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INVESTMENTS (Contractual Maturities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Due in one year or less (amortized cost) | $ 496,968 | $ 486,659
Due after one year through five years (amortized cost) | 4,926,538 | 4,906,207
Due after five years through ten years (amortized cost) | 1,821,059 | 2,338,964
Due after ten years (amortized cost) | 215,741 | 209,357
Total fixed maturities with a single maturity date (amortized cost) | 7,460,306 | 7,941,187
Amortized Cost | 11,941,555 | 12,611,219
Due in one year or less (fair value) | 492,752 | 484,663
Due after one year through five years (fair value) | 4,881,185 | 4,912,189
Due after five years through ten years (fair value) | 1,774,813 | 2,350,433
Due after ten years (fair value) | 215,164 | 218,729
Total fixed maturities with a single maturity date (fair value) | 7,363,914 | 7,966,014
Fair Value | $ 11,767,697 | $ 12,622,006
Due in one year or less (% of total fair value) | 4.10% | 3.80%
Due after one year through five years (% of total fair value) | 41.50% | 38.90%
Due after five years through ten years (% of total fair value) | 15.10% | 18.60%
Due after ten years (% of total fair value) | 1.80% | 1.70%
Fixed maturities with a single maturity date (% of total fair value) | 62.50% | 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) | $ 1,688,977 | $ 2,414,720
Amortized Cost | 1,688,977 | 2,414,720
Fixed maturities without a single maturity date (fair value) | 1,639,231 | 2,395,152
Fair Value | $ 1,639,231 | $ 2,395,152
Fixed maturities without a single maturity date (% of total fair value) | 13.90% | 19.00%
CMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 1,099,728 | $ 776,715
Amortized Cost | 1,099,728 | 776,715
Fixed maturities without a single maturity date (fair value) | 1,076,955 | 777,728
Fair Value | $ 1,076,955 | $ 777,728
Fixed maturities without a single maturity date (% of total fair value) | 9.20% | 6.20%
Non-Agency RMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 41,273 | $ 45,713
Amortized Cost | 41,273 | 45,713
Fixed maturities without a single maturity date (fair value) | 41,786 | 46,831
Fair Value | $ 41,786 | $ 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) | $ 1,651,271 | $ 1,432,884
Amortized Cost | 1,651,271 | 1,432,884
Fixed maturities without a single maturity date (fair value) | 1,645,811 | 1,436,281
Fair Value | $ 1,645,811 | $ 1,436,281
Fixed maturities without a single maturity date (% of total fair value) | 14.00% | 11.40%

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