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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 142,340us-gaap_CashAndCashEquivalentsAtCarryingValue $ 458,956us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable—oil and gas 103,858us-gaap_AccountsReceivableNetCurrent 58,824us-gaap_AccountsReceivableNetCurrent
Accounts receivable—related parties 46us-gaap_DueFromRelatedPartiesCurrent 2,617us-gaap_DueFromRelatedPartiesCurrent
Prepaid expenses and other current assets 3,714us-gaap_PrepaidExpenseAndOtherAssetsCurrent 2,581us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Deferred tax asset 0us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 6,927us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Short-term derivative instruments 78,391us-gaap_DerivativeAssetsCurrent 324us-gaap_DerivativeAssetsCurrent
Note receivable - related party 0us-gaap_NotesReceivableRelatedPartiesCurrent 875us-gaap_NotesReceivableRelatedPartiesCurrent
Total current assets 328,349us-gaap_AssetsCurrent 531,104us-gaap_AssetsCurrent
Property and equipment:    
Oil and natural gas properties, full-cost accounting, $1,465,538 and $1,020,835 excluded from amortization in 2014 and 2013, respectively 3,923,154us-gaap_OilAndGasPropertyFullCostMethodGross 2,477,178us-gaap_OilAndGasPropertyFullCostMethodGross
Other property and equipment 18,344us-gaap_PropertyPlantAndEquipmentOther 11,131us-gaap_PropertyPlantAndEquipmentOther
Accumulated depletion, depreciation, amortization and impairment (1,050,879)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (784,717)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 2,890,619us-gaap_PropertyPlantAndEquipmentNet 1,703,592us-gaap_PropertyPlantAndEquipmentNet
Other assets:    
Equity investments ($0 and $178,708 attributable to fair value option in 2014 and 2013, respectively) 369,581us-gaap_EquityMethodInvestments 440,068us-gaap_EquityMethodInvestments
Derivative instruments 24,448us-gaap_DerivativeInstrumentsAndHedgesNoncurrent 521us-gaap_DerivativeInstrumentsAndHedgesNoncurrent
Other assets 19,396us-gaap_OtherAssetsNoncurrent 17,851us-gaap_OtherAssetsNoncurrent
Total other assets 413,425gpor_TotalOtherAssets 458,440gpor_TotalOtherAssets
Total assets 3,632,393us-gaap_Assets 2,693,136us-gaap_Assets
Current liabilities:    
Accounts payable and accrued liabilities 371,410us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent 190,707us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Asset retirement obligation—current 75us-gaap_AssetRetirementObligationCurrent 795us-gaap_AssetRetirementObligationCurrent
Short-term derivative instruments 0us-gaap_DerivativeLiabilitiesCurrent 12,280us-gaap_DerivativeLiabilitiesCurrent
Deferred tax liability 27,070us-gaap_DeferredTaxLiabilitiesCurrent 0us-gaap_DeferredTaxLiabilitiesCurrent
Current maturities of long-term debt 168us-gaap_LongTermDebtCurrent 159us-gaap_LongTermDebtCurrent
Total current liabilities 398,723us-gaap_LiabilitiesCurrent 203,941us-gaap_LiabilitiesCurrent
Long-term derivative instrument 0us-gaap_DerivativeLiabilitiesNoncurrent 11,366us-gaap_DerivativeLiabilitiesNoncurrent
Asset retirement obligation—long-term 17,863us-gaap_AssetRetirementObligationsNoncurrent 14,288us-gaap_AssetRetirementObligationsNoncurrent
Deferred tax liability 203,195us-gaap_DeferredTaxLiabilitiesGrossNoncurrent 114,275us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Long-term debt, net of current maturities 716,316us-gaap_LongTermDebtNoncurrent 299,028us-gaap_LongTermDebtNoncurrent
Total liabilities 1,336,097us-gaap_Liabilities 642,898us-gaap_Liabilities
Commitments and contingencies (Notes 16 and 17)      
Preferred stock, $.01 par value; 5,000,000 authorized, 30,000 authorized as redeemable 12% cumulative preferred stock, Series A; 0 issued and outstanding 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Stockholders’ equity:    
Common stock - $.01 par value, 200,000,000 authorized, 85,655,438 issued and outstanding in 2014 and 85,177,532 in 2013 856us-gaap_CommonStockValue 851us-gaap_CommonStockValue
Paid-in capital 1,828,602us-gaap_AdditionalPaidInCapital 1,813,058us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive loss (26,675)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (9,781)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings 493,513us-gaap_RetainedEarningsAccumulatedDeficit 246,110us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity 2,296,296us-gaap_StockholdersEquity 2,050,238us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity $ 3,632,393us-gaap_LiabilitiesAndStockholdersEquity $ 2,693,136us-gaap_LiabilitiesAndStockholdersEquity