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v2.4.1.9

Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Cash flows from operating activities: |  |
Net income | $ 25,519 us-gaap_NetIncomeLoss | $ 82,558 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Accretion of discount—Asset Retirement Obligation | 190 us-gaap_AssetRetirementObligationAccretionExpense | 188 us-gaap_AssetRetirementObligationAccretionExpense
Depletion, depreciation and amortization | 89,909 us-gaap_DepreciationDepletionAndAmortization | 56,877 us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation expense | 2,077 us-gaap_ShareBasedCompensation | 2,584 us-gaap_ShareBasedCompensation
Gain from equity investments | (12,759)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions | (43,688)us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
Interest income - note receivable |  | (13)gpor_InterestIncomeNoteReceivable
Unrealized (gain) loss on derivative instruments | (31,324)us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet | 8,665 us-gaap_GainLossOnCashFlowHedgeIneffectivenessNet
Deferred income tax expense | 14,479 gpor_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations | 33,564 gpor_DeferredIncomeTaxExpenseBenefitIncludingDiscontinuedOperations
Amortization of loan commitment fees | 617 us-gaap_AmortizationOfFinancingCosts | 294 us-gaap_AmortizationOfFinancingCosts
Amortization of note discount and premium | (528)us-gaap_AmortizationOfDebtDiscountPremium | 78 us-gaap_AmortizationOfDebtDiscountPremium
Changes in operating assets and liabilities: |  |
Decrease (increase) in accounts receivable | 24,178 us-gaap_IncreaseDecreaseInAccountsReceivable | (27,944)us-gaap_IncreaseDecreaseInAccountsReceivable
Decrease in accounts receivable—related party | 13 us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties | 2,047 us-gaap_IncreaseDecreaseInAccountsReceivableRelatedParties
Increase in prepaid expenses | (12,063)us-gaap_IncreaseDecreaseInPrepaidExpense | (771)us-gaap_IncreaseDecreaseInPrepaidExpense
(Decrease) increase in accounts payable and accrued liabilities | (290)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 43,406 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Settlement of asset retirement obligation | (981)gpor_IncreaseDecreaseInAssetRetirementObligation | (1,695)gpor_IncreaseDecreaseInAssetRetirementObligation
Net cash provided by operating activities | 99,037 us-gaap_NetCashProvidedByUsedInOperatingActivities | 156,150 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities: |  |
Deductions to cash held in escrow | 8 us-gaap_IncreaseDecreaseInRestrictedCash | 8 us-gaap_IncreaseDecreaseInRestrictedCash
Additions to other property and equipment | (632)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment | (1,002)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment
Additions to oil and gas properties | (226,905)us-gaap_PaymentsToAcquireOilAndGasProperty | (420,431)us-gaap_PaymentsToAcquireOilAndGasProperty
Proceeds from sale of oil and gas properties | 1,314 us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment | 0 us-gaap_ProceedsFromSaleOfOilAndGasPropertyAndEquipment
Contributions to equity method investments | (6,093)us-gaap_PaymentsToAcquireEquityMethodInvestments | (23,687)us-gaap_PaymentsToAcquireEquityMethodInvestments
Distributions from equity method investments | 817 us-gaap_EquityMethodInvestmentDividendsOrDistributions | 0 us-gaap_EquityMethodInvestmentDividendsOrDistributions
Net cash used in investing activities | (231,491)us-gaap_NetCashProvidedByUsedInInvestingActivities | (445,112)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities: |  |
Principal payments on borrowings | (50,045)us-gaap_RepaymentsOfDebt | (42)us-gaap_RepaymentsOfDebt
Borrowings on line of credit | 115,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Debt issuance costs and loan commitment fees | (101)us-gaap_PaymentsOfLoanCosts | (185)us-gaap_PaymentsOfLoanCosts
Proceeds from issuance of common stock, net of offering costs and exercise of stock options |  | 615 us-gaap_ProceedsFromIssuanceOfCommonStock
Net cash provided by financing activities | 64,854 us-gaap_NetCashProvidedByUsedInFinancingActivities | 388 us-gaap_NetCashProvidedByUsedInFinancingActivities
Net decrease in cash and cash equivalents | (67,600)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (288,574)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period | 142,340 us-gaap_CashAndCashEquivalentsAtCarryingValue | 458,956 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period | 74,740 us-gaap_CashAndCashEquivalentsAtCarryingValue | 170,382 us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information: |  |
Interest payments | 240 us-gaap_InterestPaidNet | 18 us-gaap_InterestPaidNet
Income tax payments | 29,750 us-gaap_IncomeTaxesPaid | 13,000 us-gaap_IncomeTaxesPaid
Supplemental disclosure of non-cash transactions: |  |
Capitalized stock based compensation | 1,385 gpor_CapitalizedStockBasedCompensation | 1,723 gpor_CapitalizedStockBasedCompensation
Asset retirement obligation capitalized | 1,584 us-gaap_AssetRetirementObligationLiabilitiesIncurred | 1,869 us-gaap_AssetRetirementObligationLiabilitiesIncurred
Interest capitalized | 3,694 us-gaap_InterestCostsCapitalized | 2,318 us-gaap_InterestCostsCapitalized
Foreign currency translation loss on investment in Grizzly Oil Sands ULC | $ (14,984)gpor_ForeignCurrencyTranslationGainLossOnInvestmentInEquityMethodInvestment | $ (7,278)gpor_ForeignCurrencyTranslationGainLossOnInvestmentInEquityMethodInvestment

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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 + Details
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- Definition The cash outflow for loan origination associated cost which is usually collected through escrow. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash outflow to purchase of mineral interests in oil and gas properties for use in the normal oil and gas operations and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash outflow for acquisition of or capital improvements of property, plant and equipment, used to produce goods or deliver services, and not otherwise defined in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585 + Details
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- Definition The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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