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INVESTMENTS - Amortized cost or cost and fair values (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fixed maturities |  |
Amortized Cost or Cost | $ 12,611,219 | $ 11,523,316
Gross Unrealized Gains | 101,660 | 70,993
Gross Unrealized Losses | (90,873) | (197,195)
Fair Value | 12,622,006 | 11,397,114
Non-credit OTTI in AOCI | (853) | (823)
Equity securities |  |
Amortized Cost or Cost | 552,867 | 597,366
Gross Unrealized Gains | 84,527 | 53,446
Gross Unrealized Losses | (1,883) | (12,068)
Fair Value | 635,511 | 638,744
U.S. government and agency |  |
Fixed maturities |  |
Amortized Cost or Cost | 1,727,643 | 1,681,425
Gross Unrealized Gains | 1,735 | 1,648
Gross Unrealized Losses | (16,909) | (27,004)
Fair Value | 1,712,469 | 1,656,069
Non-credit OTTI in AOCI | 0 | 0
Non-U.S. government |  |
Fixed maturities |  |
Amortized Cost or Cost | 798,582 | 613,282
Gross Unrealized Gains | 17,240 | 2,206
Gross Unrealized Losses | (9,523) | (49,654)
Fair Value | 806,299 | 565,834
Non-credit OTTI in AOCI | 0 | 0
Corporate debt |  |
Fixed maturities |  |
Amortized Cost or Cost | 5,265,795 | 4,633,834
Gross Unrealized Gains | 61,922 | 42,049
Gross Unrealized Losses | (29,851) | (75,140)
Fair Value | 5,297,866 | 4,600,743
Non-credit OTTI in AOCI | 0 | 0
Agency RMBS |  |
Fixed maturities |  |
Amortized Cost or Cost | 2,414,720 | 2,487,837
Gross Unrealized Gains | 8,132 | 13,275
Gross Unrealized Losses | (27,700) | (35,977)
Fair Value | 2,395,152 | 2,465,135
Non-credit OTTI in AOCI | 0 | 0
CMBS |  |
Fixed maturities |  |
Amortized Cost or Cost | 776,715 | 664,368
Gross Unrealized Gains | 4,138 | 5,433
Gross Unrealized Losses | (3,125) | (3,564)
Fair Value | 777,728 | 666,237
Non-credit OTTI in AOCI | 0 | 0
Non-Agency RMBS |  |
Fixed maturities |  |
Amortized Cost or Cost | 45,713 | 57,316
Gross Unrealized Gains | 1,917 | 1,628
Gross Unrealized Losses | (799) | (2,023)
Fair Value | 46,831 | 56,921
Non-credit OTTI in AOCI | (853) | (823)
ABS |  |
Fixed maturities |  |
Amortized Cost or Cost | 1,432,884 | 1,221,813
Gross Unrealized Gains | 5,391 | 3,244
Gross Unrealized Losses | (1,994) | (2,843)
Fair Value | 1,436,281 | 1,222,214
Non-credit OTTI in AOCI | 0 | 0
Municipals |  |
Fixed maturities |  |
Amortized Cost or Cost | 149,167 | 163,441
Gross Unrealized Gains | 1,185 | 1,510
Gross Unrealized Losses | (972) | (990)
Fair Value | 149,380 | 163,961
Non-credit OTTI in AOCI | 0 | 0
Common stocks |  |
Equity securities |  |
Amortized Cost or Cost | 22,836 | 379
Gross Unrealized Gains | 3,412 | 41
Gross Unrealized Losses | (590) | (342)
Fair Value | 25,658 | 78
Exchange-traded funds |  |
Equity securities |  |
Amortized Cost or Cost | 356,252 | 463,936
Gross Unrealized Gains | 71,675 | 53,405
Gross Unrealized Losses | (294) | (2,634)
Fair Value | 427,633 | 514,707
Bond mutual funds |  |
Equity securities |  |
Amortized Cost or Cost | 173,779 | 133,051
Gross Unrealized Gains | 9,440 | 0
Gross Unrealized Losses | (999) | (9,092)
Fair Value | $ 182,220 | $ 123,959

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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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