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Goodwill and Other Intangible Assets - Change in carrying amount of goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill And Other Intangible Assets Disclosure [Abstract]    
Goodwill, Beginning Balance $ 36,336 $ 38,032
Goodwill arising through business combination 21,865  
Reclasification of goodwill as held for sale   (3,633)
Effect of change in currency translation (897) 1,937
Goodwill, Ending Balance $ 57,304 $ 36,336