000.094907000.0157390000.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.098.5100.0100.0100.0100.0135.9100.0100.0100.0100.0100.0
us-gaap:FairValueInputsLevel1, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312015-12-31
Value176110000.095332000.082483000.040782000.060507000.058827000.072007000.075710000.064923000.088635000.094907000.0157390000.0
Percentage of CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents100.098.5100.0100.0100.0100.0135.9100.0100.0100.0100.0100.0

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents

tnk:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsRealizedGainLossNet



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-30
Value-114000.01492000.01048000.0800000.01015000.0592000.0656000.0-177000.080000.0139000.0280000.0-181000.0-1150000.0-2398000.0-2476000.0-2452000.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsRealizedGainLossNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

tnk:FreightForwardAgreements


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-30
Value-200000.01096000.0435000.0-29000.0274000.0-119000.0-18000.0-77000.0234000.080000.00.00.00.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsRealizedGainLossNet175.473.541.5-3.627.0-20.1-2.743.5292.557.60.0-0.0-0.0
us-gaap:InterestRateSwap


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302013-06-302012-06-30
Value86000.0396000.0613000.0829000.0741000.0711000.0674000.0-100000.0-154000.0-301000.0-652000.0-1277000.0-1276000.0-2398000.0-2476000.0-2452000.02500000.02400000.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsRealizedGainLossNet-75.426.558.5103.673.0120.1102.756.5-192.5-216.5-232.9705.5111.0100.0100.0100.00.00.0

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecurities, us-gaap:StatementClassOfStock

us-gaap:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

us-gaap:EmployeeStockOption, us-gaap:CommonClassA


Period End2020-06-302019-06-302018-09-302018-06-302017-09-302017-06-302016-09-302016-06-30
Value200000.015000.02900000.02900000.01700000.01700000.0800000.0800000.0
Percentage of AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DepreciationAndAmortization



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
Value29546000.031943000.031536000.030658000.029916000.029595000.029573000.026829000.024328000.024415000.025573000.025888000.025621000.025414000.017878000.015227000.012425000.011921000.018047000.0
Percentage of DepreciationAndAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, tnk:ShipToShipTransfer


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-30
Value121000.0897000.0902000.0733000.01025000.01063000.01119000.01253000.01257000.01258000.01474000.01237000.01301000.0998000.0644000.0
Percentage of DepreciationAndAmortization0.42.82.92.43.43.63.84.75.25.25.84.85.13.93.6
us-gaap:OperatingSegments, tnk:Tankers


Period End2020-06-302019-06-30
Value29425000.029925000.0
Percentage of DepreciationAndAmortization99.697.6

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-30
Value-589000.0205000.01453000.0-1778000.0-1693000.0596000.01116000.02028000.0390000.0-1560000.06938000.03629000.0-3750000.0498000.0-1031000.0523000.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

tnk:FreightForwardAgreements


Period End2020-06-302019-09-302019-06-302018-09-302018-06-302017-09-302017-06-302016-09-302016-06-30
Value-192000.01381000.092000.0-128000.016000.0143000.050000.00.00.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet32.695.0-5.2-21.51.436.7-3.20.0-0.0
us-gaap:InterestRateSwap


Period End2020-06-302019-09-302019-06-302018-09-302018-06-302017-09-302017-06-302016-09-302016-06-302015-09-302015-06-30
Value-397000.072000.0-1870000.0724000.01100000.0247000.0-1402000.02523000.0-3084000.0-926000.0-386000.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet67.45.0105.2121.598.663.389.969.582.289.8-73.8

us-gaap:IncomeStatementLocation

us-gaap:EmployeeBenefitsAndShareBasedCompensation

us-gaap:GeneralAndAdministrativeExpense


Period End2020-06-302019-06-30
Value600000.0200000.0
Percentage of EmployeeBenefitsAndShareBasedCompensation100.0100.0

us-gaap:ForeignCurrencyTransactionGainLossBeforeTax



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-30
Value-87000.0-614000.0918000.0595000.0-2892000.01251000.04794000.0-72000.081000.0-3000.01723000.0-35000.0-76000.0406000.0-42000.0-65000.0
Percentage of ForeignCurrencyTransactionGainLossBeforeTax100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentByType

us-gaap:GainLossOnDispositionOfAssets

tnk:SuezmaxTankerHeldForSale


Period End2020-06-302020-03-31
Value500000.0-500000.0
Percentage of GainLossOnDispositionOfAssets100.0100.0

