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Related Party Transactions - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2014
Related Party Transactions            
Other assets   $ 25,027   $ 27,236    
Contingent consideration recognized     $ 26,830   $ 58,520  
Consulting service fee for IPO $ 1,000          
Consulting service fee for follow on offering $ 500          
Adjustment to additional paid in capital due to consulting service fee       1,500    
Refinitiv            
Related Party Transactions            
Other assets       2,700    
Refinitiv | Operating Expense Reimbursement            
Related Party Transactions            
Related party expense   $ 3,800   $ 6,700    
TR | Operating Expense Reimbursement            
Related Party Transactions            
Related party expense     $ 28,700   $ 38,400  
Banks            
Related Party Transactions            
Capital contribution           $ 120,000
Employees            
Related Party Transactions            
Investment by employees           $ 5,300