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Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]      
Goodwill beginning balance $ 480,065 $ 446,318 $ 336,982
Acquisitions 58,315 34,041 123,144
Foreign currency translation adjustments 3,935 (321) (13,808)
Other adjustments (76) 27  
Goodwill ending balance $ 542,239 $ 480,065 $ 446,318