Condensed Consolidating Financial Information - Condensed Consolidating Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified
|
Dec. 31, 2014
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
$ 142,340us-gaap_CashAndCashEquivalentsAtCarryingValue
|
$ 458,956us-gaap_CashAndCashEquivalentsAtCarryingValue
|
$ 167,088us-gaap_CashAndCashEquivalentsAtCarryingValue
|
$ 93,897us-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
|
|
|
Accounts receivable - intercompany |
|
0us-gaap_DueFromAffiliateCurrent
|
|
|
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 |
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 |
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
|
|
|
Accounts payable - intercompany |
0us-gaap_DueToAffiliateCurrent
|
0us-gaap_DueToAffiliateCurrent
|
|
|
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
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
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 (accumulated deficit) |
493,513us-gaap_RetainedEarningsAccumulatedDeficit
|
246,110us-gaap_RetainedEarningsAccumulatedDeficit
|
|
|
Total stockholders’ equity |
2,296,296us-gaap_StockholdersEquity
|
2,050,238us-gaap_StockholdersEquity
|
1,126,408us-gaap_StockholdersEquity
|
632,350us-gaap_StockholdersEquity
|
Total liabilities and stockholders’ equity |
3,632,393us-gaap_LiabilitiesAndStockholdersEquity
|
2,693,136us-gaap_LiabilitiesAndStockholdersEquity
|
|
|
Parent [Member] |
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
141,535us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
451,431us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
165,293us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
93,124us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
Accounts receivable—oil and gas |
103,762us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
58,662us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Accounts receivable-related parties |
46us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
2,617us-gaap_DueFromRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Accounts receivable - intercompany |
45,222us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
21,379us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Prepaid expenses and other current assets |
3,714us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
2,581us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Deferred tax asset |
|
6,927us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Short-term derivative instruments |
78,391us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
324us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Note receivable - related party |
|
875us-gaap_NotesReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total current assets |
372,670us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
544,796us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties |
3,887,874us-gaap_OilAndGasPropertyFullCostMethodGross / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
2,470,411us-gaap_OilAndGasPropertyFullCostMethodGross / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Other property and equipment |
18,301us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
11,102us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Accumulated depletion, depreciation, amortization and impairment |
(1,050,855)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
(784,695)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Property and equipment, net |
2,855,320us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
1,696,818us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Other assets: |
|
|
|
|
Equity investments |
360,238us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
432,727us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Derivative instruments |
24,448us-gaap_DerivativeInstrumentsAndHedgesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
521us-gaap_DerivativeInstrumentsAndHedgesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Other assets |
19,396us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
17,851us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total other assets |
404,082gpor_TotalOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
451,099gpor_TotalOtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total assets |
3,632,072us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
2,692,713us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
371,089us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
190,284us-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
|
795us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Short-term derivative instruments |
|
12,280us-gaap_DerivativeLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Deferred tax liability |
27,070us-gaap_DeferredTaxLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
|
Current maturities of long-term debt |
168us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
159us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total current liabilities |
398,402us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
203,518us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Long-term derivative instrument |
|
11,366us-gaap_DerivativeLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Asset retirement obligation—long-term |
17,863us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
14,288us-gaap_AssetRetirementObligationsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Deferred tax liability |
203,195us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
114,275us-gaap_DeferredTaxLiabilitiesGrossNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Long-term debt, net of current maturities |
716,316us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
299,028us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total liabilities |
1,335,776us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
642,475us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
856us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
851us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Paid-in capital |
1,828,602us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
1,813,058us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Accumulated other comprehensive loss |
(26,675)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
(9,781)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Retained earnings (accumulated deficit) |
493,513us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
246,110us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total stockholders’ equity |
2,296,296us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
2,050,238us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Total liabilities and stockholders’ equity |
3,632,072us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
2,692,713us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
|
|
|
Guarantor [Member] |
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
804us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
7,525us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
1,795us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
772us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
Accounts receivable—oil and gas |
96us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
162us-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 |
27us-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
|
|
|
Deferred tax asset |
|
0us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Short-term derivative instruments |
|
0us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Note receivable - related party |
|
0us-gaap_NotesReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Total current assets |
927us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
7,714us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Property and equipment: |
|
|
|
|
Oil and natural gas properties |
35,990us-gaap_OilAndGasPropertyFullCostMethodGross / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
7,340us-gaap_OilAndGasPropertyFullCostMethodGross / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Other property and equipment |
