Income Taxes (Schedule Of Federal And State And Foreign Income Tax Provision) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal, current	$ 159,774	$ 155,273	$ 153,856
State, current	7,756	8,744	11,542
Foreign, current	5,224	5,254	4,727
Current federal, state and foreign income tax	172,754	169,271	170,125
Federal, deferred	(5,343)	1,667	(2,214)
State, deferred	1,414	11	(16,264)
Foreign, deferred	0	0	(4,814)
Deferred income tax expense (benefit)	(3,929)	1,678	(23,292)
Income taxes attributable to the Noncontrolling interest	0	0	91
Total income taxes	$ 168,825	$ 170,949	$ 146,924