Income Taxes (Schedule Of Income Tax Expense (Benefit)) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Income Taxes [Abstract]
Federal, current	$ 8,580,000	[1]	$ (48,528,000)	[2]	$ 94,190,000	[3]
State, current	6,476,000	[1]	1,704,000	[2]	15,060,000	[3]
Foreign, current	598,000	[1]	2,050,000	[2]	3,295,000	[3]
Total current income tax expense (benefit)	15,654,000	[1]	(44,774,000)	[2]	112,545,000	[3]
Federal, deferred	(399,773,000)	[1]	107,094,000	[2]	33,704,000	[3]
State, deferred	(71,698,000)	[1]	9,715,000	[2]	5,132,000	[3]
Foreign, deferred	(994,000)	[1]	1,447,000	[2]	464,000	[3]
Total deferred income tax expense (benefit)	(472,465,000)	[1]	118,256,000	[2]	39,300,000	[3]
Total, Amount	(456,811,000)	[1]	73,482,000	[2]	151,845,000	[3]
Income tax benefit related to discontinued operations	$ 500,000		$ 8,700,000		$ 300,000

[1] Excludes $0.5 million in income tax expense related to discontinued operations.

[2] Excludes $8.7 million in income tax benefit related to discontinued operations.

[3] Excludes $0.3 million in income tax benefit related to discontinued operations.