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INVESTMENTS (Contractual Maturities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]    
Due in one year or less (amortized cost) $ 470,471 $ 486,659
Due after one year through five years (amortized cost) 4,881,214 4,906,207
Due after five years through ten years (amortized cost) 1,818,888 2,338,964
Due after ten years (amortized cost) 203,850 209,357
Total fixed maturities with a single maturity date (amortized cost) 7,374,423 7,941,187
Amortized Cost 11,911,889 12,611,219
Due in one year or less (fair value) 463,126 484,663
Due after one year through five years (fair value) 4,828,882 4,912,189
Due after five years through ten years (fair value) 1,769,098 2,350,433
Due after ten years (fair value) 203,166 218,729
Total fixed maturities with a single maturity date (fair value) 7,264,272 7,966,014
Fair Value $ 11,739,305 $ 12,622,006
Due in one year or less (% of total fair value) 4.00% 3.80%
Due after one year through five years (% of total fair value) 41.10% 38.90%
Due after five years through ten years (% of total fair value) 15.10% 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) 61.90% 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) $ 1,738,740 $ 2,414,720
Amortized Cost 1,738,740 2,414,720
Fixed maturities without a single maturity date (fair value) 1,699,728 2,395,152
Fair Value $ 1,699,728 $ 2,395,152
Fixed maturities without a single maturity date (% of total fair value) 14.50% 19.00%
CMBS    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) $ 1,142,204 $ 776,715
Amortized Cost 1,142,204 776,715
Fixed maturities without a single maturity date (fair value) 1,121,967 777,728
Fair Value $ 1,121,967 $ 777,728
Fixed maturities without a single maturity date (% of total fair value) 9.60% 6.20%
Non-Agency RMBS    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) $ 38,572 $ 45,713
Amortized Cost 38,572 45,713
Fixed maturities without a single maturity date (fair value) 39,304 46,831
Fair Value $ 39,304 $ 46,831
Fixed maturities without a single maturity date (% of total fair value) 0.30% 0.40%
ABS    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) $ 1,617,950 $ 1,432,884
Amortized Cost 1,617,950 1,432,884
Fixed maturities without a single maturity date (fair value) 1,614,034 1,436,281
Fair Value $ 1,614,034 $ 1,436,281
Fixed maturities without a single maturity date (% of total fair value) 13.70% 11.40%