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INVESTMENTS (Contractual Maturities) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Due in one year or less (amortized cost) | $ 513,226 | $ 486,659
Due after one year through five years (amortized cost) | 4,642,999 | 4,906,207
Due after five years through ten years (amortized cost) | 1,942,501 | 2,338,964
Due after ten years (amortized cost) | 193,822 | 209,357
Total fixed maturities with a single maturity date (amortized cost) | 7,292,548 | 7,941,187
Total (amortized cost) | 11,898,060 | 12,611,219
Due in one year or less (fair value) | 507,980 | 484,663
Due after one year through five years (fair value) | 4,626,323 | 4,912,189
Due after five years through ten years (fair value) | 1,911,664 | 2,350,433
Due after ten years (fair value) | 201,868 | 218,729
Total fixed maturities with a single maturity date (fair value) | 7,247,835 | 7,966,014
Fair Value (fixed maturities) | $ 11,801,396 | $ 12,622,006
Due in one year or less (% of total fair value) | 4.30% | 3.80%
Due after one year through five years (% of total fair value) | 39.20% | 38.90%
Due after five years through ten years (% of total fair value) | 16.20% | 18.60%
Due after ten years (% of total fair value) | 1.70% | 1.70%
Fixed maturities with a single maturity date (% of total fair value) | 61.40% | 63.00%
Total | 100.00% | 100.00%
Agency RMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 1,956,394 | $ 2,414,720
Total (amortized cost) | 1,956,394 | 2,414,720
Fixed maturities without a single maturity date (fair value) | 1,914,845 | 2,395,152
Fair Value (fixed maturities) | $ 1,914,845 | $ 2,395,152
Fixed maturities without a single maturity date (% of total fair value) | 16.20% | 19.00%
CMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 1,042,704 | $ 776,715
Total (amortized cost) | 1,042,704 | 776,715
Fixed maturities without a single maturity date (fair value) | 1,030,621 | 777,728
Fair Value (fixed maturities) | $ 1,030,621 | $ 777,728
Fixed maturities without a single maturity date (% of total fair value) | 8.70% | 6.20%
Non-Agency RMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 39,930 | $ 45,713
Total (amortized cost) | 39,930 | 45,713
Fixed maturities without a single maturity date (fair value) | 41,397 | 46,831
Fair Value (fixed maturities) | $ 41,397 | $ 46,831
Fixed maturities without a single maturity date (% of total fair value) | 0.40% | 0.40%
ABS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 1,566,484 | $ 1,432,884
Total (amortized cost) | 1,566,484 | 1,432,884
Fixed maturities without a single maturity date (fair value) | 1,566,698 | 1,436,281
Fair Value (fixed maturities) | $ 1,566,698 | $ 1,436,281
Fixed maturities without a single maturity date (% of total fair value) | 13.30% | 11.40%

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