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Income Taxes (Schedule Of Income Tax Provision) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Federal, Current $ 53,344 $ 70,967 $ 57,690
State, Current 12,081 14,815 13,256
Total Current 65,425 85,782 70,946
Federal, Deferred 4,760 (71) (1,697)
State, Deferred (707) 28 (565)
Total deferred 4,053 (43) (2,262)
Total provision for income taxes $ 69,478 $ 85,739 $ 68,684