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Related Party Transactions (Details)
€ in Thousands, $ in Thousands, £ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
GBP (£)
Dec. 31, 2016
EUR (€)
Related Party Transaction [Line Items]          
Investments in real estate $ 71,834 $ 72,573      
Retained earnings          
Related Party Transaction [Line Items]          
Dividends on common shares 199,386 47,835 $ 144,693    
Almacantar | Real Estate Investment          
Related Party Transaction [Line Items]          
Payments to Acquire Real Estate and Real Estate Joint Ventures     83,000 £ 55  
Other than Temporary Impairment Losses, Investments (2,977) (6,122) 0    
Exor N.V.          
Related Party Transaction [Line Items]          
Related Party Advisory Services Agreement 500 500     € 300
Payment to Related Parties (Less than)     500    
Exor N.V. | Investment advisory services [Member]          
Related Party Transaction [Line Items]          
Related Party Advisory Services Agreement 254 273      
Exor N.V. | Real estate services [Member]          
Related Party Transaction [Line Items]          
Related Party Consulting Services Agreement 221 45 45    
Exor N.V. | Private equity funds          
Related Party Transaction [Line Items]          
Payments to acquire investments     500,000    
Investment carrying value 948,000 563,000      
Net realized and unrealized gain (loss) on related party investment 385,000 12,000 $ 51,000    
Exor N.V. | Other invested assets          
Related Party Transaction [Line Items]          
Investment carrying value $ 32,000 $ 11,000