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INVESTMENTS (Contractual Maturities) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost |  |
Due in one year or less | $ 524,297 | $ 436,287
Due after one year through five years | 4,651,630 | 4,165,696
Due after five years through ten years | 2,435,663 | 2,344,859
Due after ten years | 209,067 | 258,654
Total fixed maturities with a single maturity date | 7,820,657 | 7,205,496
Amortized Cost, Total | 11,638,359 | 11,566,930
Fair value |  |
Due in one year or less | 531,246 | 444,527
Due after one year through five years | 4,761,285 | 4,335,219
Due after five years through ten years | 2,495,245 | 2,489,050
Due after ten years | 214,248 | 273,025
Total fixed maturities with a single maturity date | 8,002,024 | 7,541,821
Fair value | $ 11,898,300 | $ 12,041,799
% of Total fair value |  |
Due in one year or less | 4.50% | 3.60%
Due after one year through five years | 40.00% | 36.00%
Due after five years through ten years | 21.00% | 20.70%
Due after ten years | 1.80% | 2.30%
Fixed maturities with a single maturity date | 67.30% | 62.60%
Total | 100.00% | 100.00%
Agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,022,259 | $ 1,244,727
Amortized Cost, Total | 1,022,259 | 1,244,727
Fair value |  |
Fixed maturities without a single maturity date | 1,044,556 | 1,286,209
Fair value | $ 1,044,556 | $ 1,286,209
% of Total fair value |  |
Fixed maturities without a single maturity date | 8.80% | 10.70%
CMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,097,457 | $ 1,268,273
Amortized Cost, Total | 1,097,457 | 1,268,273
Fair value |  |
Fixed maturities without a single maturity date | 1,144,592 | 1,353,587
Fair value | $ 1,144,592 | $ 1,353,587
% of Total fair value |  |
Fixed maturities without a single maturity date | 9.60% | 11.20%
Non-agency RMBS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 204,437 | $ 136,198
Amortized Cost, Total | 204,437 | 136,198
Fair value |  |
Fixed maturities without a single maturity date | 207,489 | 140,104
Fair value | $ 207,489 | $ 140,104
% of Total fair value |  |
Fixed maturities without a single maturity date | 1.70% | 1.20%
ABS |  |
Amortized cost |  |
Fixed maturities without a single maturity date | $ 1,493,549 | $ 1,712,236
Amortized Cost, Total | 1,493,549 | 1,712,236
Fair value |  |
Fixed maturities without a single maturity date | 1,499,639 | 1,720,078
Fair value | $ 1,499,639 | $ 1,720,078
% of Total fair value |  |
Fixed maturities without a single maturity date | 12.60% | 14.30%

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