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Goodwill And Other Intangible Assets (Schedule Of Changes In Carrying Amount Of Goodwill) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Goodwill And Other Intangible Assets [Abstract]    
Goodwill, Beginning Balance $ 303,703 $ 303,257
Acquired goodwill 15,737 446
Goodwill, Ending Balance $ 319,440 $ 303,703