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INVESTMENTS (Contractual Maturities) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 367,208 | $ 438,881
Due after one year through five years | 4,318,770 | 4,810,202
Due after five years through ten years | 2,524,796 | 2,091,486
Due after ten years | 257,977 | 327,444
Total fixed maturities with a single maturity date | 7,468,751 | 7,668,013
Amortized Cost, Total | 12,201,832 | 12,263,240
Fair value |  |
Due in one year or less | 371,864 | 443,228
Due after one year through five years | 4,446,778 | 4,884,837
Due after five years through ten years | 2,660,506 | 2,157,157
Due after ten years | 266,544 | 341,732
Total fixed maturities with a single maturity date | 7,745,692 | 7,826,954
Fair value | $ 12,609,241 | $ 12,468,205
% of Total fair value |  |
Due in one year or less | 2.80% | 3.60%
Due after one year through five years | 35.30% | 39.20%
Due after five years through ten years | 21.10% | 17.30%
Due after ten years | 2.10% | 2.70%
Fixed maturities with a single maturity date | 61.30% | 62.80%
Total | 100.00% | 100.00%
Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,630,014 | $ 1,570,823
Amortized Cost, Total | 1,630,014 | 1,570,823
Fair value |  |
Fixed maturities without a single maturity date | 1,677,106 | 1,592,584
Fair value | $ 1,677,106 | $ 1,592,584
% of Total fair value |  |
Fixed maturities without a single maturity date | 13.30% | 12.80%
CMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,291,291 | $ 1,340,156
Amortized Cost, Total | 1,291,291 | 1,340,156
Fair value |  |
Fixed maturities without a single maturity date | 1,380,738 | 1,365,052
Fair value | $ 1,380,738 | $ 1,365,052
% of Total fair value |  |
Fixed maturities without a single maturity date | 11.00% | 10.90%
Non-agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 131,937 | $ 84,381
Amortized Cost, Total | 131,937 | 84,381
Fair value |  |
Fixed maturities without a single maturity date | 133,530 | 84,922
Fair value | $ 133,530 | $ 84,922
% of Total fair value |  |
Fixed maturities without a single maturity date | 1.10% | 0.70%
ABS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,679,839 | $ 1,599,867
Amortized Cost, Total | 1,679,839 | 1,599,867
Fair value |  |
Fixed maturities without a single maturity date | 1,672,175 | 1,598,693
Fair value | $ 1,672,175 | $ 1,598,693
% of Total fair value |  |
Fixed maturities without a single maturity date | 13.30% | 12.80%

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