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Investments - Net Realized and Unrealized Investment (Losses) Gains (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Net realized and unrealized investment gains (losses) $ 454,319 $ 886,670 $ (389,632)
Trading securities      
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Net realized investment gains (losses) on trading securities 15,930 250,883 (201,950)
Change in net unrealized investment gains (losses) 444,508 638,764 (181,560)
Net realized and unrealized investment gains (losses) 454,319 886,670 (389,632)
Trading securities | Fixed maturities and short term investments      
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Net realized investment gains (losses) on trading securities 24,828 243,508 (224,887)
Change in net unrealized investment gains (losses) 219,946 190,343 (150,926)
Trading securities | Equities      
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Net realized investment gains (losses) on trading securities 21,538 6,545 14,601
Change in net unrealized investment gains (losses) 167,456 403,011 2,791
Trading securities | Other invested assets      
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Net realized investment gains (losses) on trading securities (30,436) 830 7,136
Change in net unrealized investment gains (losses) 58,452 44,441 (25,607)
Trading securities | Funds Held - Directly Managed      
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Net realized investment gains (losses) on trading securities [1] 0 0 1,200
Change in net unrealized investment gains (losses) [1] 0 0 (6,484)
Trading securities | Other realized and unrealized investments gains (losses)      
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Change in net unrealized investment gains (losses) (1,346) 969 (1,334)
Almacantar | Real Estate Investment      
Schedule of Net Realized and Unrealized Investment (Losses) Gains      
Impairment loss on investments in real estate $ (6,119) $ (2,977) $ (6,122)
[1] The funds held–directly managed account was settled in 2018 upon commutation of the related Paris Re Reserve Agreement. See also Note 7(a) for further details.