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INVESTMENTS (Contractual Maturities) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 584,411 | $ 436,287
Due after one year through five years | 4,361,986 | 4,165,696
Due after five years through ten years | 2,324,428 | 2,344,859
Due after ten years | 236,654 | 258,654
Total fixed maturities with a single maturity date | 7,507,479 | 7,205,496
Amortized Cost, Total | 11,480,507 | 11,566,930
Fair value |  |
Due in one year or less | 593,485 | 444,527
Due after one year through five years | 4,482,143 | 4,335,219
Due after five years through ten years | 2,363,912 | 2,489,050
Due after ten years | 236,398 | 273,025
Total fixed maturities with a single maturity date | 7,675,938 | 7,541,821
Fair value | $ 11,728,611 | $ 12,041,799
% of Total fair value |  |
Due in one year or less | 5.00% | 3.60%
Due after one year through five years | 38.20% | 36.00%
Due after five years through ten years | 20.20% | 20.70%
Due after ten years | 2.00% | 2.30%
Fixed maturities with a single maturity date | 65.40% | 62.60%
Total | 100.00% | 100.00%
Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,186,277 | $ 1,244,727
Amortized Cost, Total | 1,186,277 | 1,244,727
Fair value |  |
Fixed maturities without a single maturity date | 1,208,494 | 1,286,209
Fair value | $ 1,208,494 | $ 1,286,209
% of Total fair value |  |
Fixed maturities without a single maturity date | 10.30% | 10.70%
CMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,227,004 | $ 1,268,273
Amortized Cost, Total | 1,227,004 | 1,268,273
Fair value |  |
Fixed maturities without a single maturity date | 1,274,049 | 1,353,587
Fair value | $ 1,274,049 | $ 1,353,587
% of Total fair value |  |
Fixed maturities without a single maturity date | 10.90% | 11.20%
Non-agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 163,617 | $ 136,198
Amortized Cost, Total | 163,617 | 136,198
Fair value |  |
Fixed maturities without a single maturity date | 167,169 | 140,104
Fair value | $ 167,169 | $ 140,104
% of Total fair value |  |
Fixed maturities without a single maturity date | 1.40% | 1.20%
ABS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,396,130 | $ 1,712,236
Amortized Cost, Total | 1,396,130 | 1,712,236
Fair value |  |
Fixed maturities without a single maturity date | 1,402,961 | 1,720,078
Fair value | $ 1,402,961 | $ 1,720,078
% of Total fair value |  |
Fixed maturities without a single maturity date | 12.00% | 14.30%

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