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INVESTMENTS - Schedule of Fair Value of Fixed Maturity Investments Trading (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Total fixed maturity investments trading $ 21,309,460 $ 20,877,108
U.S. treasuries    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 9,793,911 10,060,203
Corporate    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 7,064,030 6,499,075
Residential mortgage-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 1,616,444 1,420,362
Asset-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 1,428,513 1,491,695
Agencies    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 594,522 489,117
Non-U.S. government    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 495,426 483,576
Commercial mortgage-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading $ 316,614 $ 433,080