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Acquisitions (Details) - USD ($)
$ in Thousands
Jun. 07, 2021
Mar. 02, 2021
Sep. 30, 2021
Dec. 31, 2020
Acquisitions        
Goodwill arising in the acquisition     $ 522,814 $ 518,592
Series of Individually Immaterial Business Acquisitions        
Acquisitions        
Goodwill arising in the acquisition $ 4,700 $ 1,100    
Customer relationships | Series of Individually Immaterial Business Acquisitions        
Acquisitions        
Finite-lived intangible assets acquired $ 7,400 1,200    
Non-compete agreements | Series of Individually Immaterial Business Acquisitions        
Acquisitions        
Finite-lived intangible assets acquired   $ 100