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Sale of BondPoint- Summary of Carrying Value and Gain on Sale (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Total sale proceeds received   $ 60,592 $ 0 $ 400,192  
Liabilities         $ (728)
Gain on sale, net of transaction costs   $ 58,652 $ 0 335,211  
BondPoint | Disposal Group, Disposed of by Sale, Not Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Total sale proceeds received $ 400,200     $ 400,192  
Receivables from broker dealers and clearing organizations         3,383
Intangibles and other assets         51,687
Total carrying value of BondPoint as of December 31, 2017:         $ 54,342
Goodwill adjustment allocated to BondPoint 8,300        
Gain on sale of MATCHNow 337,550        
Transaction costs 8,568        
Gain on sale, net of transaction costs $ 328,982