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INVESTMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on investments $ (641,500) $ (42,071) $ (1,968,624) $ (196,616)
Fixed maturity investments trading        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) on fixed maturity investments trading (213,493) 27,501 (621,799) 81,060
Net unrealized gains (losses) on fixed maturity investments trading (210,665) (56,869) (824,662) (289,872)
Net realized and unrealized gains (losses) on fixed maturity investments trading (424,158) (29,368) (1,446,461) (208,812)
Derivatives        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on investments-related derivatives (55,580) (2,056) (161,946) 3,476
Equity investments trading        
Gain (Loss) on Securities [Line Items]        
Net realized gains (losses) on equity investments trading 3,066 52,604 38,638 255,902
Net unrealized gains (losses) on equity investments trading (46,301) (74,284) (222,074) (279,938)
Net realized and unrealized gains (losses) on equity investments trading (43,235) (21,680) (183,436) (24,036)
Catastrophe bonds        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on other investments (126,992) (5,994) (159,913) (25,075)
Other        
Gain (Loss) on Securities [Line Items]        
Net realized and unrealized gains (losses) on other investments $ 8,465 $ 17,027 $ (16,868) $ 57,831