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INVESTMENTS - Contractual maturities of fixed maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 438,881 | $ 430,390
Due after one year through five years | 4,810,202 | 4,751,064
Due after five years through ten years | 2,091,486 | 1,762,452
Due after ten years | 327,444 | 210,133
Total fixed maturities with a single maturity date (amortized cost) | 7,668,013 | 7,154,039
Total | 12,263,240 | 11,616,312
Fair value |  |
Due in one year or less | 443,228 | 426,142
Due after one year through five years | 4,884,837 | 4,691,263
Due after five years through ten years | 2,157,157 | 1,697,737
Due after ten years | 341,732 | 206,077
Total fixed maturities with a single maturity date (fair value) | 7,826,954 | 7,021,219
Fair value | $ 12,468,205 | $ 11,435,347
% of Total fair value |  |
Due in one year or less | 3.60% | 3.70%
Due after one year through five years | 39.20% | 41.00%
Due after five years through ten years | 17.30% | 14.80%
Due after ten years | 2.70% | 1.80%
Fixed maturities with a single maturity date (% of total fair value) | 62.80% | 61.30%
Total | 100.00% | 100.00%
Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,570,823 | $ 1,666,684
Total | 1,570,823 | 1,666,684
Fair value |  |
Fixed maturities without a single maturity date (fair value) | 1,592,584 | 1,643,308
Fair value | $ 1,592,584 | $ 1,643,308
% of Total fair value |  |
Fixed maturities without a single maturity date (% of total fair value) | 12.80% | 14.40%
CMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,340,156 | $ 1,103,507
Total | 1,340,156 | 1,103,507
Fair value |  |
Fixed maturities without a single maturity date (fair value) | 1,365,052 | 1,092,530
Fair value | $ 1,365,052 | $ 1,092,530
% of Total fair value |  |
Fixed maturities without a single maturity date (% of total fair value) | 10.90% | 9.60%
Non-Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 84,381 | $ 40,732
Total | 84,381 | 40,732
Fair value |  |
Fixed maturities without a single maturity date (fair value) | 84,922 | 40,687
Fair value | $ 84,922 | $ 40,687
% of Total fair value |  |
Fixed maturities without a single maturity date (% of total fair value) | 0.70% | 0.40%
ABS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,599,867 | $ 1,651,350
Total | 1,599,867 | 1,651,350
Fair value |  |
Fixed maturities without a single maturity date (fair value) | 1,598,693 | 1,637,603
Fair value | $ 1,598,693 | $ 1,637,603
% of Total fair value |  |
Fixed maturities without a single maturity date (% of total fair value) | 12.80% | 14.30%

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