us-gaap:SubsequentEventType

us-gaap:GainLossOnSaleOfPropertyPlantEquipment

us-gaap:SubsequentEvent


Period End2020-03-31
Value2700000.0
Percentage of GainLossOnSaleOfPropertyPlantEquipment100.0

us-gaap:GainLossOnSalesOfAssetsAndAssetImpairmentCharges



Period End2020-06-302019-06-30
Value2896000.00.0
Percentage of GainLossOnSalesOfAssetsAndAssetImpairmentCharges100.00.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, tnk:ShipToShipTransfer


Period End2020-06-30
Value3081000.0
Percentage of GainLossOnSalesOfAssetsAndAssetImpairmentCharges106.4
us-gaap:OperatingSegments, tnk:Tankers


Period End2020-06-30
Value-185000.0
Percentage of GainLossOnSalesOfAssetsAndAssetImpairmentCharges-6.4

us-gaap:IncomeLossFromEquityMethodInvestments



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-30
Value3188000.01648000.068000.0-169000.0955000.0-359000.0-70000.01774000.0-274000.0-28027000.03501000.01045000.04740000.05480000.02762000.03587000.015000.0-167000.0
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, tnk:Tankers


Period End2020-06-302019-06-30
Value3188000.0-169000.0
Percentage of IncomeLossFromEquityMethodInvestments100.0100.0

us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-30
Value250752.0113536.00.00.00.00.00.00.00.00.0-24052.00.0237978.010685.0543988.0574443.0290449.0
Percentage of IncrementalCommonSharesAttributableToShareBasedPaymentArrangements100.0100.00.00.00.00.00.00.00.00.0100.00.0100.0100.0100.0100.0100.0

us-gaap:InvestmentIncomeInterest



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-30
Value567000.0147000.0138000.0221000.0311000.0250000.0160000.0163000.0305000.0360000.047000.018000.026000.040000.028000.08000.060000.020000.0
Percentage of InvestmentIncomeInterest100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:LeaseAndRentalExpense



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-302012-06-30
Value9296000.012312000.010637000.010792000.04841000.04317000.05697000.03202000.05835000.07997000.011683000.011335000.015913000.021720000.021382000.016793000.01112000.01951000.0644000.0
Percentage of LeaseAndRentalExpense100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments

us-gaap:OperatingSegments, tnk:ShipToShipTransfer


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-30
Value0.01584000.01306000.00.01630000.01382000.01584000.01234000.01206000.01062000.0985000.0551000.0457000.00.038000.0
Percentage of LeaseAndRentalExpense0.012.912.30.033.732.027.838.520.713.38.44.92.90.00.2
us-gaap:OperatingSegments, tnk:Tankers


Period End2020-06-302019-06-30
Value9296000.010792000.0
Percentage of LeaseAndRentalExpense100.0100.0

us-gaap:OtherNonoperatingIncome



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-30
Value1027000.0127000.015000.019000.00.00.019000.023000.015000.0186000.0-34000.00.0160000.049000.00.00.0
Percentage of OtherNonoperatingIncome100.0100.0100.0100.00.00.0100.0100.0100.0100.0100.00.0100.0100.00.00.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments

us-gaap:ProceedsFromDivestitureOfBusinesses

tnk:ShipToShipTransferBusiness, tnk:ShipToShipTransferBusiness


Period End2020-06-302020-04-30
Value27100000.014300000.0
Percentage of ProceedsFromDivestitureOfBusinesses100.0100.0

us-gaap:IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperations, us-gaap:StatementBusinessSegments, us-gaap:SubsequentEventType

tnk:ShipToShipTransferBusiness, tnk:ShipToShipTransferBusiness, us-gaap:SubsequentEvent


