Income Taxes (Schedule Of Components Of Provision (Benefit) For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Provision Benefit For Income Taxes [Line Items]
Provision (benefit) for deferred income taxes	$ 5,143	$ 830	$ 2,073
Provision for income taxes	81,006	64,604	75,467
Current [Member]
Provision Benefit For Income Taxes [Line Items]
Federal	52,966	39,713	50,999
State	5,353	4,692	5,639
International	17,681	20,213	16,657
Provision for current income taxes	76,000	64,618	73,295
Deferred [Member]
Provision Benefit For Income Taxes [Line Items]
Federal	5,762	2,301	3,203
State	526	33	329
International	(1,282)	(2,348)	(1,360)
Provision (benefit) for deferred income taxes	$ 5,006	$ (14)	$ 2,172