Income Taxes (Schedule Of Components Of Provision (Benefit) For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Provision Benefit For Income Taxes [Line Items]
Provision (benefit) for deferred income taxes	$ 20,881	$ 5,143	$ 830
Provision for income taxes	99,792	81,006	64,604
Current [Member]
Provision Benefit For Income Taxes [Line Items]
Federal	53,285	52,966	39,713
State	6,608	5,353	4,692
International	19,291	17,681	20,213
Provision for current income taxes	79,184	76,000	64,618
Deferred [Member]
Provision Benefit For Income Taxes [Line Items]
Federal	20,305	5,762	2,301
State	1,196	526	33
International	(893)	(1,282)	(2,348)
Provision (benefit) for deferred income taxes	$ 20,608	$ 5,006	$ (14)