Income Taxes (Schedule 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 Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. Federal	$ (12,243)	$ (4,575)	$ (2,597)
State and local	(7,679)	(12,026)	(3,166)
Total current	(19,922)	(16,601)	(5,763)
U.S. Federal	(61,248)	277,916	669
State and local	(7,975)	47,307	(477)
Total deferred	(69,223)	325,223	192
Total income tax (provision) benefit	$ (89,145)	$ 308,622	$ (5,571)