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INVESTMENTS - Schedule of Contractual Maturities of Fixed Maturity Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Amortized  Cost    
Due in less than one year $ 561,262 $ 587,720
Due after one through five years 11,305,216 11,439,510
Due after five through ten years 5,921,030 5,182,667
Due after ten years 320,954 307,392
Amortized  Cost 21,519,144 20,872,450
Fair Value    
Due in less than one year 556,795 582,519
Due after one through five years 11,229,683 11,468,263
Due after five through ten years 5,863,512 5,188,716
Due after ten years 297,899 292,473
Fixed maturity investments trading 21,309,460 20,877,108
Mortgage-backed    
Amortized  Cost    
Amortized  Cost 1,985,128 1,864,520
Fair Value    
Fixed maturity investments trading 1,933,058 1,853,442
Asset-backed    
Amortized  Cost    
Amortized  Cost 1,425,554 1,490,641
Fair Value    
Fixed maturity investments trading $ 1,428,513 $ 1,491,695