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INVESTMENTS (Fixed Maturities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fixed maturities |  |
Amortized Cost | $ 11,941,555 | $ 12,611,219
Gross Unrealized Gains | 33,562 | 101,660
Gross Unrealized Losses | (207,420) | (90,873)
Fair Value | 11,767,697 | 12,622,006
Non-credit OTTI in AOCI | (868) | (853)
U.S. government and agency |  |
Fixed maturities |  |
Amortized Cost | 1,625,114 | 1,727,643
Gross Unrealized Gains | 414 | 1,735
Gross Unrealized Losses | (20,063) | (16,909)
Fair Value | 1,605,465 | 1,712,469
Non-credit OTTI in AOCI | 0 | 0
Non-U.S. government |  |
Fixed maturities |  |
Amortized Cost | 558,862 | 798,582
Gross Unrealized Gains | 3,013 | 17,240
Gross Unrealized Losses | (13,750) | (9,523)
Fair Value | 548,125 | 806,299
Non-credit OTTI in AOCI | 0 | 0
Corporate debt |  |
Fixed maturities |  |
Amortized Cost | 5,144,747 | 5,265,795
Gross Unrealized Gains | 23,714 | 61,922
Gross Unrealized Losses | (87,376) | (29,851)
Fair Value | 5,081,085 | 5,297,866
Non-credit OTTI in AOCI | 0 | 0
Agency RMBS |  |
Fixed maturities |  |
Amortized Cost | 1,688,977 | 2,414,720
Gross Unrealized Gains | 2,140 | 8,132
Gross Unrealized Losses | (51,886) | (27,700)
Fair Value | 1,639,231 | 2,395,152
Non-credit OTTI in AOCI | 0 | 0
CMBS |  |
Fixed maturities |  |
Amortized Cost | 1,099,728 | 776,715
Gross Unrealized Gains | 729 | 4,138
Gross Unrealized Losses | (23,502) | (3,125)
Fair Value | 1,076,955 | 777,728
Non-credit OTTI in AOCI | 0 | 0
Non-Agency RMBS |  |
Fixed maturities |  |
Amortized Cost | 41,273 | 45,713
Gross Unrealized Gains | 1,475 | 1,917
Gross Unrealized Losses | (962) | (799)
Fair Value | 41,786 | 46,831
Non-credit OTTI in AOCI | (868) | (853)
ABS |  |
Fixed maturities |  |
Amortized Cost | 1,651,271 | 1,432,884
Gross Unrealized Gains | 1,520 | 5,391
Gross Unrealized Losses | (6,980) | (1,994)
Fair Value | 1,645,811 | 1,436,281
Non-credit OTTI in AOCI | 0 | 0
Municipals |  |
Fixed maturities |  |
Amortized Cost | 131,583 | 149,167
Gross Unrealized Gains | 557 | 1,185
Gross Unrealized Losses | (2,901) | (972)
Fair Value | 129,239 | 149,380
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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