v2.4.0.6
INVESTMENTS (DETAILS 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Contractual Maturities [Line Items]    
Due in one year or less (amortized cost) $ 543,100 $ 476,807
Due after one year through five years (amortized cost) 4,694,832 4,096,477
Due after five years through ten years (amortized cost) 1,779,811 1,605,419
Due after ten years (amortized cost) 119,926 221,631
Total fixed maturities with single maturity date (amortized cost) 7,137,669 6,400,334
Total (amortized cost) 10,821,338 10,346,243
Due in one year or less (fair value) 539,009 489,190
Due after one year through five years (fair value) 4,685,866 4,144,144
Due after five years through ten years (fair value) 1,845,054 1,655,061
Due after ten years (fair value) 123,091 220,090
Total fixed maturities with a single maturity date (fair value) 7,193,020 6,508,485
Fair Value (fixed maturities) 10,940,100 10,482,897
Due in one year or less (% of total fair value) 4.90% 4.70%
Due after one year through five years (% of total fair value) 42.80% 39.50%
Due after five years through ten years (% of total fair value) 16.90% 15.80%
Due after ten years (% of total fair value) 1.10% 2.10%
Fixed maturities with single maturity date (% of total fair value) 65.70% 62.10%
% of Total Fair Value 100.00% 100.00%
Agency RMBS [Member]
    
Schedule Of Contractual Maturities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) 2,568,053 2,571,124
Total (amortized cost) 2,568,053 2,571,124
Fixed maturities without a single maturity date (fair value) 2,636,634 2,593,582
Fair Value (fixed maturities) 2,636,634 2,593,582
Fixed maturities without a single maturity date (% of total fair value) 24.10% 24.70%
CMBS [Member]
    
Schedule Of Contractual Maturities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) 298,138 454,288
Total (amortized cost) 298,138 454,288
Fixed maturities without a single maturity date (fair value) 312,691 474,785
Fair Value (fixed maturities) 312,691 474,785
Fixed maturities without a single maturity date (% of total fair value) 2.90% 4.50%
Non-Agency RMBS [Member]
    
Schedule Of Contractual Maturities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) 177,529 252,460
Total (amortized cost) 177,529 252,460
Fixed maturities without a single maturity date (fair value) 165,713 244,202
Fair Value (fixed maturities) 165,713 244,202
Fixed maturities without a single maturity date (% of total fair value) 1.50% 2.40%
ABS [Member]
    
Schedule Of Contractual Maturities [Line Items]    
Fixed maturities without a single maturity date (amortized cost) 639,949 668,037
Total (amortized cost) 639,949 668,037
Fixed maturities without a single maturity date (fair value) 632,042 661,843
Fair Value (fixed maturities) $ 632,042 $ 661,843
Fixed maturities without a single maturity date (% of total fair value) 5.80% 6.30%