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Acquisitions - Assets acquired and liabilities assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill $ 7,076,610 $ 7,046,241 $ 6,919,109
Series of individually immaterial business acquisitions      
Business Acquisition [Line Items]      
Current assets 6,389 9,134 23,607
Property and equipment 7,481 9,277 37,457
Customer relationships 0 17,200 34,625
Noncompetition agreements and other long-term assets 1,066 9,964 10,168
Indefinite-lived licenses 19,610 11,432 22,136
Goodwill 49,047 173,244 130,057
Deferred income taxes 0 0 (3,962)
Liabilities Assumed (6,081) (14,200) (34,068)
Noncontrolling interests assumed (867) (3,921) (1,729)
Aggregate purchase price $ 76,645 $ 212,130 $ 218,291