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INVESTMENTS (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Amortized cost    
Due in one year or less $ 517,901 $ 436,287
Due after one year through five years 4,819,479 4,165,696
Due after five years through ten years 2,433,271 2,344,859
Due after ten years 269,475 258,654
Total fixed maturities with a single maturity date 8,040,126 7,205,496
Amortized cost, Total 12,202,767 11,566,930
Fair value    
Due in one year or less 522,219 444,527
Due after one year through five years 4,895,887 4,335,219
Due after five years through ten years 2,464,807 2,489,050
Due after ten years 271,774 273,025
Total fixed maturities with a single maturity date 8,154,687 7,541,821
Fair value $ 12,380,959 $ 12,041,799
% of Total fair value    
Due in one year or less (as a percent) 4.20% 3.60%
Due after one year through five years (as a percent) 39.50% 36.00%
Due after five years through ten years (as a percent) 19.90% 20.70%
Due after ten years (as a percent) 2.20% 2.30%
Fixed maturities with a single maturity date (as a percent) 65.80% 62.60%
Total (as a percent) 100.00% 100.00%
Net carrying value $ 416,879  
Agency RMBS    
Amortized cost    
Fixed maturities without a single maturity date 1,144,205 $ 1,244,727
Amortized cost, Total 1,144,205 1,244,727
Fair value    
Fixed maturities without a single maturity date 1,163,038 1,286,209
Fair value $ 1,163,038 $ 1,286,209
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 9.40% 10.70%
CMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 1,185,705 $ 1,268,273
Amortized cost, Total 1,185,705 1,268,273
Fair value    
Fixed maturities without a single maturity date 1,226,225 1,353,587
Fair value $ 1,226,225 $ 1,353,587
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 9.90% 11.20%
Non-agency RMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 192,129 $ 136,198
Amortized cost, Total 192,129 136,198
Fair value    
Fixed maturities without a single maturity date 193,764 140,104
Fair value $ 193,764 $ 140,104
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 1.60% 1.20%
ABS    
Amortized cost    
Fixed maturities without a single maturity date $ 1,640,602 $ 1,712,236
Amortized cost, Total 1,640,602 1,712,236
Fair value    
Fixed maturities without a single maturity date 1,643,245 1,720,078
Fair value $ 1,643,245 $ 1,720,078
% of Total fair value    
Fixed maturities without a single maturity date (as a percent) 13.30% 14.30%
Net carrying value $ 406,879 $ 0