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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (USD $)
In Thousands, 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
Statement of Comprehensive Income [Abstract]                      
Net income (loss) $ (190,515)us-gaap_NetIncomeLoss [1] $ (29,415)us-gaap_NetIncomeLoss [2] $ 4,444us-gaap_NetIncomeLoss $ 25,943us-gaap_NetIncomeLoss $ 1,752us-gaap_NetIncomeLoss [3],[4] $ 36,102us-gaap_NetIncomeLoss $ 39,022us-gaap_NetIncomeLoss $ 40,758us-gaap_NetIncomeLoss $ (189,543)us-gaap_NetIncomeLoss $ 117,634us-gaap_NetIncomeLoss $ 149,426us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax effect:                      
Derivatives                 88,178us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax (30,228)us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax 6,965us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
Foreign currency translation                 (2,801)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax (667)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax  
Comprehensive income (loss)                 $ (104,166)us-gaap_ComprehensiveIncomeNetOfTax $ 86,739us-gaap_ComprehensiveIncomeNetOfTax $ 156,391us-gaap_ComprehensiveIncomeNetOfTax
[1] Includes a write-down of oil and gas properties of $304,062 before income tax effect ($194,600 net of income tax effect).
[2] Includes a write-down of oil and gas properties of $47,130 before income tax effect ($30,163 net of income tax effect).
[3] Includes franchise tax settlement of $12,590 before income tax effect ($8,058 net of income tax effect).
[4] Includes loss on early extinguishment of debt of $27,279 before income tax effect ($17,459 net of income tax effect).