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INVESTMENTS - Schedule of Contractual Maturities of Fixed Maturity Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Amortized  Cost    
Due in less than one year $ 1,374,089 $ 587,720
Due after one through five years 12,139,153 11,439,510
Due after five through ten years 6,339,563 5,182,667
Due after ten years 387,413 307,392
Amortized cost 23,750,540 20,872,450
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]    
Due in less than one year 1,373,838 582,519
Due after one through five years 12,131,114 11,468,263
Due after five through ten years 6,246,506 5,188,716
Due after ten years 355,156 292,473
Fixed maturity investments trading 23,562,514 20,877,108
Mortgage-backed    
Amortized  Cost    
Amortized cost 2,094,190 1,864,520
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]    
Fixed maturity investments trading 2,033,507 1,853,442
Asset-backed    
Amortized  Cost    
Amortized cost 1,416,132 1,490,641
Debt Securities, Trading, and Equity Securities, FV-NI [Abstract]    
Fixed maturity investments trading $ 1,422,393 $ 1,491,695