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INVESTMENTS - Contractual maturities of fixed maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 430,390 | $ 486,659
Due after one year through five years | 4,751,064 | 4,906,207
Due after five years through ten years | 1,762,452 | 2,338,964
Due after ten years | 210,133 | 209,357
Total fixed maturities with a single maturity date (amortized cost) | 7,154,039 | 7,941,187
Total | 11,616,312 | 12,611,219
Fair value |  |
Due in one year or less | 426,142 | 484,663
Due after one year through five years | 4,691,263 | 4,912,189
Due after five years through ten years | 1,697,737 | 2,350,433
Due after ten years | 206,077 | 218,729
Total fixed maturities with a single maturity date (fair value) | 7,021,219 | 7,966,014
Fair value | $ 11,435,347 | $ 12,622,006
% of Total fair value |  |
Due in one year or less | 3.70% | 3.80%
Due after one year through five years | 41.00% | 38.90%
Due after five years through ten years | 14.80% | 18.60%
Due after ten years | 1.80% | 1.70%
Fixed maturities with a single maturity date (% of total fair value) | 61.30% | 63.00%
Total | 100.00% | 100.00%
Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,666,684 | $ 2,414,720
Total | 1,666,684 | 2,414,720
Fair value |  |
Fixed maturities without a single maturity date (fair value) | 1,643,308 | 2,395,152
Fair value | $ 1,643,308 | $ 2,395,152
% of Total fair value |  |
Fixed maturities without a single maturity date (% of total fair value) | 14.40% | 19.00%
CMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,103,507 | $ 776,715
Total | 1,103,507 | 776,715
Fair value |  |
Fixed maturities without a single maturity date (fair value) | 1,092,530 | 777,728
Fair value | $ 1,092,530 | $ 777,728
% of Total fair value |  |
Fixed maturities without a single maturity date (% of total fair value) | 9.60% | 6.20%
Non-Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 40,732 | $ 45,713
Total | 40,732 | 45,713
Fair value |  |
Fixed maturities without a single maturity date (fair value) | 40,687 | 46,831
Fair value | $ 40,687 | $ 46,831
% of Total fair value |  |
Fixed maturities without a single maturity date (% of total fair value) | 0.40% | 0.40%
ABS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,651,350 | $ 1,432,884
Total | 1,651,350 | 1,432,884
Fair value |  |
Fixed maturities without a single maturity date (fair value) | 1,637,603 | 1,436,281
Fair value | $ 1,637,603 | $ 1,436,281
% of Total fair value |  |
Fixed maturities without a single maturity date (% of total fair value) | 14.30% | 11.40%

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