Income Taxes (Schedule Of Current And Deferred Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Current, Federal	$ 26,548	$ 16,496	$ (25,226)
Current, State	10,905	7,379	429
Current, Total	37,453	23,875	(24,797)
Deferred, Federal	10,133	(28,600)	(26,367)
Deferred, State	3,675	(9,904)	(10,748)
Deferred, Total	13,808	(38,504)	(37,115)
Total income tax (benefit)/expense	$ 51,261	$ (14,629)	$ (61,912)