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INVESTMENTS (Contractual Maturities) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 331,379 | $ 430,390
Due after one year through five years | 4,980,949 | 4,751,064
Due after five years through ten years | 2,107,695 | 1,762,452
Due after ten years | 397,393 | 210,133
Total fixed maturities with a single maturity date | 7,817,416 | 7,154,039
Amortized cost | 12,407,704 | 11,616,312
Fair value |  |
Due in one year or less | 330,584 | 426,142
Due after one year through five years | 5,037,089 | 4,691,263
Due after five years through ten years | 2,173,611 | 1,697,737
Due after ten years | 413,812 | 206,077
Total fixed maturities with a single maturity date | 7,955,096 | 7,021,219
Fair value | $ 12,616,241 | $ 11,435,347
% of Total fair value |  |
Due in one year or less | 2.60% | 3.70%
Due after one year through five years | 39.90% | 41.00%
Due after five years through ten years | 17.20% | 14.80%
Due after ten years | 3.30% | 1.80%
Fixed maturities with a single maturity date | 63.00% | 61.30%
Total | 100.00% | 100.00%
Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,609,193 | $ 1,666,684
Amortized cost | 1,609,193 | 1,666,684
Fair value |  |
Fixed maturities without a single maturity date | 1,632,768 | 1,643,308
Fair value | $ 1,632,768 | $ 1,643,308
% of Total fair value |  |
Fixed maturities without a single maturity date | 12.90% | 14.40%
CMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,321,029 | $ 1,103,507
Amortized cost | 1,321,029 | 1,103,507
Fair value |  |
Fixed maturities without a single maturity date | 1,368,890 | 1,092,530
Fair value | $ 1,368,890 | $ 1,092,530
% of Total fair value |  |
Fixed maturities without a single maturity date | 10.90% | 9.60%
Non-Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 59,308 | $ 40,732
Amortized cost | 59,308 | 40,732
Fair value |  |
Fixed maturities without a single maturity date | 58,952 | 40,687
Fair value | $ 58,952 | $ 40,687
% of Total fair value |  |
Fixed maturities without a single maturity date | 0.50% | 0.40%
ABS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,600,758 | $ 1,651,350
Amortized cost | 1,600,758 | 1,651,350
Fair value |  |
Fixed maturities without a single maturity date | 1,600,535 | 1,637,603
Fair value | $ 1,600,535 | $ 1,637,603
% of Total fair value |  |
Fixed maturities without a single maturity date | 12.70% | 14.30%

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