43us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
29us-gaap_PropertyPlantAndEquipmentOther / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Accumulated depletion, depreciation, amortization and impairment |
(24)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
(22)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Property and equipment, net |
36,009us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
7,347us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Other assets: |
|
|
|
|
Equity investments |
|
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 |
36,936us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
15,061us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Current liabilities: |
|
|
|
|
Accounts payable and accrued liabilities |
321us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
423us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Accounts payable - intercompany |
45,143us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
21,296us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Asset retirement obligation—current |
|
0us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Short-term derivative instruments |
|
0us-gaap_DerivativeLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Current maturities of long-term debt |
|
0us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Total current liabilities |
45,464us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
21,719us-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 |
45,464us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
21,719us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
|
0us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Paid-in capital |
322us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
322us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Accumulated other comprehensive loss |
|
0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Retained earnings (accumulated deficit) |
(8,850)us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
(6,980)us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Total stockholders’ equity |
(8,528)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
(6,658)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Total liabilities and stockholders’ equity |
36,936us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
15,061us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
|
|
|
Non-Guarantor [Member] |
|
|
|
|
Current assets: |
|
|
|
|
Cash and cash equivalents |
1us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
0us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
0us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
1us-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
|
|
|
Deferred tax asset |
|
0us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / 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
|
|
|
Note receivable - related party |
|
0us-gaap_NotesReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Total current assets |
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 |
180,217us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
191,473us-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 |
180,217gpor_TotalOtherAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
191,473gpor_TotalOtherAssets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Total assets |
180,218us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
191,473us-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 |
106us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
110us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Asset retirement obligation—current |
|
0us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Short-term derivative instruments |
|
0us-gaap_DerivativeLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Current maturities of long-term debt |
|
0us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Total current liabilities |
106us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
110us-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 |
106us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
110us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
|
0us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Paid-in capital |
227,079us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
208,277us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Accumulated other comprehensive loss |
(26,675)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
(9,781)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Retained earnings (accumulated deficit) |
(20,292)us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
(7,133)us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Total stockholders’ equity |
180,112us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
191,363us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
|
|
Total liabilities and stockholders’ equity |
180,218us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
|
191,473us-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 |
(45,249)us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(21,406)us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Prepaid expenses and other current assets |
|
0us-gaap_PrepaidExpenseAndOtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Deferred tax asset |
|
0us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Short-term derivative instruments |
|
0us-gaap_DerivativeAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Note receivable - related party |
|
0us-gaap_NotesReceivableRelatedPartiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Total current assets |
(45,249)us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(21,406)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
|
(573)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
|
(573)us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Other assets: |
|
|
|
|
Equity investments |
(170,874)us-gaap_EquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(184,132)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 |
(170,874)gpor_TotalOtherAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(184,132)gpor_TotalOtherAssets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Total assets |
(216,833)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(206,111)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 |
(45,249)us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(21,406)us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Asset retirement obligation—current |
|
0us-gaap_AssetRetirementObligationCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Short-term derivative instruments |
|
0us-gaap_DerivativeLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Current maturities of long-term debt |
|
0us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Total current liabilities |
(45,249)us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(21,406)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 |
(45,249)us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(21,406)us-gaap_Liabilities / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Stockholders’ equity: |
|
|
|
|
Common stock |
|
0us-gaap_CommonStockValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Paid-in capital |
(227,401)us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(208,599)us-gaap_AdditionalPaidInCapital / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Accumulated other comprehensive loss |
26,675us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
9,781us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Retained earnings (accumulated deficit) |
29,142us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
14,113us-gaap_RetainedEarningsAccumulatedDeficit / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Total stockholders’ equity |
(171,584)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
(184,705)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|
Total liabilities and stockholders’ equity |
$ (216,833)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
$ (206,111)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
|
|
|