Period End2020-07-31
Value12700000.0
Percentage of ProceedsFromDivestitureOfBusinesses0.0

us-gaap:RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-302014-06-302013-06-30
Value7143000.08243000.07437000.07950000.07714000.07875000.08633000.07507000.06761000.04253000.02661000.02471000.02775000.03043000.01594000.01777000.02466000.02717000.0
Percentage of RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RelatedPartyTransaction

tnk:SecondmentFees


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-30
Value144000.065000.021000.040000.0131000.0189000.0142000.0194000.0148000.00.00.00.0
Percentage of RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty2.00.80.30.51.72.41.62.62.20.00.00.0

us-gaap:RelatedPartyTransaction

us-gaap:RevenueFromRelatedParties

tnk:LNGterminalservices


Period End2020-06-302019-09-302019-06-302018-09-302018-06-302017-09-302017-06-302016-09-302016-06-30
Value0.0-150000.01000000.072000.031000.084000.084000.00.00.0
Percentage of RevenueFromRelatedParties0.0100.0100.0100.0100.0100.0100.00.00.0
tnk:Technicalmanagementfeerevenue


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-30
Value169000.0169000.0169000.0169000.03992000.03490000.03171000.02618000.03828000.01220000.00.00.0
Percentage of RevenueFromRelatedParties0.00.0-112.716.90.04847.210229.00.04557.11452.40.00.0
us-gaap:OtherIncome


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-30
Value0.03000.0100000.067000.0261000.0343000.0254000.0659000.01003000.0277000.00.00.00.0
Percentage of RevenueFromRelatedParties0.00.0-66.76.70.0476.4819.40.01194.0329.80.00.00.0

us-gaap:StatementEquityComponents

us-gaap:StockIssuedDuringPeriodSharesEmployeeBenefitPlan

us-gaap:CommonStockIncludingAdditionalPaidInCapital


Period End2020-06-302020-03-312019-06-302019-03-312018-06-302018-03-31
Value26000.057000.00.0432000.00.0357000.0
Percentage of StockIssuedDuringPeriodSharesEmployeeBenefitPlan100.0100.00.0100.00.0100.0

us-gaap:UnrealizedGainLossOnDerivatives



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-30
Value-475000.0-1287000.0405000.0-2578000.0-2708000.04000.0460000.02205000.0310000.0-1699000.06658000.03810000.0-2600000.02896000.01445000.02975000.0
Percentage of UnrealizedGainLossOnDerivatives100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk

tnk:FreightForwardAgreements


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-30
Value8000.0-1079000.0946000.0121000.0-82000.0-9000.034000.0108000.0-91000.0-30000.00.00.00.0
Percentage of UnrealizedGainLossOnDerivatives-1.783.8233.6-4.73.0-225.07.44.9-29.41.80.00.0-0.0
us-gaap:InterestRateSwap


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-09-302015-06-30
Value-483000.0-208000.0-541000.0-2699000.0-2626000.013000.0426000.02097000.0401000.0-1101000.07767000.03800000.0-1808000.03153000.01550000.02066000.0
Percentage of UnrealizedGainLossOnDerivatives101.716.2-133.6104.797.0325.092.695.1129.464.8116.799.769.5108.9107.369.4

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis

tnk:AccruedLiabilitiesReceivablesCurrent

tnk:FreightForwardAgreements, us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312018-09-302018-06-30
Value0.00.04000.08000.0
Percentage of AccruedLiabilitiesReceivablesCurrent0.00.0100.0100.0
us-gaap:InterestRateSwap, us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312018-09-302018-06-302017-12-31
Value0.0230000.0-394000.0-389000.039000.0
Percentage of AccruedLiabilitiesReceivablesCurrent0.00.0-9850.0-4862.50.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312018-09-302018-06-302017-12-31
Value0.0230000.0-390000.0-381000.039000.0
Percentage of AccruedLiabilitiesReceivablesCurrent0.00.0-9750.0-4762.50.0

us-gaap:DebtInstrument

tnk:ActualHullCoverageRatio

tnk:A2020DebtFacilityMaturinginDecember2024


Period End2020-06-30
Value3.79
Percentage of ActualHullCoverageRatio100.0

us-gaap:PropertyPlantAndEquipmentByType, us-gaap:SaleLeasebackTransactionDescription

tnk:SuezmaxAframaxandLR2SaleLeaseback, tnk:November2018SaleleasebackTransaction


Period End2020-06-302019-12-312019-09-302018-12-31
Value1.631.581.531.22
Percentage of ActualHullCoverageRatio43.00.00.00.0

us-gaap:SaleLeasebackTransactionDescription

tnk:July2017SaleLeaseback


Period End2020-06-302019-12-31
Value1.291.22
Percentage of ActualHullCoverageRatio34.00.0
tnk:May2019SaleLeaseback


Period End2020-06-302019-12-31
Value1.021.09
Percentage of ActualHullCoverageRatio26.90.0
tnk:September2018SaleLeaseback


