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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]    
Balance at beginning $ 3,581
Disposal on sale of assets   (1,039)
Impairment of goodwill   (2,257)
Translation differences (285)
Balance at ending