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INVESTMENTS (Fixed Maturities) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 11,898,060 | $ 12,611,219
Gross Unrealized Gains | 77,008 | 101,660
Gross Unrealized Losses | (173,672) | (90,873)
Fair Value (fixed maturities) | 11,801,396 | 12,622,006
Non-credit OTTI in AOCI | (866) | (853)
U.S. government and agency |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,821,951 | 1,727,643
Gross Unrealized Gains | 908 | 1,735
Gross Unrealized Losses | (25,894) | (16,909)
Fair Value (fixed maturities) | 1,796,965 | 1,712,469
Non-credit OTTI in AOCI | 0 | 0
Non-U.S. government |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 649,396 | 798,582
Gross Unrealized Gains | 21,084 | 17,240
Gross Unrealized Losses | (9,256) | (9,523)
Fair Value (fixed maturities) | 661,224 | 806,299
Non-credit OTTI in AOCI | 0 | 0
Corporate debt |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 4,670,815 | 5,265,795
Gross Unrealized Gains | 40,698 | 61,922
Gross Unrealized Losses | (71,082) | (29,851)
Fair Value (fixed maturities) | 4,640,431 | 5,297,866
Non-credit OTTI in AOCI | 0 | 0
Agency RMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,956,394 | 2,414,720
Gross Unrealized Gains | 4,644 | 8,132
Gross Unrealized Losses | (46,193) | (27,700)
Fair Value (fixed maturities) | 1,914,845 | 2,395,152
Non-credit OTTI in AOCI | 0 | 0
CMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,042,704 | 776,715
Gross Unrealized Gains | 1,964 | 4,138
Gross Unrealized Losses | (14,047) | (3,125)
Fair Value (fixed maturities) | 1,030,621 | 777,728
Non-credit OTTI in AOCI | 0 | 0
Non-Agency RMBS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 39,930 | 45,713
Gross Unrealized Gains | 1,997 | 1,917
Gross Unrealized Losses | (530) | (799)
Fair Value (fixed maturities) | 41,397 | 46,831
Non-credit OTTI in AOCI | (866) | (853)
ABS |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,566,484 | 1,432,884
Gross Unrealized Gains | 4,932 | 5,391
Gross Unrealized Losses | (4,718) | (1,994)
Fair Value (fixed maturities) | 1,566,698 | 1,436,281
Non-credit OTTI in AOCI | 0 | 0
Municipals |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 150,386 | 149,167
Gross Unrealized Gains | 781 | 1,185
Gross Unrealized Losses | (1,952) | (972)
Fair Value (fixed maturities) | 149,215 | 149,380
Non-credit OTTI in AOCI | $ 0 | $ 0

X
- 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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