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INVESTMENTS - Gross Unrealized Losses (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Fixed maturities    
Fair value    
12 months or greater $ 6,293,107 $ 3,615,234
Less than 12 months 1,617,343 6,269,478
Total 7,910,450 9,884,712
Unrealized losses    
12 months or greater (453,997) (497,762)
Less than 12 months (26,518) (358,826)
Total $ (480,515) $ (856,588)
Number of positions in an unrealized loss | security 3,535 4,525
Continuous unrealized loss position | security 3,212 1,842
Fixed maturities | Below Investment Grade or Not Rated    
Unrealized losses    
Total $ (13,000) $ (64,000)
U.S. government and agency    
Fair value    
12 months or greater 846,503 467,032
Less than 12 months 867,733 1,414,181
Total 1,714,236 1,881,213
Unrealized losses    
12 months or greater (42,465) (41,365)
Less than 12 months (12,663) (56,424)
Total (55,128) (97,789)
Non-U.S. government    
Fair value    
12 months or greater 233,038 207,637
Less than 12 months 115,112 298,048
Total 348,150 505,685
Unrealized losses    
12 months or greater (18,178) (33,027)
Less than 12 months (683) (19,885)
Total (18,861) (52,912)
Corporate debt    
Fair value    
12 months or greater 2,623,304 1,562,355
Less than 12 months 240,813 2,350,504
Total 2,864,117 3,912,859
Unrealized losses    
12 months or greater (210,512) (268,289)
Less than 12 months (5,966) (150,701)
Total (216,478) (418,990)
Agency RMBS    
Fair value    
12 months or greater 778,656 220,595
Less than 12 months 218,606 771,191
Total 997,262 991,786
Unrealized losses    
12 months or greater (80,070) (40,469)
Less than 12 months (2,968) (58,832)
Total (83,038) (99,301)
CMBS    
Fair value    
12 months or greater 703,411 343,494
Less than 12 months 75,242 599,877
Total 778,653 943,371
Unrealized losses    
12 months or greater (54,856) (40,888)
Less than 12 months (3,552) (41,257)
Total (58,408) (82,145)
Non-agency RMBS    
Fair value    
12 months or greater 98,483 75,137
Less than 12 months 10,017 53,484
Total 108,500 128,621
Unrealized losses    
12 months or greater (13,013) (14,691)
Less than 12 months (20) (3,834)
Total (13,033) (18,525)
ABS    
Fair value    
12 months or greater 879,743 685,990
Less than 12 months 83,582 686,190
Total 963,325 1,372,180
Unrealized losses    
12 months or greater (24,747) (48,913)
Less than 12 months (274) (21,808)
Total (25,021) (70,721)
Municipals    
Fair value    
12 months or greater 129,969 52,994
Less than 12 months 6,238 96,003
Total 136,207 148,997
Unrealized losses    
12 months or greater (10,156) (10,120)
Less than 12 months (392) (6,085)
Total $ (10,548) $ (16,205)