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Goodwill - Schedule of Goodwill Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Goodwill    
Net balance at beginning of period $ 91,841  
Net foreign currency translation 889  
Net balance at end of period 92,730  
Goodwill impairment $ 0 $ 0