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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

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