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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

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