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INVESTMENTS - Contractual Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Amortized cost |  |
Due in one year or less | $ 576,989 | $ 422,039
Due after one year through five years | 5,400,687 | 5,349,123
Due after five years through ten years | 2,171,234 | 2,192,344
Due after ten years | 174,926 | 234,046
Total fixed maturities with a single maturity date | 8,323,836 | 8,197,552
Amortized cost, Total | 12,264,498 | 12,176,473
Fair value |  |
Due in one year or less | 563,123 | 409,972
Due after one year through five years | 5,204,250 | 5,078,273
Due after five years through ten years | 1,974,369 | 1,919,450
Due after ten years | 163,281 | 205,575
Total fixed maturities with a single maturity date | 7,905,023 | 7,613,270
Fair value, Total | $ 11,627,555 | $ 11,326,894
% of Total fair value |  |
Due in one year or less | 4.90% | 3.70%
Due after one year through five years (as a percent) | 44.80% | 44.80%
Due after five years through ten years (as a percent) | 17.00% | 16.90%
Due after ten years (as a percent) | 1.40% | 1.80%
Fixed maturities with a single maturity date (as a percent) | 68.10% | 67.20%
Total (as a percent) | 100.00% | 100.00%
Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,344,187 | $ 1,297,423
Amortized cost, Total | 1,344,187 | 1,297,423
Fair value |  |
Fixed maturities without a single maturity date | 1,272,161 | 1,202,785
Fair value, Total | $ 1,272,161 | $ 1,202,785
% of Total fair value |  |
Fixed maturities without a single maturity date (as a percent) | 10.90% | 10.60%
CMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 996,699 | $ 1,029,863
Amortized cost, Total | 996,699 | 1,029,863
Fair value |  |
Fixed maturities without a single maturity date | 923,503 | 947,778
Fair value, Total | $ 923,503 | $ 947,778
% of Total fair value |  |
Fixed maturities without a single maturity date (as a percent) | 7.90% | 8.40%
Non-agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 145,288 | $ 151,907
Amortized cost, Total | 145,288 | 151,907
Fair value |  |
Fixed maturities without a single maturity date | 129,485 | 133,534
Fair value, Total | $ 129,485 | $ 133,534
% of Total fair value |  |
Fixed maturities without a single maturity date (as a percent) | 1.10% | 1.20%
ABS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,454,488 | $ 1,499,728
Amortized cost, Total | 1,454,488 | 1,499,728
Fair value |  |
Fixed maturities without a single maturity date | 1,397,383 | 1,429,527
Fair value, Total | $ 1,397,383 | $ 1,429,527
% of Total fair value |  |
Fixed maturities without a single maturity date (as a percent) | 12.00% | 12.60%
Held-to-maturity securities without a single maturity date | $ 632,000 | $ 613,000
Corporate debt |  |
Amortized cost |  |
Amortized cost, Total | 4,619,198 | 4,680,798
Fair value |  |
Fair value, Total | 4,297,212 | 4,255,556
% of Total fair value |  |
Held-to-maturity securities with maturity after three years through 10 years | 81,000 | 81,000
Held-to-maturity securities with maturity after ten years | $ 4,000 | $ 4,000
Corporate debt | Minimum |  |
% of Total fair value |  |
Debt securities, held-to-maturity, maturity period | 3 years |
Corporate debt | Maximum |  |
% of Total fair value |  |
Debt securities, held-to-maturity, maturity period | 10 years |

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