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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Beginning balance $ 214,513 $ 149,524
Additions due to acquisition 0 65,181
Foreign currency translation adjustment (190) (192)
Ending balance $ 214,323 $ 214,513