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INVESTMENTS (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]    
Due in one year or less (amortized cost) $ 513,226 $ 486,659
Due after one year through five years (amortized cost) 4,642,999 4,906,207
Due after five years through ten years (amortized cost) 1,942,501 2,338,964
Due after ten years (amortized cost) 193,822 209,357
Total fixed maturities with a single maturity date (amortized cost) 7,292,548 7,941,187
Total (amortized cost) 11,898,060 12,611,219
Due in one year or less (fair value) 507,980 484,663
Due after one year through five years (fair value) 4,626,323 4,912,189
Due after five years through ten years (fair value) 1,911,664 2,350,433
Due after ten years (fair value) 201,868 218,729
Total fixed maturities with a single maturity date (fair value) 7,247,835 7,966,014
Fair Value (fixed maturities) $ 11,801,396 $ 12,622,006
Due in one year or less (% of total fair value) 4.30% 3.80%
Due after one year through five years (% of total fair value) 39.20% 38.90%
Due after five years through ten years (% of total fair value) 16.20% 18.60%
Due after ten years (% of total fair value) 1.70% 1.70%
Fixed maturities with a single maturity date (% of total fair value) 61.40% 63.00%
Total 100.00% 100.00%
Agency RMBS    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) $ 1,956,394 $ 2,414,720
Total (amortized cost) 1,956,394 2,414,720
Fixed maturities without a single maturity date (fair value) 1,914,845 2,395,152
Fair Value (fixed maturities) $ 1,914,845 $ 2,395,152
Fixed maturities without a single maturity date (% of total fair value) 16.20% 19.00%
CMBS    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) $ 1,042,704 $ 776,715
Total (amortized cost) 1,042,704 776,715
Fixed maturities without a single maturity date (fair value) 1,030,621 777,728
Fair Value (fixed maturities) $ 1,030,621 $ 777,728
Fixed maturities without a single maturity date (% of total fair value) 8.70% 6.20%
Non-Agency RMBS    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) $ 39,930 $ 45,713
Total (amortized cost) 39,930 45,713
Fixed maturities without a single maturity date (fair value) 41,397 46,831
Fair Value (fixed maturities) $ 41,397 $ 46,831
Fixed maturities without a single maturity date (% of total fair value) 0.40% 0.40%
ABS    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) $ 1,566,484 $ 1,432,884
Total (amortized cost) 1,566,484 1,432,884
Fixed maturities without a single maturity date (fair value) 1,566,698 1,436,281
Fair Value (fixed maturities) $ 1,566,698 $ 1,436,281
Fixed maturities without a single maturity date (% of total fair value) 13.30% 11.40%