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FAIR VALUE MEASUREMENTS (TABLES)
12 Months Ended
Dec. 31, 2011
Fair Value Disclosures [Abstract]  
CLO - EQUITIES SIGNIFICANT VALUATION MODEL INPUTS [Table Text Block]
           
 At December 31,    2011 2010 
           
 Default rates4.0% - 5.0% 3.8% - 5.0% 
 Loss severity rate53.5% 65.0% 
 Collateral spreads2.6% - 4.2% 2.4% - 4.2% 
 Estimated maturity dates2.5 - 5.2 years 1.5 - 10.5 years 
           
           
The changes made to the above significant inputs in 2011 did not impact significantly the total change in fair value of the CLO - Equities recognized in earnings.
FINANCIAL INSTRUMENTS MEASURED AT FAIR VALUE ON A RECURRING BASIS [Table Text Block]
The table below presents the financial instruments measured at fair value on a recurring basis.
              
  Quoted Prices in  Significant Significant    
  Active Markets for  Other Observable  Unobservable     
  Identical Assets Inputs Inputs Total Fair 
  (Level 1) (Level 2) (Level 3) Value 
 At December 31, 2011            
 Assets            
 Fixed maturities            
  U.S. government and agency $ 765,519 $ 382,748 $ - $ 1,148,267 
  Non-U.S. government   -   1,212,451   -   1,212,451 
  Corporate debt   -   3,608,041   1,550   3,609,591 
  Agency RMBS   -   2,636,634   -   2,636,634 
  CMBS  -   312,691   -   312,691 
  Non-Agency RMBS  -   165,713   -   165,713 
  ABS  -   582,714   49,328   632,042 
  Municipals  -   1,222,711   -   1,222,711 
    765,519   10,123,703   50,878   10,940,100 
 Equity securities  561,436   116,124   -   677,560 
 Other investments   -   286,516   412,804   699,320 
 Other assets (see Note 7)  -   38,175   -   38,175 
  Total $ 1,326,955 $ 10,564,518 $ 463,682 $ 12,355,155 
              
 Liabilities            
 Other liabilities (see Note 7)$ - $2,035 $ - $2,035 
              
              
 At December 31, 2010            
 Assets            
 Fixed maturities            
  U.S. government and agency $ 588,281 $ 271,839 $ - $ 860,120 
  Non-U.S. government   -   772,798   -   772,798 
  Corporate debt   -   4,161,358   1,550   4,162,908 
  Agency RMBS   -   2,593,582   -   2,593,582 
  CMBS  -   474,785   -   474,785 
  Non-Agency RMBS  -   224,524   19,678   244,202 
  ABS  -   618,665   43,178   661,843 
  Municipals  -   712,659   -   712,659 
    588,281   9,830,210   64,406   10,482,897 
 Equity securities  271,451   77,803   -   349,254 
 Other investments   -   -   519,296   519,296 
 Other assets (see Note 7)  -   6,641   -   6,641 
  Total $ 859,732 $ 9,914,654 $ 583,702 $ 11,358,088 
              
 Liabilities            
 Other liabilities (see Note 7)$ - $ 14,986 $ - $ 14,986 
            
              
During 2011 and 2010, we had no transfers between Levels 1 and 2.
CHANGES IN LEVEL 3 FINANCIAL INSTRUMENTS MEASURED AT FAIR VALUE ON A RECURRING BASIS [Table Text Block]
Level 3 financial instruments                     
                       
The following tables present changes in Level 3 for financial instruments measured at fair value on a recurring basis for the periods indicated: 
                       
   Fixed Maturities       
   Corporate      Non-Agency        Other  Total 
   Debt  CMBS  RMBS   ABS  Total  Investments  Assets 
                       
 Year ended December 31, 2011                     
 Balance at beginning of period$ 1,550 $ - $ 19,678 $ 43,178 $ 64,406 $ 519,296 $ 583,702 
 Total net realized and unrealized gains                     
  included in net income(1)  -   -   -   -   -   74,497   74,497 
 Total net realized and unrealized losses                      
  included in net income(1)  -   -   -   -   -   (43,498)   (43,498) 
 Change in net unrealized gains included                      
  in other comprehensive income  -   -   123   5,289   5,412   -   5,412 
 Change in net unrealized losses included                     
  in other comprehensive income  -   -   (60)   (937)   (997)   -   (997) 
 Purchases   -   -   -   -   -   195,000   195,000 
 Sales  -   -   -   -   -   (25,268)   (25,268) 
 Settlements / distributions  -   -   (2,046)   (93)   (2,139)   (45,720)   (47,859) 
 Transfers into Level 3  -   -   -   1,891   1,891   -   1,891 
 Transfers out of Level 3  -   -   (17,695)   -   (17,695)   (261,503)   (279,198) 
 Balance at end of period$ 1,550 $ - $ - $ 49,328 $ 50,878 $ 412,804 $ 463,682 
                       
 Level 3 gains / losses included in                     
  earnings attributable to the change                     
  in unrealized gains /losses relating                     
  to those assets held at the                     
  reporting date$ - $ - $ - $ - $ - $ 31,855 $ 31,855 
                       
 Year ended December 31, 2010                     
 Balance at beginning of period$ 18,130 $ 2,409 $ 6,639 $ 43,585 $ 70,763 $ 520,188 $ 590,951 
 Total net realized and unrealized gains                     
  included in net income(1)  -   -   -   -   -   60,969   60,969 
 Total net realized and unrealized losses                      
  included in net income(1)  (1,550)   (119)   (581)   (1,134)   (3,384)   -   (3,384) 
 Change in net unrealized gains included                      
  in other comprehensive income  2,201   1,273   1,825   3,361   8,660   -   8,660 
 Change in net unrealized losses included                     
  in other comprehensive income  (34)   (238)   (27)   (71)   (370)   -   (370) 
 Purchases   -   3,474   20,230   4,000   27,704   65,000   92,704 
 Sales  (12)   (206)   (211)   (2,004)   (2,433)   (99,822)   (102,255) 
 Settlements / distributions  -   (694)   (1,832)   (369)   (2,895)   (27,039)   (29,934) 
 Transfers into Level 3  -   -   781   -   781   -   781 
 Transfers out of Level 3  (17,185)   (5,899)   (7,146)   (4,190)   (34,420)   -   (34,420) 
 Balance at end of period$ 1,550 $ - $ 19,678 $ 43,178 $ 64,406 $ 519,296 $ 583,702 
                       
 Level 3 gains / losses included in                     
  earnings attributable to the change                     
  in unrealized gains /losses relating                     
  to those assets held at the                     
  reporting date$ (1,550) $ - $ - $ - $ (1,550) $ 60,969 $ 59,419 
                       
(1) Realized gains and losses on fixed maturities are included in net realized investment gains (losses). Realized gains and (losses) on other investments are included in net investment income.