Condensed Consolidating Financial Information - Condensed Consolidating Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified
|
Mar. 31, 2015
|
Dec. 31, 2014
|
Mar. 31, 2014
|
Dec. 31, 2013
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
$ 74,740us-gaap_CashAndCashEquivalentsAtCarryingValue
|
$ 142,340us-gaap_CashAndCashEquivalentsAtCarryingValue
|
$ 170,382us-gaap_CashAndCashEquivalentsAtCarryingValue
|
$ 458,956us-gaap_CashAndCashEquivalentsAtCarryingValue
|
Accounts receivable—oil and gas |
79,680us-gaap_AccountsReceivableNetCurrent
|
103,858us-gaap_AccountsReceivableNetCurrent
|
|
|
Accounts receivable - related parties |
33us-gaap_DueFromRelatedPartiesCurrent
|
46us-gaap_DueFromRelatedPartiesCurrent
|
|
|
Accounts receivable - intercompany |
|
0us-gaap_DueFromAffiliateCurrent
|
|
|
Prepaid expenses and other current assets |
15,777us-gaap_PrepaidExpenseAndOtherAssetsCurrent
|
3,714us-gaap_PrepaidExpenseAndOtherAssetsCurrent
|
|
|
Short-term derivative instruments |
93,030us-gaap_DerivativeAssetsCurrent
|
78,391us-gaap_DerivativeAssetsCurrent
|
|
|
Total current assets |
263,260us-gaap_AssetsCurrent
|
328,349us-gaap_AssetsCurrent
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties |
4,177,962us-gaap_OilAndGasPropertyFullCostMethodGross
|
3,923,154us-gaap_OilAndGasPropertyFullCostMethodGross
|
|
|
Other property and equipment |
19,051us-gaap_PropertyPlantAndEquipmentOther
|
18,344us-gaap_PropertyPlantAndEquipmentOther
|
|
|
Accumulated depletion, depreciation, amortization and impairment |
(1,140,168)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
|
(1,050,879)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
|
|
|
Property and equipment, net |
3,056,845us-gaap_PropertyPlantAndEquipmentNet
|
2,890,619us-gaap_PropertyPlantAndEquipmentNet
|
|
|
Other assets: |
|
|
|
|
Equity investments and investments in subsidiaries |
374,971us-gaap_EquityMethodInvestments
|
369,581us-gaap_EquityMethodInvestments
|
|
|
Derivative instruments |
41,956us-gaap_DerivativeInstrumentsAndHedgesNoncurrent
|
24,448us-gaap_DerivativeInstrumentsAndHedgesNoncurrent
|
|
|
Other assets |
18,566us-gaap_OtherAssetsNoncurrent
|
19,396us-gaap_OtherAssetsNoncurrent
|
|
|
Total other assets |
435,493gpor_TotalOtherAssets
|
413,425gpor_TotalOtherAssets
|
|
|
Total assets |
3,755,598us-gaap_Assets
|
3,632,393us-gaap_Assets
|
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
400,096us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
|
371,410us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
|
|
|
Accounts payable - intercompany |
0us-gaap_DueToAffiliateCurrent
|
0us-gaap_DueToAffiliateCurrent
|
|
|
Asset retirement obligation—current |
75us-gaap_AssetRetirementObligationCurrent
|
75us-gaap_AssetRetirementObligationCurrent
|
795us-gaap_AssetRetirementObligationCurrent
|
|
Short-term derivative instruments |
823us-gaap_DerivativeLiabilitiesCurrent
|
|
|
|
Deferred tax liability - current |
29,622us-gaap_DeferredTaxLiabilitiesCurrent
|
27,070us-gaap_DeferredTaxLiabilitiesCurrent
|
|
|
Current maturities of long-term debt |
1,781us-gaap_LongTermDebtCurrent
|
168us-gaap_LongTermDebtCurrent
|
|
|
Total current liabilities |
432,397us-gaap_LiabilitiesCurrent
|
398,723us-gaap_LiabilitiesCurrent
|
|
|
Long-term derivative instrument |
0us-gaap_DerivativeLiabilitiesNoncurrent
|
|
|
|
Asset retirement obligation—long-term |
18,656us-gaap_AssetRetirementObligationsNoncurrent
|
17,863us-gaap_AssetRetirementObligationsNoncurrent
|
14,650us-gaap_AssetRetirementObligationsNoncurrent
|
|
Deferred tax liability |
215,122us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
|
203,195us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
|
|
|
Long-term debt, net of current maturities |
779,130us-gaap_LongTermDebtNoncurrent
|
716,316us-gaap_LongTermDebtNoncurrent
|
|
|
Total liabilities |
1,445,305us-gaap_Liabilities
|
1,336,097us-gaap_Liabilities
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
857us-gaap_CommonStockValue
|
856us-gaap_CommonStockValue
|
|
|
Paid-in capital |
1,832,063us-gaap_AdditionalPaidInCapital
|
1,828,602us-gaap_AdditionalPaidInCapital
|
|
|
Accumulated other comprehensive income (loss) |
(41,659)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
|
(26,675)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
|
|
|
Retained earnings (accumulated deficit) |
519,032us-gaap_RetainedEarningsAccumulatedDeficit
|
493,513us-gaap_RetainedEarningsAccumulatedDeficit
|
|
|
Total stockholders’ equity |
2,310,293us-gaap_StockholdersEquity
|
2,296,296us-gaap_StockholdersEquity
|
2,130,440us-gaap_StockholdersEquity
|
2,050,238us-gaap_StockholdersEquity
|
Total liabilities and stockholders’ equity |
3,755,598us-gaap_LiabilitiesAndStockholdersEquity
|
3,632,393us-gaap_LiabilitiesAndStockholdersEquity
|
|
|
Parent [Member] |
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
73,667us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
141,535us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
168,476us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
451,431us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
Accounts receivable—oil and gas |
79,621us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
103,762us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Accounts receivable - related parties |
33us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
46us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Accounts receivable - intercompany |
48,154us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
45,222us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Prepaid expenses and other current assets |
15,777us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
3,714us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Short-term derivative instruments |
93,030us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
78,391us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total current assets |
310,282us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
372,670us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties |
4,139,903us-gaap_OilAndGasPropertyFullCostMethodGross / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
3,887,874us-gaap_OilAndGasPropertyFullCostMethodGross / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Other property and equipment |
19,008us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
18,301us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Accumulated depletion, depreciation, amortization and impairment |
(1,140,142)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
(1,050,855)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Property and equipment, net |
3,018,769us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
2,855,320us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Other assets: |
|
|
|
|
Equity investments and investments in subsidiaries |
365,840us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
360,238us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Derivative instruments |
41,956us-gaap_DerivativeInstrumentsAndHedgesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
24,448us-gaap_DerivativeInstrumentsAndHedgesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Other assets |
18,566us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
19,396us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total other assets |
426,362gpor_TotalOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
404,082gpor_TotalOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total assets |
3,755,413us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
3,632,072us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
399,912us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
371,089us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Accounts payable - intercompany |
0us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
0us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Asset retirement obligation—current |
75us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
