Income Taxes (Schedule Of Total Provision For Income Taxes) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Federal, current	$ 15,000,000	$ 43,500,000	$ 56,500,000
State and local, current	3,600,000	9,500,000	10,800,000
Current income tax expense	18,600,000	53,000,000	67,300,000
Federal, deferred	(102,700,000)	24,200,000	18,700,000
State and local, deferred	(19,300,000)	1,700,000	2,900,000
Deferred income tax expense/(benefit)	(121,949,000)	25,927,000	21,547,000
Income tax expense/(benefit)	$ (103,426,000)	$ 78,923,000	$ 88,875,000