Equity Investments (Narrative) (Details) (USD $)
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3 Months Ended |
1 Months Ended |
0 Months Ended |
1 Months Ended |
12 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 31, 2015
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Jan. 28, 2014
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Nov. 12, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Dec. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2012
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Oct. 11, 2012
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Schedule of Equity Method Investments [Line Items] |
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Payments for equity method investments |
$ 6,093,000us-gaap_PaymentsToAcquireEquityMethodInvestments
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$ 23,687,000us-gaap_PaymentsToAcquireEquityMethodInvestments
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Equity investments and investments in subsidiaries |
374,971,000us-gaap_EquityMethodInvestments
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374,971,000us-gaap_EquityMethodInvestments
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369,581,000us-gaap_EquityMethodInvestments
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(Income) loss from equity method investments |
(19,975,000)us-gaap_IncomeLossFromEquityMethodInvestments
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(128,475,000)us-gaap_IncomeLossFromEquityMethodInvestments
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Distributions received |
817,000us-gaap_EquityMethodInvestmentDividendsOrDistributions
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0us-gaap_EquityMethodInvestmentDividendsOrDistributions
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Apico Llc [Member] |
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Schedule of Equity Method Investments [Line Items] |
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Equity shares owned by affiliate (shares) |
85,122gpor_EquitySharesOwnedByAffiliateOfInvestment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_ApicoLlcMember
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Total shares owned of subaffiliate (shares) |
1,000,000gpor_EquityMethodInvestmentTotalSharesOutstandingOfSubaffiliate / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_ApicoLlcMember
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Gas and oil area, reserve (acres) |
243,000gpor_GasAndOilAreaReserve / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_ApicoLlcMember
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Tatex Thailand III, LLC [Member] |
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Schedule of Equity Method Investments [Line Items] |
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Gas and oil area, reserve (acres) |
245,000gpor_GasAndOilAreaReserve / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiiLlcMember
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Ownership interest |
17.90%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiiLlcMember
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17.90%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiiLlcMember
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Equity investments and investments in subsidiaries |
0us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiiLlcMember
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0us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiiLlcMember
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(Income) loss from equity method investments |
0us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiiLlcMember
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49,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_TatexThailandIiiLlcMember
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Grizzly Oil Sands ULC [Member] |
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Schedule of Equity Method Investments [Line Items] |
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Gas and oil area, reserve (acres) |
830,000gpor_GasAndOilAreaReserve / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember
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Cash calls paid |
6,100,000gpor_EquityMethodInvestmentAmountOfCashCallsBasedOnProportionateOwnershipInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember
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Increase (decrease) due to foreign currency translation adjustment |
15,000,000gpor_EquityMethodInvestmentsIncreaseDecreaseDueToForeignCurrencyTranslationAdjustment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember
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7,300,000gpor_EquityMethodInvestmentsIncreaseDecreaseDueToForeignCurrencyTranslationAdjustment / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember
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Ownership interest |
24.9999%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember
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24.9999%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember
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Equity investments and investments in subsidiaries |
167,186,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember
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167,186,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember
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180,218,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember
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(Income) loss from equity method investments |
4,142,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember
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2,001,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember
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Windsor Midstream LLC [Member] |
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Schedule of Equity Method Investments [Line Items] |
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Ownership interest |
22.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember
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22.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember
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Equity investments and investments in subsidiaries |
32,292,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember
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32,292,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember
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13,505,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember
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(Income) loss from equity method investments |
(18,787,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember
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(168,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember
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Windsor Midstream LLC [Member] | MidMar Gas LLC [Member] |
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Schedule of Equity Method Investments [Line Items] |
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Ownership interest |
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28.40%us-gaap_EquityMethodInvestmentOwnershipPercentage / dei_LegalEntityAxis = gpor_MidmarGasLlcMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_WindsorMidstreamLlcMember
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Coronado Midstream [Member] | Windsor Midstream LLC [Member] |
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Schedule of Equity Method Investments [Line Items] |
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Proceeds from sale of interest in partnership unit |
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600,000,000us-gaap_ProceedsFromSaleOfEquityMethodInvestments / dei_LegalEntityAxis = gpor_WindsorMidstreamLlcMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_CoronadoMidstreamMember
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Gain on sale on investment |
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85,500,000us-gaap_GainLossOnSaleOfEquityInvestments / dei_LegalEntityAxis = gpor_WindsorMidstreamLlcMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_CoronadoMidstreamMember
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Blackhawk Midstream LLC [Member] |
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Schedule of Equity Method Investments [Line Items] |
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Ownership interest |
48.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember
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48.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember
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Equity investments and investments in subsidiaries |
0us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember
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0us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember
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0us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember
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(Income) loss from equity method investments |
(7,217,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember
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(84,787,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember
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Blackhawk Midstream LLC [Member] | Ohio Gathering Company, LLC and Ohio Condensate Company, LLC [Member] |
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Schedule of Equity Method Investments [Line Items] |
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Purchase price of sold equity interests |
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190,000,000us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = gpor_OhioGatheringCompanyLLCandOhioCondensateCompanyLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember
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Amount put in escrow |
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14,300,000us-gaap_EscrowDeposit / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = gpor_OhioGatheringCompanyLLCandOhioCondensateCompanyLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember
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Proceeds from release of escrow deposits |
7,200,000us-gaap_EscrowDepositDisbursementsRelatedToPropertyAcquisition1 / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = gpor_OhioGatheringCompanyLLCandOhioCondensateCompanyLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember
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Distributions received |
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84,800,000us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = gpor_OhioGatheringCompanyLLCandOhioCondensateCompanyLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_BlackhawkMidstreamLlcMember
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Diamondback Energy, Inc [Member] |
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Schedule of Equity Method Investments [Line Items] |
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Ownership interest |
0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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0.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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Investment (shares) |
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7,914,036us-gaap_InvestmentOwnedBalanceShares / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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Equity investments and investments in subsidiaries |
0us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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0us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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0us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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138,500,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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Number of shares issued in transaction (shares) |
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942,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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1,437,500us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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1,000,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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4,534,536us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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Proceeds received from sale of stock |
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60,800,000us-gaap_SaleOfStockConsiderationReceivedOnTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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197,600,000us-gaap_SaleOfStockConsiderationReceivedOnTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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192,700,000us-gaap_SaleOfStockConsiderationReceivedOnTransaction / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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(Income) loss from equity method investments |
0us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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(48,767,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember
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Sturgeon Acquisitions LLC [Member] |
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Schedule of Equity Method Investments [Line Items] |
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Payments for equity method investments |
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20,700,000us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember
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Ownership interest |
25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember
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25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember
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25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember
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Equity investments and investments in subsidiaries |
22,258,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember
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22,258,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember
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22,507,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember
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(Income) loss from equity method investments |
(568,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember
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0us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember
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Distributions received |
800,000us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_SturgeonAcquisitionsLLCMember
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Mammoth Energy Partners LP [Member] |
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Schedule of Equity Method Investments [Line Items] |
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Ownership interest |
30.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember
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30.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember
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30.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember
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Equity investments and investments in subsidiaries |
143,807,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember
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143,807,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember
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143,973,000us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember
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(Income) loss from equity method investments |
2,372,000us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember
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0us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember
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Equity investment in Mammoth Energy Partners |
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$ 143,500,000us-gaap_EquityMethodInvestmentsFairValueDisclosure / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_MammothEnergyPartnersLPMember
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