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INVESTMENTS (Contractual Maturities) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Due in one year or less (amortized cost) | $ 388,837 | $ 430,390
Due after one year through five years (amortized cost) | 5,169,170 | 4,751,064
Due after five years through ten years (amortized cost) | 1,921,131 | 1,762,452
Due after ten years (amortized cost) | 388,275 | 210,133
Total fixed maturities with a single maturity date (amortized cost) | 7,867,413 | 7,154,039
Amortized cost | 12,343,774 | 11,616,312
Due in one year or less (fair value) | 388,997 | 426,142
Due after one year through five years (fair value) | 5,237,935 | 4,691,263
Due after five years through ten years (fair value) | 1,967,360 | 1,697,737
Due after ten years (fair value) | 400,732 | 206,077
Total fixed maturities with a single maturity date (fair value) | 7,995,024 | 7,021,219
Fair Value | $ 12,522,955 | $ 11,435,347
Due in one year or less (% of total fair value) | 3.10% | 3.70%
Due after one year through five years (% of total fair value) | 41.80% | 41.00%
Due after five years through ten years (% of total fair value) | 15.70% | 14.80%
Due after ten years (% of total fair value) | 3.20% | 1.80%
Fixed maturities with a single maturity date (% of total fair value) | 63.80% | 61.30%
Total | 100.00% | 100.00%
Agency RMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 1,669,160 | $ 1,666,684
Amortized cost | 1,669,160 | 1,666,684
Fixed maturities without a single maturity date (fair value) | 1,686,912 | 1,643,308
Fair Value | $ 1,686,912 | $ 1,643,308
Fixed maturities without a single maturity date (% of total fair value) | 13.50% | 14.40%
CMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 1,150,370 | $ 1,103,507
Amortized cost | 1,150,370 | 1,103,507
Fixed maturities without a single maturity date (fair value) | 1,184,268 | 1,092,530
Fair Value | $ 1,184,268 | $ 1,092,530
Fixed maturities without a single maturity date (% of total fair value) | 9.50% | 9.60%
Non-Agency RMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 55,985 | $ 40,732
Amortized cost | 55,985 | 40,732
Fixed maturities without a single maturity date (fair value) | 55,980 | 40,687
Fair Value | $ 55,980 | $ 40,687
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) | $ 1,600,846 | $ 1,651,350
Amortized cost | 1,600,846 | 1,651,350
Fixed maturities without a single maturity date (fair value) | 1,600,771 | 1,637,603
Fair Value | $ 1,600,771 | $ 1,637,603
Fixed maturities without a single maturity date (% of total fair value) | 12.80% | 14.30%

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