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Income Taxes - Summary of components of provision (benefit) for income taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current provision:
Federal	$ 104,890	$ 147,580	$ 91,415
State	15,627	14,673	12,938
Foreign	1,918	1,109	1,007
Deferred (benefit) provision:
Federal	(12,025)	5,027	70,599
State	(1,035)	(206)	6,475
Total income tax provision	$ 109,375	$ 168,183	$ 182,434

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.