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Sale of BondPoint - Narrative (Details) - BondPoint - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale of BondPoint   $ 0 $ 400,192 $ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale of BondPoint $ 400,192      
Transaction costs 8,568      
Professional fees 7,100      
Compensation expense 1,400      
Gain on sale of BondPoint, net of transaction costs $ 337,550   $ 337,600 $ 86,600