Income Taxes (Schedule Of Federal And State And Foreign Income Tax Provision) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Expense (Benefit) [Abstract]
Federal, current	$ 112,247	$ 99,448	$ 116,388
State, current	5,284	7,067	8,698
Foreign, current	4,511	4,603	3,365
Current federal, state and foreign income tax	122,042	111,118	128,451
Federal, deferred	(2,708)	(2,317)	6,085
State, deferred	(2,199)	2,477	1,509
Foreign, deferred	3,970	6	0
Deferred income tax expense (benefit)	(937)	166	7,594
Income taxes attributable to the Noncontrolling interest	357	553	416
Total income taxes	$ 121,462	$ 111,837	$ 136,461