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Goodwill (Changes in Goodwill) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Line Items]      
Accumulated impairment losses $ (3,600) $ (3,600) $ (3,600)
Reported goodwill $ 94,697 $ 94,697