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Variable Interest Entities and Noncontrolling Interests - Redeemable noncontrolling interests (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Aug. 01, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jul. 31, 2019
Mar. 31, 2014
Redeemable Noncontrolling Interest [Line Items]              
Redeemable noncontrolling interests, beginning of period       $ 55,404      
Redeemable noncontrolling interests, end of period   $ 57,835   57,835      
Watford Holdings Ltd              
Redeemable Noncontrolling Interest [Line Items]              
Redeemable noncontrolling interests, beginning of period   55,986 $ 206,475 55,404 $ 206,292    
Redemption of noncontrolling interests   0 (157,709) 0 (157,709)    
Accretion of preference share issuance costs   23 23 70 206    
Other   1,826 0 2,361 0    
Redeemable noncontrolling interests, end of period   57,835 $ 48,789 57,835 $ 48,789    
Cumulative redeemable preference shares | Watford Holdings Ltd              
Redeemable Noncontrolling Interest [Line Items]              
Par value per share             $ 0.01
Liquidation preference per share             25.00
Issue price per share             $ 24.50
Variable Interest Entity, Primary Beneficiary | Watford Holdings Ltd              
Redeemable Noncontrolling Interest [Line Items]              
Preference shares, number of shares issued           9,065,200  
Number of preference shares redeemed 6,919,998            
Preferred shares, redemption price $ 25.19748            
Preference shares redeemed $ 11,500            
Redeemable noncontrolling interests, beginning of period       52,305      
Redeemable noncontrolling interests, end of period   $ 52,375   $ 52,375