Income Taxes (Schedule 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
Provision Benefit For Income Taxes [Line Items]
Provision (benefit) for deferred income taxes	$ 830us-gaap_DeferredIncomeTaxExpenseBenefit	$ 2,073us-gaap_DeferredIncomeTaxExpenseBenefit	$ (1,970)us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes	64,604us-gaap_IncomeTaxExpenseBenefit	75,467us-gaap_IncomeTaxExpenseBenefit	82,330us-gaap_IncomeTaxExpenseBenefit
Current [Member]
Provision Benefit For Income Taxes [Line Items]
Federal	39,713	50,999	59,887
State	4,692	5,639	5,879
International	20,213	16,657	18,534
Provision for current income taxes	64,618	73,295	84,300
Deferred [Member]
Provision Benefit For Income Taxes [Line Items]
Federal	2,301	3,203	(198)
State	33	329	72
International	(2,348)	(1,360)	(1,844)
Provision (benefit) for deferred income taxes	$ (14)	$ 2,172	$ (1,970)

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