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RESERVE FOR LOSSES AND LOSS EXPENSES (TABLES)
12 Months Ended
Dec. 31, 2011
RESERVE FOR LOSSES AND LOSS EXPENSES [Abstract]  
COMPONENTS OF RESERVE FOR LOSSES AND LOSS EXPENSES [Table Text Block]
Our reserve for losses and loss expenses comprise the following:
        
     
 As of December 31, 2011  2010 
        
 Reserve for reported losses and loss expenses$ 3,019,372 $ 2,097,484 
 Reserve for losses incurred but not reported  5,405,673   4,934,891 
  Reserve for losses and loss expenses$ 8,425,045 $ 7,032,375 
        
RECONCILIATION OF BEGINNING AND ENDING GROSS UNPAID LOSSES AND LOSS EXPENSES [Table Text Block]
The following table shows a reconciliation of our beginning and ending gross unpaid losses and loss expenses for the periods indicated:
            
     
 Year ended December 31,  2011  2010  2009 
            
 Gross reserve for losses and loss expenses, beginning of period $ 7,032,375 $ 6,564,133 $ 6,244,783 
 Less reinsurance recoverable on unpaid losses, beginning of period   (1,540,633)   (1,381,058)   (1,314,551) 
 Net reserve for losses and loss expenses, beginning of period   5,491,742   5,183,075   4,930,232 
            
 Net incurred losses and loss expenses related to:          
  Current year   2,932,513   1,990,187   1,847,044 
  Prior years   (257,461)   (313,055)   (423,172) 
     2,675,052   1,677,132   1,423,872 
 Net paid losses and loss expenses related to:          
  Current year   (509,075)   (300,293)   (271,011) 
  Prior years   (953,035)   (1,042,890)   (982,036) 
     (1,462,110)   (1,343,183)   (1,253,047) 
            
 Foreign exchange and other   (16,462)   (25,282)   82,018 
            
 Net reserve for losses and loss expenses, end of period   6,688,222   5,491,742   5,183,075 
 Reinsurance recoverable on unpaid losses, end of period   1,736,823   1,540,633   1,381,058 
  Gross reserve for losses and loss expenses, end of period $ 8,425,045 $ 7,032,375 $ 6,564,133 
            
NET PRIOR YEAR RESERVE DEVELOPMENT BY SEGMENT [Table Text Block]
The following table summarizes net favorable reserve development by segment:
           
           
  Insurance Reinsurance Total  
           
 2011$ 103,014 $ 154,447 $ 257,461 
 2010  118,336   194,719   313,055 
 2009  210,861   212,311   423,172