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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
Net income $ 215,865us-gaap_NetIncomeLoss [1] $ 188,715us-gaap_NetIncomeLoss [1] $ 531,421us-gaap_NetIncomeLoss
Other comprehensive income, net of tax:      
Unrealized gain on interest rate swaps   2,228us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 6,419us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Total comprehensive income $ 215,865us-gaap_ComprehensiveIncomeNetOfTax $ 190,943us-gaap_ComprehensiveIncomeNetOfTax $ 537,840us-gaap_ComprehensiveIncomeNetOfTax
[1] Per share amounts do not add across due to rounding differences in quarterly amounts and due to the impact of differences between the quarterly and annual weighted average share calculations.