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INVESTMENTS - Gross Unrealized Losses (Details) $ in Thousands | Sep. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Fair value |  |
12 months or greater | $ 4,152,544 | $ 6,293,107
Less than 12 months | 837,820 | 1,617,343
Total | 4,990,364 | 7,910,450
Unrealized losses |  |
12 months or greater | (247,174) | (453,997)
Less than 12 months | (8,754) | (26,518)
Total | $ (255,928) | $ (480,515)
Number of securities in unrealized loss position | security | 2,897 | 3,535
Number of securities in a continuous unrealized loss position | security | 2,525 | 3,212
Below Investment Grade or Not Rated |  |
Unrealized losses |  |
Total | $ (9,000) | $ (13,000)
U.S. government and agency |  |
Fair value |  |
12 months or greater | 427,033 | 846,503
Less than 12 months | 259,245 | 867,733
Total | 686,278 | 1,714,236
Unrealized losses |  |
12 months or greater | (20,361) | (42,465)
Less than 12 months | (606) | (12,663)
Total | (20,967) | (55,128)
Non-U.S. government |  |
Fair value |  |
12 months or greater | 150,570 | 233,038
Less than 12 months | 17,874 | 115,112
Total | 168,444 | 348,150
Unrealized losses |  |
12 months or greater | (7,512) | (18,178)
Less than 12 months | (402) | (683)
Total | (7,914) | (18,861)
Corporate debt |  |
Fair value |  |
12 months or greater | 1,878,476 | 2,623,304
Less than 12 months | 361,048 | 240,813
Total | 2,239,524 | 2,864,117
Unrealized losses |  |
12 months or greater | (117,310) | (210,512)
Less than 12 months | (6,759) | (5,966)
Total | (124,069) | (216,478)
Agency RMBS |  |
Fair value |  |
12 months or greater | 653,678 | 778,656
Less than 12 months | 113,908 | 218,606
Total | 767,586 | 997,262
Unrealized losses |  |
12 months or greater | (46,088) | (80,070)
Less than 12 months | (866) | (2,968)
Total | (46,954) | (83,038)
CMBS |  |
Fair value |  |
12 months or greater | 641,584 | 703,411
Less than 12 months | 9,869 | 75,242
Total | 651,453 | 778,653
Unrealized losses |  |
12 months or greater | (32,567) | (54,856)
Less than 12 months | (24) | (3,552)
Total | (32,591) | (58,408)
Non-agency RMBS |  |
Fair value |  |
12 months or greater | 74,745 | 98,483
Less than 12 months | 1,166 | 10,017
Total | 75,911 | 108,500
Unrealized losses |  |
12 months or greater | (8,497) | (13,013)
Less than 12 months | (5) | (20)
Total | (8,502) | (13,033)
ABS |  |
Fair value |  |
12 months or greater | 209,382 | 879,743
Less than 12 months | 73,236 | 83,582
Total | 282,618 | 963,325
Unrealized losses |  |
12 months or greater | (8,532) | (24,747)
Less than 12 months | (73) | (274)
Total | (8,605) | (25,021)
Municipals |  |
Fair value |  |
12 months or greater | 117,076 | 129,969
Less than 12 months | 1,474 | 6,238
Total | 118,550 | 136,207
Unrealized losses |  |
12 months or greater | (6,307) | (10,156)
Less than 12 months | (19) | (392)
Total | $ (6,326) | $ (10,548)

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