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