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Goodwill and Intangible Assets - Goodwill Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill    
Balance (beginning of period) $ 38,165 $ 17,851
Goodwill additions related to acquisitions 2,262,622 20,356
Measurement period adjustments (4,003) 571
Effect of exchange rate   (613)
Balance (end of period) $ 2,296,784 $ 38,165