Income Taxes (Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current, Federal	$ 284,489	$ 363,803	$ 394,904
Current, State	28,406	37,811	30,997
Current, Foreign	19,017	12,826	20,429
Total Current	331,912	414,440	446,330
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]
Deferred, Federal	(4,250)	(15,474)	(5,743)
Deferred, State	7,038	(2,264)	(3,155)
Deferred, Foreign	(2,953)	1,254	1,277
Total, Deferred	(165)	(16,484)	(7,621)
Total Current and Deferred	$ 331,747	$ 397,956	$ 438,709