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Acquisitions - Assets acquired and liabilities assumed (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 6,919,109 $ 6,787,635 $ 6,841,960
Series of individually immaterial business acquisitions      
Business Acquisition [Line Items]      
Current assets 23,607 6,713 23,686
Property and equipment 37,457 4,842 11,421
Customer relationships 34,625 0 0
Noncompetition agreements and other long-term assets 10,168 1,980 3,079
Indefinite-lived licenses 22,136 31,858 23,656
Goodwill 130,057 90,226 278,348
Deferred income taxes (3,962) 0 0
Liabilities Assumed (34,068) (7,159) (19,946)
Noncontrolling interests assumed (1,729) (1,762) (80,291)
Aggregate purchase price $ 218,291 $ 126,698 $ 239,953