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INVESTMENTS - Schedule of Fair Value of Fixed Maturity Investments Trading (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]    
Total fixed maturity investments trading $ 12,671,098 $ 13,507,131
U.S. treasuries    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 5,745,880 6,247,779
Corporate    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 4,121,508 3,689,286
Agencies    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 375,894 361,684
Non-U.S. government    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 443,869 549,613
Residential mortgage-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 698,496 955,301
Commercial mortgage-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading 257,827 634,925
Asset-backed    
Schedule of Investments [Line Items]    
Total fixed maturity investments trading $ 1,027,624 $ 1,068,543