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Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Goodwill beginning balance $ 480,065 $ 446,318
Acquisitions 81,990 34,041
Foreign currency translation adjustments 19,195 (321)
Other adjustments (76) 27
Goodwill ending balance $ 581,174 $ 480,065