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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating revenues: |  |  |  |  |  |
Oil, gas, and NGL production revenue | $ 2,481,544 us-gaap_OilAndGasSalesRevenue |  | $ 2,199,550 us-gaap_OilAndGasSalesRevenue |  | $ 1,473,868 us-gaap_OilAndGasSalesRevenue |
Gain (loss) on divestiture activity | 646 us-gaap_GainLossOnSaleOfProvedProperty |  | 27,974 us-gaap_GainLossOnSaleOfProvedProperty |  | (27,018)us-gaap_GainLossOnSaleOfProvedProperty |
Marketed gas system revenue | 24,897 us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue |  | 60,039 us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue |  | 52,808 us-gaap_GasGatheringTransportationMarketingAndProcessingRevenue |
Other operating revenues | 15,220 us-gaap_OtherOperatingIncome |  | 5,811 us-gaap_OtherOperatingIncome |  | 5,444 us-gaap_OtherOperatingIncome |
Total operating revenues and other income | 2,522,307 us-gaap_Revenues |  | 2,293,374 us-gaap_Revenues |  | 1,505,102 us-gaap_Revenues |
Operating Expenses |  |  |  |  |  |
Oil, gas, and NGL production expense | 715,878 us-gaap_OilAndGasProductionExpense |  | 597,045 us-gaap_OilAndGasProductionExpense |  | 391,872 us-gaap_OilAndGasProductionExpense |
Depletion, depreciation, amortization, and asset retirement obligation liability accretion | 767,532 us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion |  | 822,872 us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion |  | 727,877 us-gaap_ResultsOfOperationsDepreciationDepletionAmortizationAndAccretion |
Exploration | 129,857 us-gaap_ExplorationExpense |  | 74,104 us-gaap_ExplorationExpense |  | 90,248 us-gaap_ExplorationExpense |
Impairment of proved properties | 84,480 us-gaap_ImpairmentOfOilAndGasProperties |  | 172,641 us-gaap_ImpairmentOfOilAndGasProperties |  | 208,923 us-gaap_ImpairmentOfOilAndGasProperties |
Abandonment and impairment of unproved properties | 75,638 us-gaap_ImpairmentOfLeasehold |  | 46,105 us-gaap_ImpairmentOfLeasehold |  | 16,342 us-gaap_ImpairmentOfLeasehold |
General and administrative | 167,103 us-gaap_GeneralAndAdministrativeExpense |  | 149,551 us-gaap_GeneralAndAdministrativeExpense |  | 119,815 us-gaap_GeneralAndAdministrativeExpense |
Change in Net Profits Plan liability | (29,849)us-gaap_OtherLaborRelatedExpenses |  | (21,842)us-gaap_OtherLaborRelatedExpenses |  | (28,904)us-gaap_OtherLaborRelatedExpenses |
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net | 583,264 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | [1] | 3,080 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | [1] | 55,630 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet | [1]
Marketed gas system expense | 24,460 us-gaap_GasGatheringTransportationMarketingAndProcessingCosts |  | 57,647 us-gaap_GasGatheringTransportationMarketingAndProcessingCosts |  | 47,583 us-gaap_GasGatheringTransportationMarketingAndProcessingCosts |
Other operating expenses | 4,658 us-gaap_OtherCostAndExpenseOperating |  | 30,076 us-gaap_OtherCostAndExpenseOperating |  | 6,993 us-gaap_OtherCostAndExpenseOperating |
Total operating expenses | 1,356,493 us-gaap_CostsAndExpenses |  | 1,925,119 us-gaap_CostsAndExpenses |  | 1,525,119 us-gaap_CostsAndExpenses |
Income (loss) from operations | 1,165,814 us-gaap_OperatingIncomeLoss |  | 368,255 us-gaap_OperatingIncomeLoss |  | (20,017)us-gaap_OperatingIncomeLoss |
Nonoperating income (expense): |  |  |  |  |  |
Other, net | (2,561)us-gaap_OtherNonoperatingIncomeExpense |  | 67 us-gaap_OtherNonoperatingIncomeExpense |  | 220 us-gaap_OtherNonoperatingIncomeExpense |
Interest expense | (98,554)us-gaap_InterestExpense |  | (89,711)us-gaap_InterestExpense |  | (63,720)us-gaap_InterestExpense |
Income (loss) before income taxes | 1,064,699 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 278,611 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | (83,517)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |
Income tax (expense) benefit | (398,648)us-gaap_IncomeTaxExpenseBenefit |  | (107,676)us-gaap_IncomeTaxExpenseBenefit |  | 29,268 us-gaap_IncomeTaxExpenseBenefit |
Net income (loss) | $ 666,051 us-gaap_ProfitLoss |  | $ 170,935 us-gaap_ProfitLoss |  | $ (54,249)us-gaap_ProfitLoss |
Basic weighted-average common shares outstanding | 67,230 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 66,615 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 65,138 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Diluted weighted-average common shares outstanding | 68,044 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 67,998 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 65,138 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |
Basic net income (loss) per common share | $ 9.91 us-gaap_EarningsPerShareBasic |  | $ 2.57 us-gaap_EarningsPerShareBasic |  | $ (0.83)us-gaap_EarningsPerShareBasic |
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |
Diluted net income (loss) per common share | $ 9.79 us-gaap_EarningsPerShareDiluted |  | $ 2.51 us-gaap_EarningsPerShareDiluted |  | $ (0.83)us-gaap_EarningsPerShareDiluted |
[1] | (2) Total derivative gain is reported in the derivative gain line item on the accompanying statements of cash flows within net cash provided by operating activities.

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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 25 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6474861&loc=d3e64954-109465 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(a)(15)) -URI http://asc.fasb.org/extlink&oid=27015464&loc=d3e511914-122862 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 10 -Paragraph a -Subparagraph 15 -Article 4 + Details
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