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Income Taxes (Schedule Of Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Unrecognized tax benefits balance at January 1 $ 656 $ 635 $ 611
Gross increases for tax positions of prior years 257 229 489
Gross decreases for tax positions of prior years     (274)
Settlements (107) (208) (182)
Lapse of statute of limitations     (9)
Unrecognized tax benefits balance at December 31 $ 806 $ 656 $ 635