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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

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- Definition Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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