Income Taxes (Summary Of Components Of Income Before Income Taxes And The Provision For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Income (loss) before income taxes-Domestic									$ 252,381	$ 210,819	$ 37,020
Income (loss) before income taxes-Foreign									(44,374)	(9,933)	(7,068)
Income before income tax expense									208,007	200,886	29,952
Income tax expense (benefit)-Current Federal									79,850	45,727	7,614
Income tax expense (benefit)-Current State and local									6,601	9,684	4,018
Income tax expense (benefit)-Current Foreign									337	(33)	16
Income tax expense (benefit)-Current Subtotal									86,788	55,378	11,648
Income tax expense (benefit)-Deferred Federal									1,318	26,926	21,588
Income tax expense (benefit)-Deferred State and local									(8,136)	(4,198)	10,684
Income tax expense (benefit)-Deferred Foreign									(12,622)	(2,828)	(2,891)
Income tax expense (benefit)-Deferred Subtotal									(19,440)	19,211	28,161
Income tax expense	$ 10,219	$ 16,281	$ 16,894	$ 23,954	$ 19,762	$ 23,233	$ 18,440	$ 13,843	$ 67,348	$ 75,278	$ 41,029
Effective income tax rate									32.40%	37.50%	137.00%