Income Taxes (Schedule Of Components Of Income Tax Expense/(Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Current, Federal	$ 165,409	$ 105,077	$ 130,798
Current, Foreign	300	2,555
Current, State	22,901	16,547	18,976
Current, Total	188,610	124,179	149,774
Deferred, Federal and foreign	53,056	26,419	18,524
Deferred, State	5,800	1,704	2,177
Deferred, Total	58,856	28,123	20,701
Provision for income taxes	$ 247,466	$ 152,302	$ 170,475