Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current, Federal	$ 99,783	$ 93,853	$ 80,620
Current, State	8,338	7,733	7,192
Current, Foreign	17,479	17,854	24,495
Deferred, Federal	(13,368)	(14,472)	(18,536)
Deferred, State	(1,036)	(1,987)	(1,915)
Deferred, Foreign	3,483	1,263	1,593
Total	$ 114,679	$ 104,244	$ 93,449