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INVESTMENTS - Gross Unrealized Losses (Details) $ in Thousands | Jun. 30, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Fixed maturities, available for sale |  |
Fair value |  |
12 months or greater | $ 876,839 | $ 390,141
Less than 12 months | 9,909,797 | 6,197,689
Total | 10,786,636 | 6,587,830
Unrealized losses |  |
12 months or greater | (102,738) | (17,715)
Less than 12 months | (676,932) | (76,531)
Total | $ (779,670) | $ (94,246)
Number of securities in unrealized loss position | security | 4,683 | 2,333
Number of securities in a continuous unrealized loss position | security | 596 | 344
Fixed maturities, available for sale | Below Investment Grade or Not Rated |  |
Unrealized losses |  |
Total | $ (112,000) | $ (8,000)
U.S. government and agency |  |
Fair value |  |
12 months or greater | 122,651 | 101,776
Less than 12 months | 2,195,005 | 2,014,880
Total | 2,317,656 | 2,116,656
Unrealized losses |  |
12 months or greater | (7,887) | (4,852)
Less than 12 months | (83,887) | (15,795)
Total | (91,774) | (20,647)
Non-U.S. government |  |
Fair value |  |
12 months or greater | 110,395 | 11,011
Less than 12 months | 518,117 | 463,498
Total | 628,512 | 474,509
Unrealized losses |  |
12 months or greater | (4,730) | (1,830)
Less than 12 months | (45,980) | (7,855)
Total | (50,710) | (9,685)
Corporate debt |  |
Fair value |  |
12 months or greater | 292,790 | 152,962
Less than 12 months | 3,811,687 | 1,681,859
Total | 4,104,477 | 1,834,821
Unrealized losses |  |
12 months or greater | (52,735) | (6,542)
Less than 12 months | (366,028) | (31,570)
Total | (418,763) | (38,112)
Agency RMBS |  |
Fair value |  |
12 months or greater | 83,182 | 41,024
Less than 12 months | 848,929 | 503,988
Total | 932,111 | 545,012
Unrealized losses |  |
12 months or greater | (11,443) | (1,678)
Less than 12 months | (52,926) | (7,103)
Total | (64,369) | (8,781)
CMBS |  |
Fair value |  |
12 months or greater | 53,589 | 30,128
Less than 12 months | 1,020,626 | 347,515
Total | 1,074,215 | 377,643
Unrealized losses |  |
12 months or greater | (7,560) | (1,001)
Less than 12 months | (53,212) | (3,686)
Total | (60,772) | (4,687)
Non-agency RMBS |  |
Fair value |  |
12 months or greater | 26,816 | 4,481
Less than 12 months | 117,424 | 109,937
Total | 144,240 | 114,418
Unrealized losses |  |
12 months or greater | (3,089) | (523)
Less than 12 months | (11,253) | (1,500)
Total | (14,342) | (2,023)
ABS |  |
Fair value |  |
12 months or greater | 183,000 | 43,466
Less than 12 months | 1,254,295 | 1,040,363
Total | 1,437,295 | 1,083,829
Unrealized losses |  |
12 months or greater | (14,795) | (1,152)
Less than 12 months | (53,783) | (8,513)
Total | (68,578) | (9,665)
Municipals |  |
Fair value |  |
12 months or greater | 4,416 | 5,293
Less than 12 months | 143,714 | 35,649
Total | 148,130 | 40,942
Unrealized losses |  |
12 months or greater | (499) | (137)
Less than 12 months | (9,863) | (509)
Total | $ (10,362) | $ (646)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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