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Income Taxes (Summary Of Provision For Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Deferred Tax Assets And Liabilities [Line Items]      
Federal, Current $ 14,356 $ 14,959 $ 14,700
State and local, Current 3,230 2,303 1,619
Foreign, Current 32 47  
Current income tax expense, total 17,618 17,309 16,319
Federal, Deferred 18,146 9,411 4,560
State and local, Deferred 365 (85) 741
Foreign, Deferred (10)    
Deferred income tax expense, total 18,821 9,545 5,519
Total provision 36,119 26,635 21,620
Deferred Income Tax Charges [Member]
      
Deferred Tax Assets And Liabilities [Line Items]      
Deferred income tax expense, total $ 18,501 $ 9,326 $ 5,301