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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2021
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
Goodwill, beginning balance $ 939,259
Goodwill acquired 554,660
Foreign currency translation (9,811)
Goodwill, ending balance $ 1,484,108