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Goodwill And Other Intangible Assets (Gross Carrying Amount Accumulated Amortization and Net Book Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]    
Gross carrying amount $ 15,925 $ 13,420
Accumulated amortization (5,484) (4,557)
Net book value $ 10,441 $ 8,863