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INVESTMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Gain (Loss) on Securities [Line Items]    
Net realized and unrealized gains (losses) on investments $ 279,451 $ (673,017)
Fixed maturity investments trading    
Gain (Loss) on Securities [Line Items]    
Net realized gains (losses) on fixed maturity investments trading (104,765) (121,152)
Net unrealized gains (losses) on fixed maturity investments trading 312,026 (464,177)
Net realized and unrealized gains (losses) on fixed maturity investments trading 207,261 (585,329)
Derivatives    
Gain (Loss) on Securities [Line Items]    
Net realized and unrealized gains (losses) on investments-related derivatives 12,162 (40,288)
Equity investments    
Gain (Loss) on Securities [Line Items]    
Net realized gains (losses) on equity investments (8,738) (20)
Net unrealized gains (losses) on equity investments 39,151 (48,669)
Net realized and unrealized gains (losses) on equity investments 30,413 (48,689)
Catastrophe bonds    
Gain (Loss) on Securities [Line Items]    
Net realized and unrealized gains (losses) on other investments 24,126 (8,261)
Other    
Gain (Loss) on Securities [Line Items]    
Net realized and unrealized gains (losses) on other investments $ 5,489 $ 9,550