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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