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Goodwill And Other Intangible Assets (Schedule Of Amortization Expense Of Purchase Accounting Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Goodwill And Other Intangible Assets [Abstract]      
Aggregate amortization expense $ 5,236 $ 5,061 $ 3,008
2012 5,209    
2013 4,768    
2014 4,381    
2015 3,550    
2016 3,177    
2017 and thereafter $ 4,270