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INVESTMENTS - Summary of Contractual Maturities of Fixed Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 422,039 | $ 503,716
Due after one year through five years | 5,349,123 | 4,878,151
Due after five years through ten years | 2,192,344 | 2,478,542
Due after ten years | 234,046 | 277,756
Total fixed maturities with a single maturity date (amortized cost) | 8,197,552 | 8,138,165
Amortized cost | 12,176,473 | 12,241,782
Fair value |  |
Due in one year or less | 409,972 | 505,602
Due after one year through five years | 5,078,273 | 4,908,640
Due after five years through ten years | 1,919,450 | 2,488,478
Due after ten years | 205,575 | 279,056
Total fixed maturities with a single maturity date (fair value) | 7,613,270 | 8,181,776
Fair value | $ 11,326,894 | $ 12,313,200
% of Total fair value |  |
Due in one year or less | 3.70% | 4.10%
Due after one year through five years | 44.80% | 39.90%
Due after five years through ten years | 16.90% | 20.20%
Due after ten years | 1.80% | 2.30%
Fixed maturities with a single maturity date (% of total fair value) | 67.20% | 66.50%
Total | 100.00% | 100.00%
Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,297,423 | $ 1,065,973
Amortized cost | 1,297,423 | 1,065,973
Fair value |  |
Fixed maturities without a single maturity date (fair value) | 1,202,785 | 1,074,589
Fair value | $ 1,202,785 | $ 1,074,589
% of Total fair value |  |
Fixed maturities without a single maturity date (% of total fair value) | 10.60% | 8.70%
CMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,029,863 | $ 1,223,051
Amortized cost | 1,029,863 | 1,223,051
Fair value |  |
Fixed maturities without a single maturity date (fair value) | 947,778 | 1,248,191
Fair value | $ 947,778 | $ 1,248,191
% of Total fair value |  |
Fixed maturities without a single maturity date (% of total fair value) | 8.40% | 10.10%
Non-agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 151,907 | $ 185,854
Amortized cost | 151,907 | 185,854
Fair value |  |
Fixed maturities without a single maturity date (fair value) | 133,534 | 186,164
Fair value | $ 133,534 | $ 186,164
% of Total fair value |  |
Fixed maturities without a single maturity date (% of total fair value) | 1.20% | 1.50%
ABS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,499,728 | $ 1,628,739
Amortized cost | 1,499,728 | 1,628,739
Fair value |  |
Fixed maturities without a single maturity date (fair value) | 1,429,527 | 1,622,480
Fair value | $ 1,429,527 | $ 1,622,480
% of Total fair value |  |
Fixed maturities without a single maturity date (% of total fair value) | 12.60% | 13.20%

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