Income Taxes (Components of the Provision for Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
Federal	$ 22,377us-gaap_CurrentFederalTaxExpenseBenefit	$ 51,389us-gaap_CurrentFederalTaxExpenseBenefit	$ 81,019us-gaap_CurrentFederalTaxExpenseBenefit
Foreign	30,878us-gaap_CurrentForeignTaxExpenseBenefit	37,221us-gaap_CurrentForeignTaxExpenseBenefit	30,059us-gaap_CurrentForeignTaxExpenseBenefit
State	7,710	11,605	17,395
Total current	60,965us-gaap_CurrentIncomeTaxExpenseBenefit	100,215us-gaap_CurrentIncomeTaxExpenseBenefit	128,473us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
Federal	(26,922)	(34,897)	(64,960)
Foreign	(1,023)	(8,413)	1,409
State	(9,037)	(8,538)	(7,240)
Total deferred	(36,982)us-gaap_DeferredIncomeTaxExpenseBenefit	(51,848)us-gaap_DeferredIncomeTaxExpenseBenefit	(70,791)us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision	$ 23,983us-gaap_IncomeTaxExpenseBenefit	$ 48,367us-gaap_IncomeTaxExpenseBenefit	$ 57,682us-gaap_IncomeTaxExpenseBenefit

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