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Acquisitions and Divestitures - Aggregate Purchase Cost Allocations for Acquisitions (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 6,610,279 $ 6,015,375 $ 5,896,215
Series of individually immaterial business acquisitions      
Business Acquisition [Line Items]      
Current assets, net of cash acquired 14,366 3,996 2,647
Property and equipment 18,192 8,840 4,466
Amortizable intangible and other long-term assets 11,663 5,876 8,924
Non-amortizable intangibles 32,296 0 0
Goodwill 318,832 198,927 67,183
Deferred income taxes, liabilities (210)   (717)
Deferred income taxes, assets   597  
Noncontrolling interests assumed (44,303) (30,337) (18,905)
Liabilities assumed (15,846) (3,317) (1,595)
Aggregate purchase price $ 334,990 $ 184,582 $ 62,003