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INVESTMENTS - Contractual Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 500,557 | $ 503,716
Due after one year through five years | 4,702,609 | 4,878,151
Due after five years through ten years | 2,440,295 | 2,478,542
Due after ten years | 287,722 | 277,756
Total fixed maturities with a single maturity date | 7,931,183 | 8,138,165
Amortized cost, Total | 11,840,101 | 12,241,782
Fair value |  |
Due in one year or less | 498,580 | 505,602
Due after one year through five years | 4,583,979 | 4,908,640
Due after five years through ten years | 2,300,432 | 2,488,478
Due after ten years | 268,918 | 279,056
Total fixed maturities with a single maturity date | 7,651,909 | 8,181,776
Fair value | $ 11,456,024 | $ 12,313,200
% of Total fair value |  |
Due in one year or less (as a percent) | 4.40% | 4.10%
Due after one year through five years (as a percent) | 40.00% | 39.90%
Due after five years through ten years (as a percent) | 20.10% | 20.20%
Due after ten years (as a percent) | 2.30% | 2.30%
Fixed maturities with a single maturity date (as a percent) | 66.80% | 66.50%
Total (as a percent) | 100.00% | 100.00%
Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 972,244 | $ 1,065,973
Amortized cost, Total | 972,244 | 1,065,973
Fair value |  |
Fixed maturities without a single maturity date | 935,837 | 1,074,589
Fair value | $ 935,837 | $ 1,074,589
% of Total fair value |  |
Fixed maturities without a single maturity date (as a percent) | 8.20% | 8.70%
CMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,188,811 | $ 1,223,051
Amortized cost, Total | 1,188,811 | 1,223,051
Fair value |  |
Fixed maturities without a single maturity date | 1,159,385 | 1,248,191
Fair value | $ 1,159,385 | $ 1,248,191
% of Total fair value |  |
Fixed maturities without a single maturity date (as a percent) | 10.10% | 10.10%
Non-agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 181,171 | $ 185,854
Amortized cost, Total | 181,171 | 185,854
Fair value |  |
Fixed maturities without a single maturity date | 174,888 | 186,164
Fair value | $ 174,888 | $ 186,164
% of Total fair value |  |
Fixed maturities without a single maturity date (as a percent) | 1.50% | 1.50%
ABS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,566,692 | $ 1,628,739
Amortized cost, Total | 1,566,692 | 1,628,739
Fair value |  |
Fixed maturities without a single maturity date | 1,534,005 | 1,622,480
Fair value | $ 1,534,005 | $ 1,622,480
% of Total fair value |  |
Fixed maturities without a single maturity date (as a percent) | 13.40% | 13.20%
Held-to-maturity securities without a single maturity date | $ 438,000 | $ 408,000
Corporate debt |  |
Amortized cost |  |
Amortized cost, Total | 4,658,246 | 4,446,585
Fair value |  |
Fair value | 4,473,551 | 4,495,312
% of Total fair value |  |
Held-to-maturity securities with maturity after three years through 10 years | 51,000 | 34,000
Held-to-maturity securities with maturity after ten years | $ 4,000 | $ 4,000

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