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Condensed Consolidated Statements of Comprehensive Operations (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ (107,746)us-gaap_NetIncomeLoss $ 58,310us-gaap_NetIncomeLoss
Other comprehensive income, net of income tax:    
Interest rate lock derivative contracts reclassified to income, net of tax of $11 and $13, respectively 17us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 15us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Total other comprehensive income 17us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 15us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income (loss) $ (107,729)us-gaap_ComprehensiveIncomeNetOfTax $ 58,325us-gaap_ComprehensiveIncomeNetOfTax