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INVESTMENTS (Gross Unrealized Losses) (Details) $ in Thousands | Jun. 30, 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 | 1,528,019 | 251,606
Total | 1,528,019 | 251,606
Unrealized losses |  |
12 months or greater | 0 | 0
Less than 12 months | (9,782) | (1,759)
Total | (9,782) | (1,759)
Non-U.S. government |  |
Fair value |  |
12 months or greater | 2,678 | 16,115
Less than 12 months | 195,003 | 3,652
Total | 197,681 | 19,767
Unrealized losses |  |
12 months or greater | (540) | (262)
Less than 12 months | (2,241) | (166)
Total | (2,781) | (428)
Corporate debt |  |
Fair value |  |
12 months or greater | 48,590 | 63,640
Less than 12 months | 862,851 | 233,970
Total | 911,441 | 297,610
Unrealized losses |  |
12 months or greater | (1,227) | (2,244)
Less than 12 months | (11,787) | (4,114)
Total | (13,014) | (6,358)
Agency RMBS |  |
Fair value |  |
12 months or greater | 4,548 | 6,580
Less than 12 months | 313,431 | 78,672
Total | 317,979 | 85,252
Unrealized losses |  |
12 months or greater | (88) | (20)
Less than 12 months | (3,404) | (668)
Total | (3,492) | (688)
CMBS |  |
Fair value |  |
12 months or greater | 7,078 | 19,736
Less than 12 months | 96,788 | 70,656
Total | 103,866 | 90,392
Unrealized losses |  |
12 months or greater | (79) | (1,012)
Less than 12 months | (1,324) | (1,272)
Total | (1,403) | (2,284)
Non-agency RMBS |  |
Fair value |  |
12 months or greater | 5,058 | 5,109
Less than 12 months | 84,771 | 9,558
Total | 89,829 | 14,667
Unrealized losses |  |
12 months or greater | (457) | (598)
Less than 12 months | (465) | (80)
Total | (922) | (678)
ABS |  |
Fair value |  |
12 months or greater | 49,347 | 325,436
Less than 12 months | 465,758 | 360,402
Total | 515,105 | 685,838
Unrealized losses |  |
12 months or greater | (523) | (4,011)
Less than 12 months | (1,875) | (2,674)
Total | (2,398) | (6,685)
Municipals |  |
Fair value |  |
12 months or greater | 0 | 0
Less than 12 months | 74,459 | 11,881
Total | 74,459 | 11,881
Unrealized losses |  |
12 months or greater | 0 | 0
Less than 12 months | (140) | (31)
Total | (140) | (31)
Fixed maturities, available for sale |  |
Fair value |  |
12 months or greater | 117,299 | 436,616
Less than 12 months | 3,621,080 | 1,020,397
Total | 3,738,379 | 1,457,013
Unrealized losses |  |
12 months or greater | (2,914) | (8,147)
Less than 12 months | (31,018) | (10,764)
Total | $ (33,932) | $ (18,911)
Number of securities in unrealized loss position | security | 1,403 | 719
Number of securities in a continuous unrealized loss position | security | 162 | 249
Fixed maturities, available for sale | Below Investment Grade or Not Rated |  |
Unrealized losses |  |
Total | $ (3,000) | $ (7,000)

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