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Consolidated Statements of Comprehensive Operations (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 $ 635,491us-gaap_NetIncomeLoss $ 409,597us-gaap_NetIncomeLoss $ 525,360us-gaap_NetIncomeLoss
Other comprehensive income, net of income tax      
Interest rate lock derivative contracts reclassified to income, net of tax of $45, $40 and $43, respectively 67us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 72us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax 70us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Total other comprehensive income 67us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 72us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 70us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income $ 635,558us-gaap_ComprehensiveIncomeNetOfTax $ 409,669us-gaap_ComprehensiveIncomeNetOfTax $ 525,430us-gaap_ComprehensiveIncomeNetOfTax