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v2.4.1.9

Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Current assets: |  |
Cash and cash equivalents | $ 74,740 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 142,340 us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable—oil and gas | 79,680 us-gaap_AccountsReceivableNetCurrent | 103,858 us-gaap_AccountsReceivableNetCurrent
Accounts receivable—related parties | 33 us-gaap_DueFromRelatedPartiesCurrent | 46 us-gaap_DueFromRelatedPartiesCurrent
Prepaid expenses and other current assets | 15,777 us-gaap_PrepaidExpenseAndOtherAssetsCurrent | 3,714 us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Short-term derivative instruments | 93,030 us-gaap_DerivativeAssetsCurrent | 78,391 us-gaap_DerivativeAssetsCurrent
Total current assets | 263,260 us-gaap_AssetsCurrent | 328,349 us-gaap_AssetsCurrent
Property and equipment: |  |
Oil and natural gas properties, full-cost accounting, $1,546,804 and $1,465,538 excluded from amortization in 2015 and 2014, respectively | 4,177,962 us-gaap_OilAndGasPropertyFullCostMethodGross | 3,923,154 us-gaap_OilAndGasPropertyFullCostMethodGross
Other property and equipment | 19,051 us-gaap_PropertyPlantAndEquipmentOther | 18,344 us-gaap_PropertyPlantAndEquipmentOther
Accumulated depletion, depreciation, amortization and impairment | (1,140,168)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (1,050,879)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net | 3,056,845 us-gaap_PropertyPlantAndEquipmentNet | 2,890,619 us-gaap_PropertyPlantAndEquipmentNet
Other assets: |  |
Equity investments | 374,971 us-gaap_EquityMethodInvestments | 369,581 us-gaap_EquityMethodInvestments
Derivative instruments | 41,956 us-gaap_DerivativeInstrumentsAndHedgesNoncurrent | 24,448 us-gaap_DerivativeInstrumentsAndHedgesNoncurrent
Other assets | 18,566 us-gaap_OtherAssetsNoncurrent | 19,396 us-gaap_OtherAssetsNoncurrent
Total other assets | 435,493 gpor_TotalOtherAssets | 413,425 gpor_TotalOtherAssets
Total assets | 3,755,598 us-gaap_Assets | 3,632,393 us-gaap_Assets
Current liabilities: |  |
Accounts payable and accrued liabilities | 400,096 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent | 371,410 us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Asset retirement obligation—current | 75 us-gaap_AssetRetirementObligationCurrent | 75 us-gaap_AssetRetirementObligationCurrent
Deferred tax liability | 29,622 us-gaap_DeferredTaxLiabilitiesCurrent | 27,070 us-gaap_DeferredTaxLiabilitiesCurrent
Short-term derivative instruments | 823 us-gaap_DerivativeLiabilitiesCurrent |
Current maturities of long-term debt | 1,781 us-gaap_LongTermDebtCurrent | 168 us-gaap_LongTermDebtCurrent
Total current liabilities | 432,397 us-gaap_LiabilitiesCurrent | 398,723 us-gaap_LiabilitiesCurrent
Asset retirement obligation—long-term | 18,656 us-gaap_AssetRetirementObligationsNoncurrent | 17,863 us-gaap_AssetRetirementObligationsNoncurrent
Deferred tax liability | 215,122 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent | 203,195 us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Long-term debt, net of current maturities | 779,130 us-gaap_LongTermDebtNoncurrent | 716,316 us-gaap_LongTermDebtNoncurrent
Total liabilities | 1,445,305 us-gaap_Liabilities | 1,336,097 us-gaap_Liabilities
Commitments and contingencies (Note 8) |  |
Preferred stock, $.01 par value; 5,000,000 authorized, 30,000 authorized as redeemable 12% cumulative preferred stock, Series A; 0 issued and outstanding | 0 us-gaap_PreferredStockValue | 0 us-gaap_PreferredStockValue
Stockholders’ equity: |  |
Common stock - $.01 par value, 200,000,000 authorized, 85,715,819 issued and outstanding in 2015 and 85,655,438 in 2014 | 857 us-gaap_CommonStockValue | 856 us-gaap_CommonStockValue
Paid-in capital | 1,832,063 us-gaap_AdditionalPaidInCapital | 1,828,602 us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive loss | (41,659)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (26,675)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings | 519,032 us-gaap_RetainedEarningsAccumulatedDeficit | 493,513 us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity | 2,310,293 us-gaap_StockholdersEquity | 2,296,296 us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity | $ 3,755,598 us-gaap_LiabilitiesAndStockholdersEquity | $ 3,632,393 us-gaap_LiabilitiesAndStockholdersEquity

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- Definition The aggregate amount of receivables to be collected from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth, at the financial statement date. which are usually due within one year (or one business cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(k)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph k -Subparagraph 2 -Article 4 + Details
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