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INVESTMENTS (Gross Unrealized Losses) (Details) $ in Thousands | Sep. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
--- | --- | ---
U.S. government and agency |  |
Fair value |  |
12 months or greater | $ 92,049 | $ 0
Less than 12 months | 1,550,593 | 251,606
Total | 1,642,642 | 251,606
Unrealized losses |  |
12 months or greater | (3,892) | 0
Less than 12 months | (6,913) | (1,759)
Total | (10,805) | (1,759)
Unrealized loss | (10,805) | (1,759)
Non-U.S. government |  |
Fair value |  |
12 months or greater | 2,826 | 16,115
Less than 12 months | 352,085 | 3,652
Total | 354,911 | 19,767
Unrealized losses |  |
12 months or greater | (880) | (262)
Less than 12 months | (6,975) | (166)
Total | (7,855) | (428)
Unrealized loss | (7,855) | (428)
Corporate debt |  |
Fair value |  |
12 months or greater | 47,626 | 63,640
Less than 12 months | 1,331,148 | 233,970
Total | 1,378,774 | 297,610
Unrealized losses |  |
12 months or greater | (1,938) | (2,244)
Less than 12 months | (22,478) | (4,114)
Total | (24,416) | (6,358)
Unrealized loss | (24,416) | (6,358)
Agency RMBS |  |
Fair value |  |
12 months or greater | 23,194 | 6,580
Less than 12 months | 454,841 | 78,672
Total | 478,035 | 85,252
Unrealized losses |  |
12 months or greater | (878) | (20)
Less than 12 months | (4,502) | (668)
Total | (5,380) | (688)
Unrealized loss | (5,380) | (688)
CMBS |  |
Fair value |  |
12 months or greater | 12,019 | 19,736
Less than 12 months | 184,367 | 70,656
Total | 196,386 | 90,392
Unrealized losses |  |
12 months or greater | (304) | (1,012)
Less than 12 months | (2,103) | (1,272)
Total | (2,407) | (2,284)
Unrealized loss | (2,407) | (2,284)
Non-agency RMBS |  |
Fair value |  |
12 months or greater | 4,630 | 5,109
Less than 12 months | 69,865 | 9,558
Total | 74,495 | 14,667
Unrealized losses |  |
12 months or greater | (527) | (598)
Less than 12 months | (581) | (80)
Total | (1,108) | (678)
Unrealized loss | (1,108) | (678)
ABS |  |
Fair value |  |
12 months or greater | 45,628 | 325,436
Less than 12 months | 523,180 | 360,402
Total | 568,808 | 685,838
Unrealized losses |  |
12 months or greater | (929) | (4,011)
Less than 12 months | (2,739) | (2,674)
Total | (3,668) | (6,685)
Unrealized loss | (3,668) | (6,685)
Municipals |  |
Fair value |  |
12 months or greater | 0 | 0
Less than 12 months | 21,828 | 11,881
Total | 21,828 | 11,881
Unrealized losses |  |
12 months or greater | 0 | 0
Less than 12 months | (242) | (31)
Total | (242) | (31)
Unrealized loss | (242) | (31)
Fixed maturities, available for sale |  |
Fair value |  |
12 months or greater | 227,972 | 436,616
Less than 12 months | 4,487,907 | 1,020,397
Total | 4,715,879 | 1,457,013
Unrealized losses |  |
12 months or greater | (9,348) | (8,147)
Less than 12 months | (46,533) | (10,764)
Total | $ (55,881) | $ (18,911)
Number of securities in unrealized loss position | security | 1,721 | 719
Unrealized loss | $ (55,881) | $ (18,911)
Number of securities in a continuous unrealized loss position | security | 186 | 249
Fixed maturities, available for sale | Below Investment Grade or Not Rated |  |
Unrealized losses |  |
Total | $ (4,000) | $ (7,000)
Unrealized loss | $ (4,000) | $ (7,000)

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