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Business Combinations - Prior Year Acquisitions (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Nov. 23, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | Jun. 01, 2017
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Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 6,198,701 | $ 6,252,636 | $ 2,861 |  | $ 1,328,045 |
TrademarkVision |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent stock liability |  | 0 |  |  |  |
Kopernio |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration |  |  |  | $ 2,184 |  |
Publons |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent stock liability |  | $ 0 |  |  |  |
Contingent consideration |  |  |  |  |  | $ 9,500

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