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INVESTMENTS (DETAILS 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2011
Dec. 31, 2010
Schedule Of Contractual Maturities [Line Items]  
Due in one year or less (amortized cost)$ 454,659$ 476,807
Due after one year through five years (amortized cost)4,687,3624,096,477
Due after five years through ten years (amortized cost)1,694,6061,605,419
Due after ten years (amortized cost)163,177221,631
Total fixed maturities with single maturity date (amortized cost)6,999,8046,400,334
Total (amortized cost)10,641,18710,346,243
Due in one year or less (fair value)454,403489,190
Due after one year through five years (fair value)4,672,5684,144,144
Due after five years through ten years (fair value)1,734,4731,655,061
Due after ten years (fair value)165,728220,090
Total fixed maturities with a single maturity date (fair value)7,027,1726,508,485
Fair Value (fixed maturities)10,736,72910,482,897
Due in one year or less (% of total fair value)4.20%4.70%
Due after one year through five years (% of total fair value)43.60%39.50%
Due after five years through ten years (% of total fair value)16.20%15.80%
Due after ten years (% of total fair value)1.50%2.10%
Fixed maturities with single maturity date (% of total fair value)65.50%62.10%
Total100.00%100.00%
Agency RMBS [Member]
  
Schedule Of Contractual Maturities [Line Items]  
Fixed maturities without a single maturity date (amortized cost)2,538,2932,571,124
Total (amortized cost)2,538,2932,571,124
Fixed maturities without a single maturity date (fair value)2,611,0692,593,582
Fair Value (fixed maturities)2,611,0692,593,582
Fixed maturities without a single maturity date (% of total fair value)24.30%24.70%
CMBS [Member]
  
Schedule Of Contractual Maturities [Line Items]  
Fixed maturities without a single maturity date (amortized cost)273,278454,288
Total (amortized cost)273,278454,288
Fixed maturities without a single maturity date (fair value)283,160474,785
Fair Value (fixed maturities)283,160474,785
Fixed maturities without a single maturity date (% of total fair value)2.60%4.50%
Non-Agency RMBS [Member]
  
Schedule Of Contractual Maturities [Line Items]  
Fixed maturities without a single maturity date (amortized cost)186,480252,460
Total (amortized cost)186,480252,460
Fixed maturities without a single maturity date (fair value)176,786244,202
Fair Value (fixed maturities)176,786244,202
Fixed maturities without a single maturity date (% of total fair value)1.70%2.40%
ABS [Member]
  
Schedule Of Contractual Maturities [Line Items]  
Fixed maturities without a single maturity date (amortized cost)643,332668,037
Total (amortized cost)643,332668,037
Fixed maturities without a single maturity date (fair value)638,542661,843
Fair Value (fixed maturities)$ 638,542$ 661,843
Fixed maturities without a single maturity date (% of total fair value)5.90%6.30%