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INVESTMENTS (Gross Unrealized Losses) (Details) $ in Thousands | Sep. 30, 2019 USD ($) security | Dec. 31, 2018 USD ($) security
--- | --- | ---
U.S. government and agency |  |
Fair value |  |
12 months or greater | $ 12,694 | $ 374,030
Less than 12 months | 558,741 | 424,439
Total | 571,435 | 798,469
Unrealized losses |  |
12 months or greater | (91) | (7,659)
Less than 12 months | (2,867) | (1,018)
Total | (2,958) | (8,677)
Non-U.S. government |  |
Fair value |  |
12 months or greater | 114,923 | 44,339
Less than 12 months | 179,943 | 303,376
Total | 294,866 | 347,715
Unrealized losses |  |
12 months or greater | (7,546) | (2,004)
Less than 12 months | (4,462) | (14,116)
Total | (12,008) | (16,120)
Corporate debt |  |
Fair value |  |
12 months or greater | 218,327 | 1,439,378
Less than 12 months | 601,466 | 2,547,135
Total | 819,793 | 3,986,513
Unrealized losses |  |
12 months or greater | (11,414) | (58,915)
Less than 12 months | (11,514) | (69,529)
Total | (22,928) | (128,444)
Agency RMBS |  |
Fair value |  |
12 months or greater | 241,041 | 940,645
Less than 12 months | 200,089 | 117,181
Total | 441,130 | 1,057,826
Unrealized losses |  |
12 months or greater | (2,394) | (29,255)
Less than 12 months | (842) | (629)
Total | (3,236) | (29,884)
CMBS |  |
Fair value |  |
12 months or greater | 24,550 | 455,582
Less than 12 months | 100,241 | 353,802
Total | 124,791 | 809,384
Unrealized losses |  |
12 months or greater | (65) | (11,430)
Less than 12 months | (800) | (2,365)
Total | (865) | (13,795)
Non-Agency RMBS |  |
Fair value |  |
12 months or greater | 5,409 | 9,494
Less than 12 months | 19,393 | 11,432
Total | 24,802 | 20,926
Unrealized losses |  |
12 months or greater | (1,135) | (1,170)
Less than 12 months | (451) | (112)
Total | (1,586) | (1,282)
ABS |  |
Fair value |  |
12 months or greater | 402,080 | 237,237
Less than 12 months | 420,285 | 1,150,692
Total | 822,365 | 1,387,929
Unrealized losses |  |
12 months or greater | (5,186) | (2,755)
Less than 12 months | (1,011) | (12,485)
Total | (6,197) | (15,240)
Municipals |  |
Fair value |  |
12 months or greater | 7,747 | 68,814
Less than 12 months | 9,601 | 9,894
Total | 17,348 | 78,708
Unrealized losses |  |
12 months or greater | (109) | (1,373)
Less than 12 months | (68) | (24)
Total | (177) | (1,397)
Fixed maturities |  |
Fair value |  |
12 months or greater | 1,026,771 | 3,569,519
Less than 12 months | 2,089,759 | 4,917,951
Total | 3,116,530 | 8,487,470
Unrealized losses |  |
12 months or greater | (27,940) | (114,561)
Less than 12 months | (22,015) | (100,278)
Total | $ (49,955) | $ (214,839)
Number of securities in unrealized loss position | security | 1,541 | 3,599
Number of securities in a continuous unrealized loss position | security | 633 | 1,656
Fixed maturities | Below Investment Grade or Not Rated |  |
Unrealized losses |  |
Total | $ (11,000) | $ (49,000)

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