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INVESTMENTS (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Amortized cost    
Due in one year or less $ 584,411 $ 436,287
Due after one year through five years 4,361,986 4,165,696
Due after five years through ten years 2,324,428 2,344,859
Due after ten years 236,654 258,654
Total fixed maturities with a single maturity date 7,507,479 7,205,496
Amortized Cost, Total 11,480,507 11,566,930
Fair value    
Due in one year or less 593,485 444,527
Due after one year through five years 4,482,143 4,335,219
Due after five years through ten years 2,363,912 2,489,050
Due after ten years 236,398 273,025
Total fixed maturities with a single maturity date 7,675,938 7,541,821
Fair value $ 11,728,611 $ 12,041,799
% of Total fair value    
Due in one year or less 5.00% 3.60%
Due after one year through five years 38.20% 36.00%
Due after five years through ten years 20.20% 20.70%
Due after ten years 2.00% 2.30%
Fixed maturities with a single maturity date 65.40% 62.60%
Total 100.00% 100.00%
Agency RMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 1,186,277 $ 1,244,727
Amortized Cost, Total 1,186,277 1,244,727
Fair value    
Fixed maturities without a single maturity date 1,208,494 1,286,209
Fair value $ 1,208,494 $ 1,286,209
% of Total fair value    
Fixed maturities without a single maturity date 10.30% 10.70%
CMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 1,227,004 $ 1,268,273
Amortized Cost, Total 1,227,004 1,268,273
Fair value    
Fixed maturities without a single maturity date 1,274,049 1,353,587
Fair value $ 1,274,049 $ 1,353,587
% of Total fair value    
Fixed maturities without a single maturity date 10.90% 11.20%
Non-agency RMBS    
Amortized cost    
Fixed maturities without a single maturity date $ 163,617 $ 136,198
Amortized Cost, Total 163,617 136,198
Fair value    
Fixed maturities without a single maturity date 167,169 140,104
Fair value $ 167,169 $ 140,104
% of Total fair value    
Fixed maturities without a single maturity date 1.40% 1.20%
ABS    
Amortized cost    
Fixed maturities without a single maturity date $ 1,396,130 $ 1,712,236
Amortized Cost, Total 1,396,130 1,712,236
Fair value    
Fixed maturities without a single maturity date 1,402,961 1,720,078
Fair value $ 1,402,961 $ 1,720,078
% of Total fair value    
Fixed maturities without a single maturity date 12.00% 14.30%