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Acquisitions (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Acquisition of businesses, net of cash acquired | $ 76,511 | $ 36,214 |
Goodwill | 5,145,477 |  | $ 5,081,887
Series of Individually Immaterial Business Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition of businesses, net of cash acquired | 77,000 |  |
Goodwill | 32,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 28,000 |  |

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