Income Taxes (Components Of Income Before Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Domestic	$ 954,138	$ 1,101,427	$ 1,196,335
Foreign	69,773	48,736	86,985
Income before provision for income taxes	$ 1,023,911	$ 1,150,163	$ 1,283,320