Income Taxes (Components Of Income Before Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Domestic	$ 593,099	$ 788,878	$ 954,138
Foreign	93,530	74,961	69,773
Income before provision for income taxes	$ 686,629	$ 863,839	$ 1,023,911