Income Taxes (Income Tax (Provision) Benefit Attributable To Income From Continuing Operations) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
U.S. federal			$ 21,714
U.S. state	(9,065)	(9,864)	(10,010)
Foreign			(551)
Current income tax (provision) benefit	(9,065)	(9,864)	11,153
U.S. federal	(207,146)	(263,063)	63,970
U.S. state	18,567	3,300	8,072
Deferred income tax (provision) benefit	(188,579)	(259,763)	72,042
Income tax (provision) benefit	$ (197,644)	$ (269,627)	$ 83,195