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INVESTMENTS (Fixed Maturities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fixed maturities |  |
Amortized cost | $ 11,834,207 | $ 11,616,312
Gross unrealized gains | 115,142 | 33,874
Gross unrealized losses | (74,831) | (214,839)
Fair value | 11,874,518 | 11,435,347
Non-credit OTTI in AOCI | (819) | (857)
U.S. government and agency |  |
Fixed maturities |  |
Amortized cost | 1,965,801 | 1,520,142
Gross unrealized gains | 12,365 | 4,232
Gross unrealized losses | (4,512) | (8,677)
Fair value | 1,973,654 | 1,515,697
Non-credit OTTI in AOCI | 0 | 0
Non-U.S. government |  |
Fixed maturities |  |
Amortized cost | 488,056 | 507,550
Gross unrealized gains | 6,448 | 1,586
Gross unrealized losses | (6,841) | (16,120)
Fair value | 487,663 | 493,016
Non-credit OTTI in AOCI | 0 | 0
Corporate debt |  |
Fixed maturities |  |
Amortized cost | 4,809,079 | 4,990,279
Gross unrealized gains | 62,910 | 15,086
Gross unrealized losses | (33,724) | (128,444)
Fair value | 4,838,265 | 4,876,921
Non-credit OTTI in AOCI | 0 | 0
Agency RMBS |  |
Fixed maturities |  |
Amortized cost | 1,708,610 | 1,666,684
Gross unrealized gains | 14,430 | 6,508
Gross unrealized losses | (17,078) | (29,884)
Fair value | 1,705,962 | 1,643,308
Non-credit OTTI in AOCI | 0 | 0
CMBS |  |
Fixed maturities |  |
Amortized cost | 1,040,474 | 1,103,507
Gross unrealized gains | 13,491 | 2,818
Gross unrealized losses | (1,825) | (13,795)
Fair value | 1,052,140 | 1,092,530
Non-credit OTTI in AOCI | 0 | 0
Non-Agency RMBS |  |
Fixed maturities |  |
Amortized cost | 47,125 | 40,732
Gross unrealized gains | 1,307 | 1,237
Gross unrealized losses | (1,021) | (1,282)
Fair value | 47,411 | 40,687
Non-credit OTTI in AOCI | (819) | (857)
ABS |  |
Fixed maturities |  |
Amortized cost | 1,619,648 | 1,651,350
Gross unrealized gains | 2,710 | 1,493
Gross unrealized losses | (9,348) | (15,240)
Fair value | 1,613,010 | 1,637,603
Non-credit OTTI in AOCI | 0 | 0
Municipals |  |
Fixed maturities |  |
Amortized cost | 155,414 | 136,068
Gross unrealized gains | 1,481 | 914
Gross unrealized losses | (482) | (1,397)
Fair value | 156,413 | 135,585
Non-credit OTTI in AOCI | $ 0 | $ 0

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- Definition Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. + References No definition available. + Details
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