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INVESTMENTS (Gross Unrealized Losses) (Details) $ in Thousands | Jun. 30, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
--- | --- | ---
U.S. government and agency |  |
Fair value |  |
12 months or greater | $ 0 | $ 9,536
Less than 12 months | 145,664 | 614,705
Total | 145,664 | 624,241
Unrealized losses |  |
12 months or greater | 0 | (67)
Less than 12 months | (26) | (6,246)
Total | (26) | (6,313)
Non-U.S. government |  |
Fair value |  |
12 months or greater | 58,470 | 99,466
Less than 12 months | 221,511 | 18,361
Total | 279,981 | 117,827
Unrealized losses |  |
12 months or greater | (4,522) | (2,036)
Less than 12 months | (5,275) | (412)
Total | (9,797) | (2,448)
Corporate debt |  |
Fair value |  |
12 months or greater | 104,368 | 121,635
Less than 12 months | 910,430 | 375,858
Total | 1,014,798 | 497,493
Unrealized losses |  |
12 months or greater | (6,648) | (3,847)
Less than 12 months | (40,497) | (3,709)
Total | (47,145) | (7,556)
Agency RMBS |  |
Fair value |  |
12 months or greater | 10,288 | 195,395
Less than 12 months | 48,970 | 326,402
Total | 59,258 | 521,797
Unrealized losses |  |
12 months or greater | (50) | (1,816)
Less than 12 months | (226) | (1,638)
Total | (276) | (3,454)
CMBS |  |
Fair value |  |
12 months or greater | 10,374 | 24,281
Less than 12 months | 132,310 | 364,641
Total | 142,684 | 388,922
Unrealized losses |  |
12 months or greater | (931) | (64)
Less than 12 months | (3,095) | (4,878)
Total | (4,026) | (4,942)
Non-agency RMBS |  |
Fair value |  |
12 months or greater | 4,836 | 6,345
Less than 12 months | 26,659 | 25,816
Total | 31,495 | 32,161
Unrealized losses |  |
12 months or greater | (1,075) | (792)
Less than 12 months | (1,167) | (60)
Total | (2,242) | (852)
ABS |  |
Fair value |  |
12 months or greater | 275,127 | 535,780
Less than 12 months | 745,695 | 404,641
Total | 1,020,822 | 940,421
Unrealized losses |  |
12 months or greater | (10,585) | (4,667)
Less than 12 months | (21,633) | (1,213)
Total | (32,218) | (5,880)
Municipals |  |
Fair value |  |
12 months or greater | 0 | 5,418
Less than 12 months | 14,905 | 46,684
Total | 14,905 | 52,102
Unrealized losses |  |
12 months or greater | 0 | (34)
Less than 12 months | (176) | (373)
Total | (176) | (407)
Fixed maturities |  |
Fair value |  |
12 months or greater | 463,463 | 997,856
Less than 12 months | 2,246,144 | 2,177,108
Total | 2,709,607 | 3,174,964
Unrealized losses |  |
12 months or greater | (23,811) | (13,323)
Less than 12 months | (72,095) | (18,529)
Total | $ (95,906) | $ (31,852)
Number of securities in unrealized loss position | security | 1,545 | 1,190
Number of securities in a continuous unrealized loss position | security | 351 | 497
Fixed maturities | Below Investment Grade or Not Rated |  |
Unrealized losses |  |
Total | $ (35,000) | $ (5,000)

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