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INVESTMENTS - Schedule of Contractual Maturities of Fixed Maturity Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Amortized  Cost    
Due in less than one year $ 1,224,238 $ 587,720
Due after one through five years 12,783,659 11,439,510
Due after five through ten years 5,993,586 5,182,667
Due after ten years 406,699 307,392
Amortized  Cost 23,927,291 20,872,450
Fair Value    
Due in less than one year 1,226,745 582,519
Due after one through five years 12,971,037 11,468,263
Due after five through ten years 6,155,650 5,188,716
Due after ten years 398,342 292,473
Fixed maturity investments trading 24,287,185 20,877,108
Mortgage-backed    
Amortized  Cost    
Amortized  Cost 2,085,663 1,864,520
Fair Value    
Fixed maturity investments trading 2,095,217 1,853,442
Asset-backed    
Amortized  Cost    
Amortized  Cost 1,433,446 1,490,641
Fair Value    
Fixed maturity investments trading $ 1,440,194 $ 1,491,695