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Acquisitions and Divestitures - Aggregate Purchase Cost Allocations for Acquisitions (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill $ 6,841,960 $ 6,610,279 $ 6,015,375
Series of individually immaterial business acquisitions      
Business Acquisition [Line Items]      
Current assets, net of cash acquired 23,686 14,366 3,996
Property and equipment 11,421 18,192 8,840
Amortizable intangible and other long-term assets 3,079 11,663 5,876
Non-amortizable intangibles 23,656 32,296 0
Goodwill 278,348 318,832 198,927
Deferred income taxes, liabilities 0 (210)  
Deferred income taxes, assets     597
Noncontrolling interests assumed (80,291) (44,303) (30,337)
Liabilities assumed (19,946) (15,846) (3,317)
Aggregate purchase price $ 239,953 $ 334,990 $ 184,582