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Variable Interest Entity and Noncontrolling Interests - Redeemable noncontrolling interest (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Aug. 01, 2019
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2019
Redeemable Noncontrolling Interest [Line Items]              
Balance, beginning of year       $ 55,404 $ 206,292 $ 205,922  
Redemption of noncontrolling interests       0 (157,709) 0  
Accretion of preference share issuance costs       93 244 370  
Other       3,051 6,577 0  
Balance, end of year       $ 58,548 55,404 206,292  
Preferred shares, par value per share       $ 0.01      
Watford Holdings Ltd              
Redeemable Noncontrolling Interest [Line Items]              
Preferred dividends including accretion of discount and issuance costs       $ 4,400 $ 17,800 $ 19,600  
Variable Interest Entity, Primary Beneficiary | Watford Holdings Ltd              
Redeemable Noncontrolling Interest [Line Items]              
Preference shares, number of shares issued             9,065,200
Shares redeemed during the period, shares 6,919,998            
Preferred shares, redemption price per share $ 25.19748            
Proceeds from Redemption Of Preferred Shares By Variable Interest Entity $ 11,500            
Redeemable Preferred Stock [Member] | Watford Holdings Ltd              
Redeemable Noncontrolling Interest [Line Items]              
Preferred shares, par value per share     $ 0.01        
Liquidation preference per share     25.00        
Shares Issued, Price Per Share     $ 24.50        
Preferred shares, dividend rate (as a percent)     8.50%        
Redeemable Preferred Stock [Member] | 3 month US dollar LIBOR | Watford Holdings Ltd              
Redeemable Noncontrolling Interest [Line Items]              
Preferred shares, dividend rate (as a percent)   1.00%