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Investments - Schedule of Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Gain (Loss) on Securities [Line Items]      
Net realized and unrealized gains (losses) on fixed maturity investments trading $ (1,369,323) $ (309,788) $ 493,760
Net realized and unrealized gains (losses) on equity investments (123,788) 49,609 265,596
Net realized and unrealized gains (losses) on investments (1,800,485) (218,134) 820,636
Fixed maturity investments      
Gain (Loss) on Securities [Line Items]      
Net realized gains (losses) on fixed maturity investments trading (732,561) 79,588 276,901
Net unrealized gains (losses) on fixed maturity investments trading (636,762) (389,376) 216,859
Investments-related derivatives      
Gain (Loss) on Securities [Line Items]      
Net realized and unrealized gains (losses) on investments-related derivatives (165,293) (12,237) 68,608
Equity investments      
Gain (Loss) on Securities [Line Items]      
Net realized gains (losses) on equity investments 43,035 335,491 3,532
Net unrealized gains (losses) on equity investments (166,823) (285,882) 262,064
Catastrophe bonds      
Gain (Loss) on Securities [Line Items]      
Net realized and unrealized gains (losses) on other investments (130,335) (35,033) (7,031)
Other      
Gain (Loss) on Securities [Line Items]      
Net realized and unrealized gains (losses) on other investments $ (11,746) $ 89,315 $ (297)