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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)