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INVESTMENTS (DETAILS 2) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Schedule Of Available For Sale Securities [Line Items] |  |
Due in one year or less (amortized cost) | $ 295,599 | $ 291,368
Due after one year through five years (amortized cost) | 3,994,127 | 4,217,515
Due after five years through ten years (amortized cost) | 2,263,573 | 2,263,684
Due after ten years (amortized cost) | 328,419 | 312,431
Total fixed maturities with a single maturity date (amortized cost) | 6,881,718 | 7,084,998
Total (amortized cost) | 11,812,782 | 11,897,639
Due in one year or less (fair value) | 291,510 | 289,571
Due after one year through five years (fair value) | 3,985,100 | 4,142,802
Due after five years through ten years (fair value) | 2,264,238 | 2,181,525
Due after ten years (fair value) | 331,063 | 301,039
Total fixed maturities with a single maturity date (fair value) | 6,871,911 | 6,914,937
Fair Value (fixed maturities) | $ 11,838,068 | $ 11,719,749
Due in one year or less (% of total fair value) | 2.50% | 2.50%
Due after one year through five years (% of total fair value) | 33.70% | 35.30%
Due after five years through ten years (% of total fair value) | 19.10% | 18.60%
Due after ten years (% of total fair value) | 2.80% | 2.60%
Fixed maturities with a single maturity date (% of total fair value) | 58.10% | 59.00%
Total | 100.00% | 100.00%
Agency RMBS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 2,377,262 | $ 2,236,138
Total (amortized cost) | 2,377,262 | 2,236,138
Fixed maturities without a single maturity date (fair value) | 2,421,301 | 2,249,236
Fair Value (fixed maturities) | $ 2,421,301 | $ 2,249,236
Fixed maturities without a single maturity date (% of total fair value) | 20.50% | 19.20%
CMBS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 1,099,346 | $ 1,088,595
Total (amortized cost) | 1,099,346 | 1,088,595
Fixed maturities without a single maturity date (fair value) | 1,106,684 | 1,083,298
Fair Value (fixed maturities) | $ 1,106,684 | $ 1,083,298
Fixed maturities without a single maturity date (% of total fair value) | 9.30% | 9.20%
Non-Agency RMBS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 94,704 | $ 99,989
Total (amortized cost) | 94,704 | 99,989
Fixed maturities without a single maturity date (fair value) | 95,022 | 101,008
Fair Value (fixed maturities) | $ 95,022 | $ 101,008
Fixed maturities without a single maturity date (% of total fair value) | 0.80% | 0.90%
ABS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fixed maturities without a single maturity date (amortized cost) | $ 1,359,752 | $ 1,387,919
Total (amortized cost) | 1,359,752 | 1,387,919
Fixed maturities without a single maturity date (fair value) | 1,343,150 | 1,371,270
Fair Value (fixed maturities) | $ 1,343,150 | $ 1,371,270
Fixed maturities without a single maturity date (% of total fair value) | 11.30% | 11.70%

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