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Goodwill And Other Intangible Assets (Gross Carrying Amount Accumulated Amortization and Net Book Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]    
Gross carrying amount $ 15,925 $ 15,925
Accumulated amortization (6,137) (5,814)
Net book value $ 9,788 $ 10,111