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Goodwill and Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Balance $ 336,539 $ 335,887
Additions 161,117 0
Foreign currency exchange rate fluctuations 1,653 652
Balance $ 499,309 $ 336,539