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Consolidated Statements of Comprehensive Income (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 $ 100,828us-gaap_NetIncomeLoss $ 29,781us-gaap_NetIncomeLoss $ 32,868us-gaap_NetIncomeLoss
Other comprehensive income, net of tax:      
Net change in fair value of derivatives, net of tax expense of $586, $482 and $828, respectively 2,466us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 17,120us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 30,614us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Net derivative loss reclassified into earnings 34,979us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 33,265us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 30,777us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Other comprehensive income 37,445us-gaap_OtherComprehensiveIncomeLossNetOfTax 50,385us-gaap_OtherComprehensiveIncomeLossNetOfTax 61,391us-gaap_OtherComprehensiveIncomeLossNetOfTax
Total comprehensive income $ 138,273us-gaap_ComprehensiveIncomeNetOfTax $ 80,166us-gaap_ComprehensiveIncomeNetOfTax $ 94,259us-gaap_ComprehensiveIncomeNetOfTax