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INVESTMENTS - Schedule of Fair Value of Fixed Maturity Investments Trading (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Total fixed maturity investments trading $ 24,287,185 $ 20,877,108
U.S. treasuries    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 11,736,158 10,060,203
Corporate    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 7,790,634 6,499,075
Residential mortgage-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 1,753,318 1,420,362
Asset-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 1,440,194 1,491,695
Agencies    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 615,627 489,117
Non-U.S. government    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 609,355 483,576
Commercial mortgage-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading $ 341,899 $ 433,080