Supplemental Information On Oil And Gas Exploration And Production Activities (Results of Operations for Producing Activities) (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Results of Operations for Oil and Gas Producing Activities [Line Items] | |||
Revenues | $ 670,762,000us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities | $ 262,225,000us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities | $ 248,601,000us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities |
Production costs | (140,664,000)us-gaap_ResultsOfOperationsProductionOrLiftingCosts | (64,666,000)us-gaap_ResultsOfOperationsProductionOrLiftingCosts | (53,708,000)us-gaap_ResultsOfOperationsProductionOrLiftingCosts |
Depletion | (263,946,000)us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions | (118,118,000)us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions | (90,230,000)us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions |
Results of operations, before income taxes | 266,152,000us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes | 79,441,000us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes | 104,663,000us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes |
Current | 0gpor_ResultsOfOperationsIncomeTaxExpenseCurrent | 0gpor_ResultsOfOperationsIncomeTaxExpenseCurrent | 730,000gpor_ResultsOfOperationsIncomeTaxExpenseCurrent |
Deferred | 96,061,000gpor_ResultsOfOperationsIncomeTaxExpenseDeferred | 49,447,000gpor_ResultsOfOperationsIncomeTaxExpenseDeferred | 25,633,000gpor_ResultsOfOperationsIncomeTaxExpenseDeferred |
Income tax expense | 96,061,000us-gaap_ResultsOfOperationsIncomeTaxExpense | 49,447,000us-gaap_ResultsOfOperationsIncomeTaxExpense | 26,363,000us-gaap_ResultsOfOperationsIncomeTaxExpense |
Results of operations from producing activities | 170,091,000us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts | 29,994,000us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts | 78,300,000us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts |
Depletion per MCF of Gas Equivalent | 3.01gpor_DepletionperMCFofGasEquivalent | 4.78gpor_DepletionperMCFofGasEquivalent | 5.85gpor_DepletionperMCFofGasEquivalent |
Diamondback Energy, Inc [Member] | |||
Results of Operations for Oil and Gas Producing Activities [Line Items] | |||
Revenues |
0us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
14,976,000us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
16,042,000us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
Production costs |
0us-gaap_ResultsOfOperationsProductionOrLiftingCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
(2,518,000)us-gaap_ResultsOfOperationsProductionOrLiftingCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
(4,474,000)us-gaap_ResultsOfOperationsProductionOrLiftingCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
Depletion |
0us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
(4,754,000)us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
(5,515,000)us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
Results of operations, before income taxes |
0us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
7,704,000us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
6,053,000us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
Income tax expense |
0us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
2,286,000us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
2,158,000us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
Results of operations from producing activities |
0us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
5,418,000us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
3,895,000us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_DiamondbackEnergyIncMember |
Grizzly Oil Sands ULC [Member] | |||
Results of Operations for Oil and Gas Producing Activities [Line Items] | |||
Revenues |
5,449,000us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
0us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
0us-gaap_ResultsOfOperationsRevenueFromOilAndGasProducingActivities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
Production costs |
(10,113,000)us-gaap_ResultsOfOperationsProductionOrLiftingCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
0us-gaap_ResultsOfOperationsProductionOrLiftingCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
0us-gaap_ResultsOfOperationsProductionOrLiftingCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
Depletion |
(1,195,000)us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
0us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
0us-gaap_ResultsOfOperationsDepreciationDepletionAndAmortizationAndValuationProvisions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
Results of operations, before income taxes |
(5,859,000)us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
0us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
0us-gaap_ResultsOfOperationsIncomeBeforeIncomeTaxes / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
Income tax expense |
0us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
0us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
0us-gaap_ResultsOfOperationsIncomeTaxExpense / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
Results of operations from producing activities |
$ (5,859,000)us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
$ 0us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
$ 0us-gaap_ResultsOfOperationsOilAndGasProducingActivitiesNetIncomeExcludingCorporateOverheadAndInterestCosts / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = gpor_GrizzlyOilSandsUlcMember |
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Depletion per MCF of Gas Equivalent No definition available.
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Results of operations income tax expense current No definition available.
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Results of operations income tax expense deferred No definition available.
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Depreciation, depletion and amortization, and valuation provisions (impairments) related to oil and gas producing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Income before income taxes for oil and gas producing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Income tax expense for oil and gas producing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The results of operations for oil and gas producing activities, excluding corporate overhead and interest costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Total revenues from oil and gas producing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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