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INVESTMENTS - Contractual Maturities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 752,064 | $ 474,557
Due after one year through five years | 6,089,410 | 5,902,571
Due after five years through ten years | 2,408,029 | 2,064,619
Due after ten years | 238,425 | 157,653
Total fixed maturities with a single maturity date | 9,487,928 | 8,599,400
Amortized cost, total | 13,806,792 | 12,634,254
Fair value |  |
Due in one year or less | 748,123 | 463,789
Due after one year through five years | 6,132,217 | 5,790,493
Due after five years through ten years | 2,380,767 | 1,954,449
Due after ten years | 239,719 | 155,287
Total fixed maturities with a single maturity date | 9,500,826 | 8,364,018
Fair value, total | $ 13,768,193 | $ 12,234,742
% of Total fair value |  |
Due in one year or less (as a percent) | 5.50% | 3.60%
Due after one year through five years (as a percent) | 44.50% | 47.30%
Due after five years through ten years (as a percent) | 17.30% | 16.00%
Due after ten years (as a percent) | 1.70% | 1.30%
Fixed maturities with a single maturity date (as a percent) | 69.00% | 68.20%
Total (as a percent) | 100.00% | 100.00%
Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,764,991 | $ 1,706,204
Amortized cost, total | 1,764,991 | 1,706,204
Fair value |  |
Fixed maturities without a single maturity date | 1,747,063 | 1,634,661
Fair value, total | $ 1,747,063 | $ 1,634,661
% of Total fair value |  |
Fixed maturities without a single maturity date (as a percent) | 12.70% | 13.40%
CMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 839,795 | $ 897,553
Amortized cost, total | 839,795 | 897,553
Fair value |  |
Fixed maturities without a single maturity date | 810,757 | 839,696
Fair value, total | $ 810,757 | $ 839,696
% of Total fair value |  |
Fixed maturities without a single maturity date (as a percent) | 5.90% | 6.90%
Non-agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 132,009 | $ 165,910
Amortized cost, total | 132,009 | 165,910
Fair value |  |
Fixed maturities without a single maturity date | 124,445 | 153,396
Fair value, total | $ 124,445 | $ 153,396
% of Total fair value |  |
Fixed maturities without a single maturity date (as a percent) | 0.90% | 1.30%
ABS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,582,069 | $ 1,265,187
Amortized cost, total | 1,582,069 | 1,265,187
Fair value |  |
Fixed maturities without a single maturity date | 1,585,102 | 1,242,971
Fair value, total | $ 1,585,102 | $ 1,242,971
% of Total fair value |  |
Fixed maturities without a single maturity date (as a percent) | 11.50% | 10.20%

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