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Goodwill - Schedule of Goodwill Activity (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Goodwill    
Net balance at beginning of period $ 91,841  
Adjustment to provisional estimate of acquisition date fair values 1,128  
Net foreign currency translation (66)  
Net balance at end of period 92,903  
Goodwill impairment $ 0 $ 0