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Related Party Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2016
Exor N.V.          
Related Party Transaction [Line Items]          
Related Party Advisory Services Agreement $ 350 $ 500 $ 500    
Exor N.V. | Real estate services          
Related Party Transaction [Line Items]          
Related Party Consulting Services Agreement 433 310 221    
Exor N.V. | Investment advisory services          
Related Party Transaction [Line Items]          
Related Party Consulting Services Agreement 2,600        
Related Party Advisory Services Agreement 175 259 254    
Exor N.V. | Private equity funds          
Related Party Transaction [Line Items]          
Investment carrying value 468,000        
Net realized and unrealized gain (loss) on related party investment 115,000        
Exor N.V. | Other invested assets          
Related Party Transaction [Line Items]          
Investment carrying value   51,000      
Transaction amount 51,000        
Exor N.V. | Equity funds          
Related Party Transaction [Line Items]          
Investment carrying value 1,154,000 1,039,000      
Payments to acquire investments       $ 500,000  
Net realized and unrealized gain (loss) on related party investment 115,000 91,000 385,000    
Almacantar | Almacantar Group S.A.          
Related Party Transaction [Line Items]          
Ownership percentage         36.00%
Retained earnings          
Related Party Transaction [Line Items]          
Dividends on common shares $ 106,667 $ 50,000 $ 199,386