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INVESTMENTS (Gross Unrealized Losses) (Details) $ in Thousands | Sep. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
U.S. government and agency |  |
Fixed maturities |  |
Fair Value - 12 months or greater | $ 311,591 | $ 194,916
Unrealized Losses - 12 months or greater | (10,619) | (5,963)
Fair Value - Less than 12 months | 1,228,100 | 1,389,792
Unrealized Losses - Less than 12 months | (9,444) | (10,946)
Total Fair Value of Securities in Unrealized Loss Position | 1,539,691 | 1,584,708
Total Unrealized Losses | (20,063) | (16,909)
Non-U.S. government |  |
Fixed maturities |  |
Fair Value - 12 months or greater | 34,550 | 62,878
Unrealized Losses - 12 months or greater | (2,086) | (6,806)
Fair Value - Less than 12 months | 382,172 | 204,110
Unrealized Losses - Less than 12 months | (11,664) | (2,717)
Total Fair Value of Securities in Unrealized Loss Position | 416,722 | 266,988
Total Unrealized Losses | (13,750) | (9,523)
Corporate debt |  |
Fixed maturities |  |
Fair Value - 12 months or greater | 621,298 | 407,300
Unrealized Losses - 12 months or greater | (28,190) | (11,800)
Fair Value - Less than 12 months | 3,256,619 | 2,041,845
Unrealized Losses - Less than 12 months | (59,186) | (18,051)
Total Fair Value of Securities in Unrealized Loss Position | 3,877,917 | 2,449,145
Total Unrealized Losses | (87,376) | (29,851)
Agency RMBS |  |
Fixed maturities |  |
Fair Value - 12 months or greater | 722,287 | 759,255
Unrealized Losses - 12 months or greater | (33,738) | (17,453)
Fair Value - Less than 12 months | 780,730 | 1,172,313
Unrealized Losses - Less than 12 months | (18,148) | (10,247)
Total Fair Value of Securities in Unrealized Loss Position | 1,503,017 | 1,931,568
Total Unrealized Losses | (51,886) | (27,700)
CMBS |  |
Fixed maturities |  |
Fair Value - 12 months or greater | 105,887 | 31,607
Unrealized Losses - 12 months or greater | (3,944) | (703)
Fair Value - Less than 12 months | 832,183 | 348,943
Unrealized Losses - Less than 12 months | (19,558) | (2,422)
Total Fair Value of Securities in Unrealized Loss Position | 938,070 | 380,550
Total Unrealized Losses | (23,502) | (3,125)
Non-Agency RMBS |  |
Fixed maturities |  |
Fair Value - 12 months or greater | 10,821 | 8,029
Unrealized Losses - 12 months or greater | (946) | (788)
Fair Value - Less than 12 months | 6,067 | 4,197
Unrealized Losses - Less than 12 months | (16) | (11)
Total Fair Value of Securities in Unrealized Loss Position | 16,888 | 12,226
Total Unrealized Losses | (962) | (799)
ABS |  |
Fixed maturities |  |
Fair Value - 12 months or greater | 157,894 | 57,298
Unrealized Losses - 12 months or greater | (2,115) | (570)
Fair Value - Less than 12 months | 844,190 | 392,170
Unrealized Losses - Less than 12 months | (4,865) | (1,424)
Total Fair Value of Securities in Unrealized Loss Position | 1,002,084 | 449,468
Total Unrealized Losses | (6,980) | (1,994)
Municipals |  |
Fixed maturities |  |
Fair Value - 12 months or greater | 33,043 | 11,230
Unrealized Losses - 12 months or greater | (1,327) | (269)
Fair Value - Less than 12 months | 71,150 | 65,632
Unrealized Losses - Less than 12 months | (1,574) | (703)
Total Fair Value of Securities in Unrealized Loss Position | 104,193 | 76,862
Total Unrealized Losses | (2,901) | (972)
Fixed maturities |  |
Fixed maturities |  |
Fair Value - 12 months or greater | 1,997,371 | 1,532,513
Unrealized Losses - 12 months or greater | (82,965) | (44,352)
Fair Value - Less than 12 months | 7,401,211 | 5,619,002
Unrealized Losses - Less than 12 months | (124,455) | (46,521)
Total Fair Value of Securities in Unrealized Loss Position | 9,398,582 | 7,151,515
Total Unrealized Losses | $ (207,420) | $ (90,873)
Equity securities |  |
Number of available for sale securities in unrealized loss positions | security | 3,444 | 2,424
Number of available for sale securities in unrealized loss positions for 12 months or greater | security | 940 | 627
Fixed maturities | Below Investment Grade or Not Rated |  |
Fixed maturities |  |
Total Unrealized Losses | $ (13,000) | $ (7,000)
Common stocks |  |
Equity securities |  |
Fair Value - 12 months or greater |  | 0
Unrealized Losses - 12 months or greater |  | 0
Fair Value - Less than 12 months |  | 3,202
Unrealized Losses - Less than 12 months |  | (590)
Total Fair Value of Securities in Unrealized Loss Position |  | 3,202
Total Unrealized Losses |  | (590)
Exchange-traded funds |  |
Equity securities |  |
Fair Value - 12 months or greater |  | 0
Unrealized Losses - 12 months or greater |  | 0
Fair Value - Less than 12 months |  | 12,323
Unrealized Losses - Less than 12 months |  | (294)
Total Fair Value of Securities in Unrealized Loss Position |  | 12,323
Total Unrealized Losses |  | (294)
Bond mutual funds |  |
Equity securities |  |
Fair Value - 12 months or greater |  | 0
Unrealized Losses - 12 months or greater |  | 0
Fair Value - Less than 12 months |  | 12,184
Unrealized Losses - Less than 12 months |  | (999)
Total Fair Value of Securities in Unrealized Loss Position |  | 12,184
Total Unrealized Losses |  | (999)
Equity securities |  |
Equity securities |  |
Fair Value - 12 months or greater |  | 0
Unrealized Losses - 12 months or greater |  | 0
Fair Value - Less than 12 months |  | 27,709
Unrealized Losses - Less than 12 months |  | (1,883)
Total Fair Value of Securities in Unrealized Loss Position |  | 27,709
Total Unrealized Losses |  | $ (1,883)

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