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Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified
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3 Months Ended |
12 Months Ended |
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Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Income Statement [Abstract] |
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| Revenues |
$ 196,677us-gaap_Revenues
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$ 234,521us-gaap_Revenues
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$ 262,994us-gaap_Revenues
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$ 254,516us-gaap_Revenues
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$ 244,928us-gaap_Revenues
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[1],[2] |
$ 244,555us-gaap_Revenues
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[1],[2] |
$ 235,383us-gaap_Revenues
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[1],[2] |
$ 259,222us-gaap_Revenues
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[1],[2] |
$ 948,708us-gaap_Revenues
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$ 984,088us-gaap_Revenues
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$ 874,491us-gaap_Revenues
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| Operating costs and expenses: |
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| Lease operating expenses |
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264,751us-gaap_LeaseOperatingExpense
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270,839us-gaap_LeaseOperatingExpense
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232,260us-gaap_LeaseOperatingExpense
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| Production taxes |
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7,932us-gaap_ProductionTaxExpense
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7,135us-gaap_ProductionTaxExpense
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5,840us-gaap_ProductionTaxExpense
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| Gathering and transportation |
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19,821us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
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17,510us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
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14,878us-gaap_GasGatheringTransportationMarketingAndProcessingCosts
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| Depreciation, depletion and amortization |
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490,469us-gaap_DepreciationDepletionAndAmortization
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430,611us-gaap_DepreciationDepletionAndAmortization
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336,177us-gaap_DepreciationDepletionAndAmortization
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| Asset retirement obligations accretion |
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20,633us-gaap_AssetRetirementObligationAccretionExpense
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20,918us-gaap_AssetRetirementObligationAccretionExpense
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20,055us-gaap_AssetRetirementObligationAccretionExpense
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| General and administrative expenses |
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86,999us-gaap_GeneralAndAdministrativeExpense
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81,874us-gaap_GeneralAndAdministrativeExpense
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82,017us-gaap_GeneralAndAdministrativeExpense
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| Derivative (gain) loss |
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(3,965)us-gaap_GainLossOnDerivativeInstrumentsNetPretax
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8,470us-gaap_GainLossOnDerivativeInstrumentsNetPretax
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13,954us-gaap_GainLossOnDerivativeInstrumentsNetPretax
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| Total costs and expenses |
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886,640us-gaap_CostsAndExpenses
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837,357us-gaap_CostsAndExpenses
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705,181us-gaap_CostsAndExpenses
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| Operating income |
(30,543)us-gaap_OperatingIncomeLoss
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20,983us-gaap_OperatingIncomeLoss
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34,403us-gaap_OperatingIncomeLoss
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37,225us-gaap_OperatingIncomeLoss
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622us-gaap_OperatingIncomeLoss
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[1],[2] |
31,965us-gaap_OperatingIncomeLoss
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[1],[2] |
53,823us-gaap_OperatingIncomeLoss
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[1],[2] |
60,321us-gaap_OperatingIncomeLoss
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[1],[2] |
62,068us-gaap_OperatingIncomeLoss
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146,731us-gaap_OperatingIncomeLoss
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169,310us-gaap_OperatingIncomeLoss
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| Interest expense: |
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| Incurred |
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86,922us-gaap_InterestCostsIncurred
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85,639us-gaap_InterestCostsIncurred
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63,268us-gaap_InterestCostsIncurred
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| Capitalized |
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(8,526)us-gaap_InterestCostsCapitalizedAdjustment
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(10,058)us-gaap_InterestCostsCapitalizedAdjustment
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(13,274)us-gaap_InterestCostsCapitalizedAdjustment
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| Other income, net |
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208us-gaap_OtherNonoperatingIncomeExpense
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8,946us-gaap_OtherNonoperatingIncomeExpense
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215us-gaap_OtherNonoperatingIncomeExpense
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| Income (loss) before income tax expense (benefit) |
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(16,120)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
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80,096us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
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119,531us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
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| Income tax expense (benefit) |
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(4,459)us-gaap_IncomeTaxExpenseBenefit
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28,774us-gaap_IncomeTaxExpenseBenefit
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47,547us-gaap_IncomeTaxExpenseBenefit
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| Net income (loss) |
$ (33,371)us-gaap_NetIncomeLoss
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$ 684us-gaap_NetIncomeLoss
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$ 9,837us-gaap_NetIncomeLoss
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$ 11,189us-gaap_NetIncomeLoss
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$ (11,886)us-gaap_NetIncomeLoss
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[1],[2] |
$ 14,194us-gaap_NetIncomeLoss
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[1],[2] |
$ 22,396us-gaap_NetIncomeLoss
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[1],[2] |
$ 26,618us-gaap_NetIncomeLoss
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[1],[2] |
$ (11,661)us-gaap_NetIncomeLoss
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$ 51,322us-gaap_NetIncomeLoss
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$ 71,984us-gaap_NetIncomeLoss
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| Basic and diluted earnings (loss) per common share |
$ (0.44)us-gaap_EarningsPerShareBasicAndDiluted
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[1] |
$ 0.01us-gaap_EarningsPerShareBasicAndDiluted
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[1] |
$ 0.13us-gaap_EarningsPerShareBasicAndDiluted
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[1] |
$ 0.15us-gaap_EarningsPerShareBasicAndDiluted
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[1] |
$ (0.16)us-gaap_EarningsPerShareBasicAndDiluted
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[1],[2] |
$ 0.19us-gaap_EarningsPerShareBasicAndDiluted
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[1],[2] |
$ 0.29us-gaap_EarningsPerShareBasicAndDiluted
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[1],[2] |
$ 0.35us-gaap_EarningsPerShareBasicAndDiluted
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[1],[2] |
$ (0.16)us-gaap_EarningsPerShareBasicAndDiluted
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$ 0.68us-gaap_EarningsPerShareBasicAndDiluted
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$ 0.95us-gaap_EarningsPerShareBasicAndDiluted
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