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Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Goodwill    
Beginning balance $ 14,581,255 $ 746,079
Additions associated with acquisitions 47,328 13,812,198
Purchase consideration adjustment (61,108) 0
Deferred tax adjustment (106,532) 0
Cumulative translation adjustment (8,968) 22,978
Goodwill $ 14,451,975 $ 14,581,255