Period End2020-06-302019-12-31
Value1.11.15
Percentage of ActualHullCoverageRatio29.00.0

tnk:LeaseObligationType

tnk:DebtCovenantMinimumFreeLiquidityAndUndrawnRevolvingCreditLine

tnk:FinanceLeaseObligations


Period End2020-06-30
Value35000000.0
Percentage of DebtCovenantMinimumFreeLiquidityAndUndrawnRevolvingCreditLine100.0

us-gaap:DebtInstrument

tnk:A2020DebtFacilityMaturinginDecember2024


Period End2020-06-30
Value35000000.0
Percentage of DebtCovenantMinimumFreeLiquidityAndUndrawnRevolvingCreditLine100.0
tnk:TermLoanDue2023


Period End2020-06-30
Value35000000.0
Percentage of DebtCovenantMinimumFreeLiquidityAndUndrawnRevolvingCreditLine100.0

tnk:LeaseObligationType

tnk:DebtCovenantMinimumFreeLiquidityAndUndrawnRevolvingCreditLineAsPercentageOfDebt

tnk:FinanceLeaseObligations


Period End2020-06-30
Value0.05
Percentage of DebtCovenantMinimumFreeLiquidityAndUndrawnRevolvingCreditLineAsPercentageOfDebt100.0

us-gaap:DebtInstrument

tnk:A2020DebtFacilityMaturinginDecember2024


Period End2020-06-30
Value0.05
Percentage of DebtCovenantMinimumFreeLiquidityAndUndrawnRevolvingCreditLineAsPercentageOfDebt100.0
tnk:TermLoanDue2023


Period End2020-06-30
Value0.05
Percentage of DebtCovenantMinimumFreeLiquidityAndUndrawnRevolvingCreditLineAsPercentageOfDebt100.0

us-gaap:DebtInstrument

tnk:DebtInstrumentCollateralNumberofVessels

tnk:A2020DebtFacilityMaturinginDecember2024


Period End2020-06-30
Value31.0
Percentage of DebtInstrumentCollateralNumberofVessels100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType, us-gaap:SubsequentEventType

tnk:TermLoanDue2023, us-gaap:SecuredDebt, us-gaap:SubsequentEvent


Period End2020-08-01
Value4.0
Percentage of DebtInstrumentCollateralNumberofVessels0.0

us-gaap:LongtermDebtType

us-gaap:SecuredDebt


Period End2020-06-30
Value4.0
Percentage of DebtInstrumentCollateralNumberofVessels12.9

us-gaap:AccruedFeesAndOtherRevenueReceivable



Period End2020-06-302019-12-312018-12-31
Value42153000.0106872000.017943000.0
Percentage of AccruedFeesAndOtherRevenueReceivable100.0100.0100.0

us-gaap:AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentExcludingCapitalLeasedAssets



Period End2020-06-302019-12-312018-12-31
Value563800000.0537100000.0494400000.0
Percentage of AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentExcludingCapitalLeasedAssets100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:AdvancesToAffiliate

us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value6430000.09930000.09930000.09930000.09930000.0
Percentage of AdvancesToAffiliate100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:AssetsHeldForSaleLongLivedFairValueDisclosure

us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312018-12-31
Value0.037240000.00.0
Percentage of AssetsHeldForSaleLongLivedFairValueDisclosure0.0100.00.0
us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312018-12-31
Value0.037240000.00.0
Percentage of AssetsHeldForSaleLongLivedFairValueDisclosure0.0100.00.0

us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent



Period End2020-06-302019-12-312018-12-31
Value0.065458000.00.0
Percentage of AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent0.0100.00.0

us-gaap:DebtInstrumentCarryingAmount



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312014-12-31
Value321681000.0562861000.0612877000.0597925000.0741992000.0814709000.0942974000.0963247000.0652233000.0828856000.0941661000.0976155000.01054708000.01166301000.0710328000.0
Percentage of DebtInstrumentCarryingAmount100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DebtInstrument, us-gaap:LongtermDebtType

tnk:A2020DebtFacilityMaturinginDecember2024, us-gaap:RevolvingCreditFacility


Period End2020-06-30
Value235000000.0
Percentage of DebtInstrumentCarryingAmount73.1

us-gaap:LongtermDebtType

us-gaap:RevolvingCreditFacility


Period End2020-06-302019-12-31
Value235000000.0341132000.0
Percentage of DebtInstrumentCarryingAmount73.160.6
us-gaap:SecuredDebt


