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INVESTMENTS - Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Amortized cost    
Due in one year or less $ 752,064 $ 474,557
Due after one year through five years 6,089,410 5,902,571
Due after five years through ten years 2,408,029 2,064,619
Due after ten years 238,425 157,653
Total fixed maturities with a single maturity date 9,487,928 8,599,400
Amortized cost, total 13,806,792 12,634,254
Fair value    
Due in one year or less 748,123 463,789
Due after one year through five years 6,132,217 5,790,493
Due after five years through ten years 2,380,767 1,954,449
Due after ten years 239,719 155,287
Total fixed maturities with a single maturity date 9,500,826 8,364,018
Fair value, total $ 13,768,193 $ 12,234,742
% of Total fair value    
Due in one year or less (as a percent) 5.50% 3.60%
Due after one year through five years (as a percent) 44.50% 47.30%
Due after five years through ten years (as a percent) 17.30% 16.00%
Due after ten years (as a percent) 1.70% 1.30%
Fixed maturities with a single maturity date (as a percent) 69.00% 68.20%
Total (as a percent) 100.00% 100.00%
Agency RMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 1,764,991 $ 1,706,204
Amortized cost, total 1,764,991 1,706,204
Fair value    
Fixed maturities without a single maturity date 1,747,063 1,634,661
Fair value, total $ 1,747,063 $ 1,634,661
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 12.70% 13.40%
CMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 839,795 $ 897,553
Amortized cost, total 839,795 897,553
Fair value    
Fixed maturities without a single maturity date 810,757 839,696
Fair value, total $ 810,757 $ 839,696
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 5.90% 6.90%
Non-agency RMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 132,009 $ 165,910
Amortized cost, total 132,009 165,910
Fair value    
Fixed maturities without a single maturity date 124,445 153,396
Fair value, total $ 124,445 $ 153,396
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 0.90% 1.30%
ABS    
Amortized cost    
Fixed maturities without a single maturity date $ 1,582,069 $ 1,265,187
Amortized cost, total 1,582,069 1,265,187
Fair value    
Fixed maturities without a single maturity date 1,585,102 1,242,971
Fair value, total $ 1,585,102 $ 1,242,971
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 11.50% 10.20%