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Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 31,190us-gaap_NetIncomeLoss $ 14,082us-gaap_NetIncomeLoss $ (132,079)us-gaap_NetIncomeLoss
Change in fair value of derivatives, net of income tax (expense) benefit of ($3,211), $309 and $2,079 respectively 6,516us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet (1,617)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet (3,510)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Comprehensive income (loss) $ 37,706us-gaap_ComprehensiveIncomeNetOfTax $ 12,465us-gaap_ComprehensiveIncomeNetOfTax $ (135,589)us-gaap_ComprehensiveIncomeNetOfTax