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Goodwill (Summary of Changes in Goodwill) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Goodwill [Roll Forward]        
Goodwill, beginning balance     $ 10,039  
Impairments $ (10,039) $ 0 (10,039) $ 0
Goodwill, ending balance $ 0   $ 0