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312014-12-31
Value86681000.0221729000.0248947000.0273996000.0323995000.0348946000.0373800000.0423500000.0330900000.0417930000.0475466000.0509368000.0543200000.0635330000.0147470000.0
Percentage of DebtInstrumentCarryingAmount26.939.440.645.843.742.839.644.050.750.450.552.251.554.520.8

us-gaap:ShortTermDebtType

us-gaap:DebtInstrumentInterestRateEffectivePercentage

us-gaap:ShortTermDebt


Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value0.0370.050.0550.0590.0
Percentage of DebtInstrumentInterestRateEffectivePercentage100.0100.0100.0100.00.0

us-gaap:DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-31
Value8743000.03182000.03917000.04699000.06586000.07631000.09157000.010945000.06328000.07070000.08645000.0
Percentage of DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeAssetsCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-31
Value0.0577000.01878000.01229000.02905000.03075000.02728000.01016000.0233000.0116000.0875000.01554000.01345000.00.0
Percentage of DerivativeAssetsCurrent0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.00.0

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis

tnk:FreightForwardAgreements, us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312018-12-312018-09-302018-06-30
Value0.00.00.0102000.034000.0
Percentage of DerivativeAssetsCurrent0.00.00.03.31.2
us-gaap:InterestRateSwap, us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312018-12-312018-09-302018-06-302017-12-31
Value0.0577000.02905000.02973000.02694000.01016000.0
Percentage of DerivativeAssetsCurrent0.0100.0100.096.798.8100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312018-12-312018-09-302018-06-302017-12-312016-12-31
Value0.0577000.02905000.03075000.02728000.01016000.0875000.0
Percentage of DerivativeAssetsCurrent0.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis

us-gaap:DerivativeAssetsNoncurrent

us-gaap:InterestRateSwap, us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312018-12-312017-12-312016-12-31
Value0.082000.02973000.04226000.04251000.0
Percentage of DerivativeAssetsNoncurrent0.0100.0100.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312018-12-312017-12-312016-12-312015-12-31
Value0.082000.02973000.04226000.04538000.05164000.0
Percentage of DerivativeAssetsNoncurrent0.0100.0100.0100.0106.80.0

us-gaap:DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-30
Value0.082000.082000.0240000.02973000.05531000.05797000.04226000.03022000.02920000.04538000.0717000.0916000.05164000.05526000.04657000.04026000.0
Percentage of DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue0.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeLiabilitiesCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-31
Value414000.086000.00.00.057000.016000.00.081000.0265000.01108000.01861000.03248000.06330000.07141000.07263000.07482000.07344000.0
Percentage of DerivativeLiabilitiesCurrent100.0100.00.00.0100.0100.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis

tnk:FreightForwardAgreements, us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312018-12-312018-06-30
Value-165000.086000.057000.016000.0
Percentage of DerivativeLiabilitiesCurrent-39.9100.0100.0100.0
us-gaap:InterestRateSwap, us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312018-12-312017-12-312016-12-312015-12-31
Value-249000.00.00.00.01108000.06330000.0
Percentage of DerivativeLiabilitiesCurrent-60.10.00.00.0100.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312018-12-312018-06-302017-12-312016-12-312015-12-31
Value414000.086000.057000.016000.00.01108000.06330000.0
Percentage of DerivativeLiabilitiesCurrent100.0100.0100.0100.00.0100.0100.0

us-gaap:DerivativeLiabilitiesNoncurrent



Period End2020-06-302019-12-312019-09-302018-12-312016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value789000.00.049000.00.00.02763000.05177000.04208000.08100000.010962000.015418000.017924000.019540000.026431000.020151000.014339000.0
Percentage of DerivativeLiabilitiesNoncurrent100.00.0100.00.00.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByMeasurementBasis

us-gaap:InterestRateSwap, us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312015-12-31
Value789000.00.04208000.0
Percentage of DerivativeLiabilitiesNoncurrent100.00.0100.0

us-gaap:FairValueByMeasurementBasis

us-gaap:CarryingReportedAmountFairValueDisclosure


Period End2020-06-302019-12-312015-12-31
Value789000.00.04208000.0
Percentage of DerivativeLiabilitiesNoncurrent100.00.0100.0

