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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ (120,960)us-gaap_NetIncomeLoss $ 11,323us-gaap_NetIncomeLoss
Change in fair value of derivative instruments, accounted for as hedges, net of income tax expense of $947 and $0, respectively 1,598us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet (3,418)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Comprehensive income (loss) $ (119,362)us-gaap_ComprehensiveIncomeNetOfTax $ 7,905us-gaap_ComprehensiveIncomeNetOfTax