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INVESTMENTS - Gross Unrealized Losses (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Fixed maturities, available for sale    
Fair value    
12 months or greater $ 6,253,850 $ 3,615,234
Less than 12 months 2,779,448 6,269,478
Total 9,033,298 9,884,712
Unrealized losses    
12 months or greater (583,859) (497,762)
Less than 12 months (82,502) (358,826)
Total $ (666,361) $ (856,588)
Number of securities in unrealized loss position | security 4,372 4,525
Number of securities in a continuous unrealized loss position | security 3,154 1,842
Fixed maturities, available for sale | Below Investment Grade or Not Rated    
Unrealized losses    
Total $ (47,000) $ (64,000)
U.S. government and agency    
Fair value    
12 months or greater 808,593 467,032
Less than 12 months 738,852 1,414,181
Total 1,547,445 1,881,213
Unrealized losses    
12 months or greater (51,696) (41,365)
Less than 12 months (18,799) (56,424)
Total (70,495) (97,789)
Non-U.S. government    
Fair value    
12 months or greater 263,740 207,637
Less than 12 months 109,543 298,048
Total 373,283 505,685
Unrealized losses    
12 months or greater (31,114) (33,027)
Less than 12 months (2,215) (19,885)
Total (33,329) (52,912)
Corporate debt    
Fair value    
12 months or greater 2,499,437 1,562,355
Less than 12 months 1,166,503 2,350,504
Total 3,665,940 3,912,859
Unrealized losses    
12 months or greater (287,339) (268,289)
Less than 12 months (34,475) (150,701)
Total (321,814) (418,990)
Agency RMBS    
Fair value    
12 months or greater 533,145 220,595
Less than 12 months 433,607 771,191
Total 966,752 991,786
Unrealized losses    
12 months or greater (64,620) (40,469)
Less than 12 months (16,517) (58,832)
Total (81,137) (99,301)
CMBS    
Fair value    
12 months or greater 764,365 343,494
Less than 12 months 140,843 599,877
Total 905,208 943,371
Unrealized losses    
12 months or greater (66,063) (40,888)
Less than 12 months (7,298) (41,257)
Total (73,361) (82,145)
Non-agency RMBS    
Fair value    
12 months or greater 99,758 75,137
Less than 12 months 23,591 53,484
Total 123,349 128,621
Unrealized losses    
12 months or greater (15,383) (14,691)
Less than 12 months (456) (3,834)
Total (15,839) (18,525)
ABS    
Fair value    
12 months or greater 1,179,697 685,990
Less than 12 months 134,693 686,190
Total 1,314,390 1,372,180
Unrealized losses    
12 months or greater (56,118) (48,913)
Less than 12 months (1,779) (21,808)
Total (57,897) (70,721)
Municipals    
Fair value    
12 months or greater 105,115 52,994
Less than 12 months 31,816 96,003
Total 136,931 148,997
Unrealized losses    
12 months or greater (11,526) (10,120)
Less than 12 months (963) (6,085)
Total $ (12,489) $ (16,205)