us-gaap:DueFromAffiliateCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value2440000.0697000.01634000.01240000.039663000.050551000.050034000.049103000.033314000.046306000.041420000.052501000.080075000.067159000.047493000.042502000.033197000.027991000.020981000.024787000.012610000.012357000.0
Percentage of DueFromAffiliateCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DueToAffiliateCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-312010-12-31
Value2091000.02139000.01241000.012320000.018570000.018391000.039422000.019717000.014293000.031993000.020912000.026470000.015409000.026630000.011830000.010395000.08707000.011323000.022375000.03592000.04999000.05841000.0
Percentage of DueToAffiliateCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RelatedPartyTransaction

tnk:PayabletoManager


Period End2020-06-302019-12-312019-09-302018-12-31
Value10100000.07900000.07800000.07600000.0
Percentage of DueToAffiliateCurrent483.0369.3628.540.9

us-gaap:FinanceLeaseLiability



Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value402519000.0414788000.0420934000.0426936000.0375289000.0
Percentage of FinanceLeaseLiability100.0100.0100.0100.0100.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value402519000.0414788000.0420934000.0426936000.0375289000.0
Percentage of FinanceLeaseLiability100.0100.0100.0100.0100.0
us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value465028000.0442648000.0451145000.0451746000.0377652000.0
Percentage of FinanceLeaseLiability115.5106.7107.2105.8100.6

us-gaap:FinanceLeaseLiabilityCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value26281000.025357000.024875000.024397000.020896000.0
Percentage of FinanceLeaseLiabilityCurrent100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseLiabilityNoncurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value376238000.0389431000.0396059000.0402539000.0354393000.0
Percentage of FinanceLeaseLiabilityNoncurrent100.0100.0100.0100.0100.0

tnk:LeaseObligationType

us-gaap:FinanceLeaseLiabilityPaymentsDue

tnk:FinanceLeaseObligations


Period End2020-06-302019-12-31
Value573900000.0601700000.0
Percentage of FinanceLeaseLiabilityPaymentsDue100.0100.0

tnk:LeaseObligationType

us-gaap:FinanceLeaseLiabilityUndiscountedExcessAmount

tnk:FinanceLeaseObligations


Period End2020-06-302019-12-31
Value171400000.0186900000.0
Percentage of FinanceLeaseLiabilityUndiscountedExcessAmount100.0100.0

us-gaap:FinanceLeaseRightOfUseAsset



Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value511879000.0527081000.0525597000.0529286000.0482010000.0
Percentage of FinanceLeaseRightOfUseAsset100.0100.0100.0100.0100.0

us-gaap:FinanceLeaseWeightedAverageDiscountRatePercent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value0.0760.07640.0770.0770.075
Percentage of FinanceLeaseWeightedAverageDiscountRatePercent100.0100.0100.0100.0100.0

us-gaap:FiniteLivedIntangibleAssetsAccumulatedAmortization



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-31
Value3400000.013100000.012500000.012000000.010900000.010200000.09500000.08200000.07200000.06500000.04800000.0
Percentage of FiniteLivedIntangibleAssetsAccumulatedAmortization100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue

us-gaap:InterestRateSwap, us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302017-12-312017-09-302017-06-302016-12-31
Value1038000.0659000.0866000.01408000.05878000.08504000.05242000.03145000.02744000.03143000.0
Percentage of InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0
us-gaap:InterestRateSwap, us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312018-12-312018-09-302017-12-312017-09-302017-06-302016-12-31
Value1038000.0659000.05878000.08504000.05242000.03145000.02744000.03143000.0
Percentage of InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:DerivativeInstrumentRisk, us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue

tnk:FreightForwardAgreements, us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312018-12-31
Value165000.086000.057000.0
Percentage of InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue100.0100.0100.0
tnk:FreightForwardAgreements, us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312018-12-31
Value165000.086000.057000.0
Percentage of InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue100.0100.0100.0

us-gaap:LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent



Period End2020-06-302019-12-312018-12-31
Value0.02980000.00.0
Percentage of LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent0.0100.00.0

us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityMaximumBorrowingCapacity

us-gaap:RevolvingCreditFacility


Period End2020-06-302019-12-31
Value485600000.0371500000.0
Percentage of LineOfCreditFacilityMaximumBorrowingCapacity100.0100.0

