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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, 2014	Dec. 31, 2013	Dec. 31, 2012
Current provision:
Federal	$ 119,074us-gaap_CurrentFederalTaxExpenseBenefit	$ 104,890us-gaap_CurrentFederalTaxExpenseBenefit	$ 147,580us-gaap_CurrentFederalTaxExpenseBenefit
State	19,858	15,627	14,673
Foreign	2,907us-gaap_CurrentForeignTaxExpenseBenefit	1,918us-gaap_CurrentForeignTaxExpenseBenefit	1,109us-gaap_CurrentForeignTaxExpenseBenefit
Deferred provision (benefit):
Federal	11,514	(12,025)	5,027
State	840	(1,035)	(206)
Total income tax provision	$ 154,193us-gaap_IncomeTaxExpenseBenefit	$ 109,375us-gaap_IncomeTaxExpenseBenefit	$ 168,183us-gaap_IncomeTaxExpenseBenefit

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.