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Goodwill And Other Intangible Assets (Summary Of Amortization Expense) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill And Other Intangible Assets [Abstract]      
Amortization expense $ 4,426 $ 2,135 $ 2,027