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INVESTMENTS - Schedule of Contractual Maturities of Fixed Maturity Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Amortized  Cost    
Due in less than one year $ 1,459,627 $ 1,374,089
Due after one through five years 12,585,181 12,139,153
Due after five through ten years 5,135,454 6,339,563
Due after ten years 362,812 387,413
Amortized  Cost 23,554,856 23,750,540
Fair Value    
Due in less than one year 1,462,105 1,373,838
Due after one through five years 12,742,119 12,131,114
Due after five through ten years 5,216,558 6,246,506
Due after ten years 344,002 355,156
Fixed maturity investments trading 23,772,222 23,562,514
Mortgage-backed    
Amortized  Cost    
Amortized  Cost 2,559,465 2,094,190
Fair Value    
Fixed maturity investments trading 2,551,371 2,033,507
Asset-backed    
Amortized  Cost    
Amortized  Cost 1,452,317 1,416,132
Fair Value    
Fixed maturity investments trading $ 1,456,067 $ 1,422,393