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INVESTMENTS (DETAILS 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule Of Available For Sale Securities [Line Items]    
Due in one year or less (amortized cost) $ 541,871 $ 710,079
Due after one year through five years (amortized cost) 5,204,615 5,030,728
Due after five years through ten years (amortized cost) 1,763,345 1,852,877
Due after ten years (amortized cost) 228,123 97,364
Total fixed maturities with a single maturity date (amortized cost) 7,737,954 7,691,048
Total (amortized cost) 12,023,304 11,987,146
Due in one year or less (fair value) 547,897 717,052
Due after one year through five years (fair value) 5,288,307 5,116,060
Due after five years through ten years (fair value) 1,742,110 1,791,835
Due after ten years (fair value) 230,137 94,121
Total fixed maturities with a single maturity date (fair value) 7,808,451 7,719,068
Fair Value (fixed maturities) 12,095,839 11,986,327
Due in one year or less (% of total fair value) 4.50% 5.90%
Due after one year through five years (% of total fair value) 43.70% 42.70%
Due after five years through ten years (% of total fair value) 14.40% 14.90%
Due after ten years (% of total fair value) 1.90% 0.80%
Fixed maturities with a single maturity date (% of total fair value) 64.50% 64.30%
Total 100.00% 100.00%
Agency RMBS [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) 2,371,868 2,485,139
Total (amortized cost) 2,371,868 2,485,139
Fixed maturities without a single maturity date (fair value) 2,364,758 2,448,827
Fair Value (fixed maturities) 2,364,758 2,448,827
Fixed maturities without a single maturity date (% of total fair value) 19.60% 20.40%
CMBS [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) 849,279 790,095
Total (amortized cost) 849,279 790,095
Fixed maturities without a single maturity date (fair value) 859,595 797,414
Fair Value (fixed maturities) 859,595 797,414
Fixed maturities without a single maturity date (% of total fair value) 7.10% 6.70%
Non-Agency RMBS [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) 95,261 65,590
Total (amortized cost) 95,261 65,590
Fixed maturities without a single maturity date (fair value) 99,489 67,567
Fair Value (fixed maturities) 99,489 67,567
Fixed maturities without a single maturity date (% of total fair value) 0.80% 0.60%
ABS [Member]
    
Schedule Of Available For Sale Securities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) 968,942 955,274
Total (amortized cost) 968,942 955,274
Fixed maturities without a single maturity date (fair value) 963,546 953,451
Fair Value (fixed maturities) $ 963,546 $ 953,451
Fixed maturities without a single maturity date (% of total fair value) 8.00% 8.00%