us-gaap:LongtermDebtType

us-gaap:LineOfCreditFacilityRemainingBorrowingCapacity

us-gaap:RevolvingCreditFacility


Period End2020-06-302019-12-31
Value250600000.030400000.0
Percentage of LineOfCreditFacilityRemainingBorrowingCapacity100.0100.0

us-gaap:LongtermDebtWeightedAverageInterestRate



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312013-06-302012-12-312011-12-31
Value0.030.0370.0420.0440.0460.0430.0440.0350.030.0290.0240.0240.0230.0160.0140.0110.01120.0110.0120.0120.022
Percentage of LongtermDebtWeightedAverageInterestRate100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PrepaidExpenseCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-312016-09-302016-06-302015-12-312015-06-302014-12-312014-06-302013-12-312012-12-31
Value12103000.010288000.014108000.010146000.034096000.022662000.021523000.018690000.015832000.016664000.015684000.020053000.022736000.024320000.013656000.08883000.012036000.010361000.09714000.0
Percentage of PrepaidExpenseCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssets



Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value1161097000.01223085000.01310541000.01327480000.01401551000.0
Percentage of PropertyPlantAndEquipmentNetExcludingCapitalLeasedAssets100.0100.0100.0100.0100.0

us-gaap:LongLivedAssetsHeldForSaleByAssetType

us-gaap:RestrictedCashAndCashEquivalents

tnk:RestrictedCash


Period End2020-06-302019-12-312019-06-302018-12-31
Value0.0337000.00.00.0
Percentage of RestrictedCashAndCashEquivalents0.0100.00.00.0

us-gaap:RestrictedCashCurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-31
Value4766000.03071000.02341000.01916000.02153000.01794000.01858000.01599000.01645000.01380000.0750000.0
Percentage of RestrictedCashCurrent100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0100.0

us-gaap:RestrictedCashNoncurrent



Period End2020-06-302019-12-312019-09-302019-06-302018-12-312018-09-302018-06-302017-12-312017-09-302017-06-302016-12-31
Value3437000.03437000.03437000.03437000.03437000.02672000.02672000.02672000.02672000.00.00.0
Percentage of RestrictedCashNoncurrent100.0100.0100.0100.0100.0100.0100.0100.0100.00.00.0

us-gaap:SaleLeasebackTransactionAccumulatedDepreciation



Period End2020-06-302019-12-312018-12-31
Value159000000.0143700000.0111300000.0
Percentage of SaleLeasebackTransactionAccumulatedDepreciation100.0100.0100.0

us-gaap:ShortTermBorrowings



Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value10000000.050000000.050000000.015000000.00.0
Percentage of ShortTermBorrowings100.0100.0100.0100.00.0

us-gaap:FairValueByFairValueHierarchyLevel, us-gaap:FairValueByMeasurementBasis, us-gaap:FairValueByMeasurementFrequency

us-gaap:FairValueInputsLevel2, us-gaap:CarryingReportedAmountFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312019-09-302019-06-302018-12-31
Value10000000.050000000.050000000.015000000.00.0
Percentage of ShortTermBorrowings100.0100.0100.0100.00.0
us-gaap:FairValueInputsLevel2, us-gaap:EstimateOfFairValueFairValueDisclosure, us-gaap:FairValueMeasurementsRecurring


Period End2020-06-302019-12-312018-12-31
Value9991000.050000000.00.0
Percentage of ShortTermBorrowings99.9100.00.0

Line plots across dimensions of each concept


us-gaap:CommonStockSharesIssued
us-gaap:StatementClassOfStock
(None,)

us-gaap:CommonStockSharesOutstanding
us-gaap:StatementClassOfStock
(None,)

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax
us-gaap:ProductOrService
(None,)

us-gaap:OperatingCostsAndExpenses
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

us-gaap:GeneralAndAdministrativeExpense
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

us-gaap:OperatingIncomeLoss
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

Operating Margin
us-gaap:ConsolidationItems, us-gaap:StatementBusinessSegments
('us-gaap:OperatingSegments', None)

us-gaap:Assets
us-gaap:StatementBusinessSegments
(None,)

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
(None, 'us-gaap:CommonStockIncludingAdditionalPaidInCapital')

us-gaap:StockholdersEquity
us-gaap:StatementClassOfStock, us-gaap:StatementEquityComponents
(None, 'us-gaap:CommonStockIncludingAdditionalPaidInCapital')