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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Beginning balance $ 214,513 $ 149,524
Additions due to acquisitions 70,167 65,181
Foreign currency translation adjustment 2 (192)
Ending balance $ 284,682 $ 214,513