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INVESTMENTS (Gross Unrealized Losses) (Details) $ in Thousands | Mar. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
U.S. government and agency |  |
Fair value |  |
12 months or greater | $ 0 | $ 0
Less than 12 months | 973,758 | 251,606
Total | 973,758 | 251,606
Unrealized losses |  |
12 months or greater | 0 | 0
Less than 12 months | (14,899) | (1,759)
Total | (14,899) | (1,759)
Non-U.S. government |  |
Fair value |  |
12 months or greater | 2,257 | 16,115
Less than 12 months | 156,529 | 3,652
Total | 158,786 | 19,767
Unrealized losses |  |
12 months or greater | (485) | (262)
Less than 12 months | (2,941) | (166)
Total | (3,426) | (428)
Corporate debt |  |
Fair value |  |
12 months or greater | 62,713 | 63,640
Less than 12 months | 1,036,713 | 233,970
Total | 1,099,426 | 297,610
Unrealized losses |  |
12 months or greater | (1,576) | (2,244)
Less than 12 months | (24,881) | (4,114)
Total | (26,457) | (6,358)
Agency RMBS |  |
Fair value |  |
12 months or greater | 154 | 6,580
Less than 12 months | 447,303 | 78,672
Total | 447,457 | 85,252
Unrealized losses |  |
12 months or greater | (4) | (20)
Less than 12 months | (7,381) | (668)
Total | (7,385) | (688)
CMBS |  |
Fair value |  |
12 months or greater | 18,422 | 19,736
Less than 12 months | 133,199 | 70,656
Total | 151,621 | 90,392
Unrealized losses |  |
12 months or greater | (140) | (1,012)
Less than 12 months | (3,401) | (1,272)
Total | (3,541) | (2,284)
Non-agency RMBS |  |
Fair value |  |
12 months or greater | 6,153 | 5,109
Less than 12 months | 59,008 | 9,558
Total | 65,161 | 14,667
Unrealized losses |  |
12 months or greater | (478) | (598)
Less than 12 months | (405) | (80)
Total | (883) | (678)
ABS |  |
Fair value |  |
12 months or greater | 95,782 | 325,436
Less than 12 months | 241,242 | 360,402
Total | 337,024 | 685,838
Unrealized losses |  |
12 months or greater | (1,537) | (4,011)
Less than 12 months | (1,325) | (2,674)
Total | (2,862) | (6,685)
Municipals |  |
Fair value |  |
12 months or greater | 0 | 0
Less than 12 months | 80,414 | 11,881
Total | 80,414 | 11,881
Unrealized losses |  |
12 months or greater | 0 | 0
Less than 12 months | (1,539) | (31)
Total | (1,539) | (31)
Fixed maturities, available for sale |  |
Fair value |  |
12 months or greater | 185,481 | 436,616
Less than 12 months | 3,128,166 | 1,020,397
Total | 3,313,647 | 1,457,013
Unrealized losses |  |
12 months or greater | (4,220) | (8,147)
Less than 12 months | (56,772) | (10,764)
Total | $ (60,992) | $ (18,911)
Number of securities in unrealized loss position | security | 1,553 | 719
Number of securities in a continuous unrealized loss position | security | 205 | 249
Fixed maturities, available for sale | Below Investment Grade or Not Rated |  |
Unrealized losses |  |
Total | $ (5,000) | $ (7,000)

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