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INVESTMENTS - Gross Unrealized Losses (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Fixed maturities, available for sale    
Fair value    
12 months or greater $ 5,353,809 $ 6,293,107
Less than 12 months 3,673,152 1,617,343
Total 9,026,961 7,910,450
Unrealized losses    
12 months or greater (450,397) (453,997)
Less than 12 months (41,993) (26,518)
Total $ (492,390) $ (480,515)
Number of securities in unrealized loss position | security 4,138 3,535
Number of securities in a continuous unrealized loss position | security 3,004 3,212
Fixed maturities, available for sale | Below Investment Grade or Not Rated    
Unrealized losses    
Total $ (11,000) $ (13,000)
U.S. government and agency    
Fair value    
12 months or greater 657,958 846,503
Less than 12 months 1,669,439 867,733
Total 2,327,397 1,714,236
Unrealized losses    
12 months or greater (40,409) (42,465)
Less than 12 months (17,059) (12,663)
Total (57,468) (55,128)
Non-U.S. government    
Fair value    
12 months or greater 224,688 233,038
Less than 12 months 274,043 115,112
Total 498,731 348,150
Unrealized losses    
12 months or greater (20,529) (18,178)
Less than 12 months (3,269) (683)
Total (23,798) (18,861)
Corporate debt    
Fair value    
12 months or greater 2,337,348 2,623,304
Less than 12 months 862,666 240,813
Total 3,200,014 2,864,117
Unrealized losses    
12 months or greater (202,913) (210,512)
Less than 12 months (9,979) (5,966)
Total (212,892) (216,478)
Agency RMBS    
Fair value    
12 months or greater 810,334 778,656
Less than 12 months 414,071 218,606
Total 1,224,405 997,262
Unrealized losses    
12 months or greater (96,973) (80,070)
Less than 12 months (6,549) (2,968)
Total (103,522) (83,038)
CMBS    
Fair value    
12 months or greater 665,150 703,411
Less than 12 months 86,723 75,242
Total 751,873 778,653
Unrealized losses    
12 months or greater (47,233) (54,856)
Less than 12 months (3,352) (3,552)
Total (50,585) (58,408)
Non-agency RMBS    
Fair value    
12 months or greater 86,352 98,483
Less than 12 months 15,966 10,017
Total 102,318 108,500
Unrealized losses    
12 months or greater (12,562) (13,013)
Less than 12 months (88) (20)
Total (12,650) (13,033)
ABS    
Fair value    
12 months or greater 447,941 879,743
Less than 12 months 343,163 83,582
Total 791,104 963,325
Unrealized losses    
12 months or greater (19,575) (24,747)
Less than 12 months (1,300) (274)
Total (20,875) (25,021)
Municipals    
Fair value    
12 months or greater 124,038 129,969
Less than 12 months 7,081 6,238
Total 131,119 136,207
Unrealized losses    
12 months or greater (10,203) (10,156)
Less than 12 months (397) (392)
Total $ (10,600) $ (10,548)