75us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Short-term derivative instruments |
823us-gaap_DerivativeLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
|
Deferred tax liability - current |
29,622us-gaap_DeferredTaxLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
27,070us-gaap_DeferredTaxLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Current maturities of long-term debt |
1,781us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
168us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total current liabilities |
432,213us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
398,402us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Long-term derivative instrument |
0us-gaap_DerivativeLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
|
Asset retirement obligation—long-term |
18,656us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
17,863us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Deferred tax liability |
215,122us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
203,195us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Long-term debt, net of current maturities |
779,130us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
716,316us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total liabilities |
1,445,121us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
1,335,776us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
857us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
856us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Paid-in capital |
1,832,062us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
1,828,602us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Accumulated other comprehensive income (loss) |
(41,659)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
(26,675)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Retained earnings (accumulated deficit) |
519,032us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
493,513us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total stockholders’ equity |
2,310,292us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
2,296,296us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total liabilities and stockholders’ equity |
3,755,413us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
3,632,072us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Guarantors [Member] |
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
1,072us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
804us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
1,906us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
7,525us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
Accounts receivable—oil and gas |
59us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
96us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Accounts receivable - related parties |
0us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
0us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Accounts receivable - intercompany |
26us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
27us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Prepaid expenses and other current assets |
|
0us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Short-term derivative instruments |
0us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
0us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Total current assets |
1,157us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
927us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties |
38,769us-gaap_OilAndGasPropertyFullCostMethodGross / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
35,990us-gaap_OilAndGasPropertyFullCostMethodGross / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Other property and equipment |
43us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
43us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Accumulated depletion, depreciation, amortization and impairment |
(26)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
(24)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Property and equipment, net |
38,786us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
36,009us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Other assets: |
|
|
|
|
Equity investments and investments in subsidiaries |
|
0us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Derivative instruments |
0us-gaap_DerivativeInstrumentsAndHedgesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
0us-gaap_DerivativeInstrumentsAndHedgesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Other assets |
|
0us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Total assets |
39,943us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
36,936us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
184us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
321us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Accounts payable - intercompany |
48,072us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
45,143us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Asset retirement obligation—current |
|
0us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Deferred tax liability - current |
|
0us-gaap_DeferredTaxLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Current maturities of long-term debt |
|
0us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Total current liabilities |
48,256us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
45,464us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Long-term derivative instrument |
0us-gaap_DerivativeLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
|
Asset retirement obligation—long-term |
0us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
0us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Deferred tax liability |
|
0us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Long-term debt, net of current maturities |
0us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
0us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Total liabilities |
48,256us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
45,464us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
|
0us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Paid-in capital |
321us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
322us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Accumulated other comprehensive income (loss) |
|
0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Retained earnings (accumulated deficit) |
(8,634)us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
(8,850)us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Total stockholders’ equity |
(8,313)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
(8,528)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Total liabilities and stockholders’ equity |
39,943us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
36,936us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Non-Guarantor [Member] |
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
1us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
1us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
0us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
0us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
Accounts receivable—oil and gas |
0us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
0us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Accounts receivable - related parties |
0us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
0us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Accounts receivable - intercompany |
0us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
0us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Prepaid expenses and other current assets |
0us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
0us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Short-term derivative instruments |
0us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
0us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Total current assets |
1us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
1us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties |
