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Business Combinations - Prior Year Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Nov. 23, 2020	Dec. 31, 2019	Jun. 01, 2017
Business Acquisition [Line Items]
Total consideration	$ 0	$ 0
Goodwill	6,036,515		$ 6,042,964	$ 2,861	$ 1,328,045
TrademarkVision
Business Acquisition [Line Items]
Contingent stock liability	0		0
Kopernio
Business Acquisition [Line Items]
Contingent consideration	0	$ 0
Publons
Business Acquisition [Line Items]
Contingent stock liability	$ 0		$ 0
Contingent consideration						$ 9,500

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- Definition

Fair value portion of liability recognized arising from contingent consideration in a business combination.

+ References

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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