Income Taxes (Schedule Of Components Of Provision (Benefit) For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Provision Benefit For Income Taxes [Line Items]
Provision (benefit) for deferred income taxes	$ (1,970)	$ 5,996	$ (908)
Provision for income taxes	82,330	72,668	60,809
Current [Member]
Provision Benefit For Income Taxes [Line Items]
Federal	59,887	45,549	44,833
State	5,879	5,591	5,079
International	18,534	15,532	11,805
Provision for current income taxes	84,300	66,672	61,717
Deferred [Member]
Provision Benefit For Income Taxes [Line Items]
Federal	(198)	6,823	958
State	72	313	(230)
International	(1,844)	(1,140)	(1,636)
Provision (benefit) for deferred income taxes	$ (1,970)	$ 5,996	$ (908)