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Variable Interest Entities and Noncontrolling Interests - Redeemable noncontrolling interests (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Aug. 01, 2019
Mar. 31, 2020
Mar. 31, 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   55,376      
Watford Holdings Ltd          
Redeemable Noncontrolling Interest [Line Items]          
Redeemable noncontrolling interests, beginning of period   55,404 $ 206,292    
Accretion of preference share issuance costs   23 91    
Other   (51) 0    
Redeemable noncontrolling interests, end of period   55,376 $ 206,383    
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   $ 52,328