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INVESTMENTS - Contractual Maturities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Amortized cost    
Due in one year or less $ 576,989 $ 422,039
Due after one year through five years 5,400,687 5,349,123
Due after five years through ten years 2,171,234 2,192,344
Due after ten years 174,926 234,046
Total fixed maturities with a single maturity date 8,323,836 8,197,552
Amortized cost, Total 12,264,498 12,176,473
Fair value    
Due in one year or less 563,123 409,972
Due after one year through five years 5,204,250 5,078,273
Due after five years through ten years 1,974,369 1,919,450
Due after ten years 163,281 205,575
Total fixed maturities with a single maturity date 7,905,023 7,613,270
Fair value, Total $ 11,627,555 $ 11,326,894
% of Total fair value    
Due in one year or less 4.90% 3.70%
Due after one year through five years (as a percent) 44.80% 44.80%
Due after five years through ten years (as a percent) 17.00% 16.90%
Due after ten years (as a percent) 1.40% 1.80%
Fixed maturities with a single maturity date (as a percent) 68.10% 67.20%
Total (as a percent) 100.00% 100.00%
Agency RMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 1,344,187 $ 1,297,423
Amortized cost, Total 1,344,187 1,297,423
Fair value    
Fixed maturities without a single maturity date 1,272,161 1,202,785
Fair value, Total $ 1,272,161 $ 1,202,785
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 10.90% 10.60%
CMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 996,699 $ 1,029,863
Amortized cost, Total 996,699 1,029,863
Fair value    
Fixed maturities without a single maturity date 923,503 947,778
Fair value, Total $ 923,503 $ 947,778
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 7.90% 8.40%
Non-agency RMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 145,288 $ 151,907
Amortized cost, Total 145,288 151,907
Fair value    
Fixed maturities without a single maturity date 129,485 133,534
Fair value, Total $ 129,485 $ 133,534
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 1.10% 1.20%
ABS    
Amortized cost    
Fixed maturities without a single maturity date $ 1,454,488 $ 1,499,728
Amortized cost, Total 1,454,488 1,499,728
Fair value    
Fixed maturities without a single maturity date 1,397,383 1,429,527
Fair value, Total $ 1,397,383 $ 1,429,527
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 12.00% 12.60%
Held-to-maturity securities without a single maturity date $ 632,000 $ 613,000
Corporate debt    
Amortized cost    
Amortized cost, Total 4,619,198 4,680,798
Fair value    
Fair value, Total 4,297,212 4,255,556
% of Total fair value    
Held-to-maturity securities with maturity after three years through 10 years 81,000 81,000
Held-to-maturity securities with maturity after ten years $ 4,000 $ 4,000
Corporate debt | Minimum    
% of Total fair value    
Debt securities, held-to-maturity, maturity period 3 years  
Corporate debt | Maximum    
% of Total fair value    
Debt securities, held-to-maturity, maturity period 10 years