Income Taxes (Schedule Of The Provision For (Benefit From) Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Federal, Current	$ 120,018	$ 97,822	$ (3,049)
State, Current	8,729	8,128	(2,306)
Foreign, Current	(395)	1,464	(94)
Total Current	128,352	107,414	(5,449)
Federal, Deferred	6,732	7,083	29,824
State, Deferred	7,682	6,829	660
Foreign, Deferred	(300)	241	723
Total Deferred	14,114	14,153	31,207
Total provision	$ 142,466	$ 121,567	$ 25,758