|
0us-gaap_OilAndGasPropertyFullCostMethodGross / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Other property and equipment |
|
0us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Accumulated depletion, depreciation, amortization and impairment |
|
0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Property and equipment, net |
|
0us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Other assets: |
|
|
|
|
Equity investments and investments in subsidiaries |
167,186us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
180,217us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Derivative instruments |
0us-gaap_DerivativeInstrumentsAndHedgesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
0us-gaap_DerivativeInstrumentsAndHedgesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Other assets |
|
0us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Total other assets |
167,186gpor_TotalOtherAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
180,217gpor_TotalOtherAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Total assets |
167,187us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
180,218us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
|
0us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Accounts payable - intercompany |
108us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
106us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Asset retirement obligation—current |
|
0us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Deferred tax liability - current |
|
0us-gaap_DeferredTaxLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Current maturities of long-term debt |
|
0us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Total current liabilities |
108us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
106us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Long-term derivative instrument |
0us-gaap_DerivativeLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
|
Asset retirement obligation—long-term |
0us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
0us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Deferred tax liability |
|
0us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Long-term debt, net of current maturities |
0us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
0us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Total liabilities |
108us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
106us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
|
0us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Paid-in capital |
233,174us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
227,079us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Accumulated other comprehensive income (loss) |
(41,659)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
(26,675)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Retained earnings (accumulated deficit) |
(24,436)us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
(20,292)us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Total stockholders’ equity |
167,079us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
180,112us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Total liabilities and stockholders’ equity |
167,187us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
180,218us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Eliminations [Member] |
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
0us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
0us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
0us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
0us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
Accounts receivable—oil and gas |
|
0us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Accounts receivable - related parties |
0us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
0us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Accounts receivable - intercompany |
(48,180)us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(45,249)us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Prepaid expenses and other current assets |
|
0us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Short-term derivative instruments |
0us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
0us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Total current assets |
(48,180)us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(45,249)us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties |
(710)us-gaap_OilAndGasPropertyFullCostMethodGross / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(710)us-gaap_OilAndGasPropertyFullCostMethodGross / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Other property and equipment |
|
0us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Accumulated depletion, depreciation, amortization and impairment |
|
0us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Property and equipment, net |
(710)us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(710)us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Other assets: |
|
|
|
|
Equity investments and investments in subsidiaries |
(158,055)us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(170,874)us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Derivative instruments |
0us-gaap_DerivativeInstrumentsAndHedgesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
0us-gaap_DerivativeInstrumentsAndHedgesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Other assets |
|
0us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Total other assets |
(158,055)gpor_TotalOtherAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(170,874)gpor_TotalOtherAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Total assets |
(206,945)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(216,833)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
|
0us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Accounts payable - intercompany |
(48,180)us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(45,249)us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Asset retirement obligation—current |
|
0us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Deferred tax liability - current |
|
0us-gaap_DeferredTaxLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Current maturities of long-term debt |
|
0us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Total current liabilities |
(48,180)us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(45,249)us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Long-term derivative instrument |
0us-gaap_DerivativeLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
|
Asset retirement obligation—long-term |
0us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
0us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Deferred tax liability |
|
0us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Long-term debt, net of current maturities |
0us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
0us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Total liabilities |
(48,180)us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(45,249)us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
|
0us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Paid-in capital |
(233,494)us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(227,401)us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Accumulated other comprehensive income (loss) |
41,659us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
26,675us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Retained earnings (accumulated deficit) |
33,070us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
29,142us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Total stockholders’ equity |
(158,765)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(171,584)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Total liabilities and stockholders’ equity |
$ (206,945)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
$ (216,833)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|