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Goodwill And Other Intangible Assets (Summary Of Amortization Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Goodwill And Other Intangible Assets [Abstract]        
Amortization expense $ 2,707 $ 1,140 $ 8,195 $ 3,423