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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Goodwill And Other Intangible Assets [Abstract]        
Amortization expense $ 3,397 $ 2,660 $ 9,430 $ 7,796