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Income Taxes Provision for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal, Current	$ 146,633us-gaap_CurrentFederalTaxExpenseBenefit	$ 114,687us-gaap_CurrentFederalTaxExpenseBenefit	$ 99,354us-gaap_CurrentFederalTaxExpenseBenefit
State, Current	33,054	27,358	24,339
Foreign, Current	15,377us-gaap_CurrentForeignTaxExpenseBenefit	16,598us-gaap_CurrentForeignTaxExpenseBenefit	25,603us-gaap_CurrentForeignTaxExpenseBenefit
Federal and state, Deferred	(4,626)	(7,759)	(15,188)
Foreign, Deferred	983	(5,500)	195
Provision (benefit) for income taxes	$ 191,421us-gaap_IncomeTaxExpenseBenefit	$ 145,384us-gaap_IncomeTaxExpenseBenefit	$ 134,303us-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 foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.