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Derivative Instruments (Tables)
9 Months Ended
Sep. 30, 2011
Derivative Instruments [Abstract] 
Schedule Of Derivative Fair Values On Condensed Consolidated Balance Sheets
Schedule Of Unrealized And Realized Gains (Losses) On Derivatives Recorded In The Consolidated Income Statement
                                         
            Three Months Ended     Nine Months Ended  
            September 30,     September 30,  
    Location of Gain (Loss) Recognized in                          
    the Consolidated Income Statements     2011     2010     2011     2010  
Derivatives not designated as hedging instruments                                
Relating to investment portfolio:
                                       
Foreign exchange contracts
  Net realized investment losses   $ (5,343 )   $     $ (4,620 )   $  
Interest rate futures
  Net realized investment losses     (37,942 )           (54,201 )      
 
                             
 
          $ (43,285 )   $     $ (58,821 )   $  
 
                                       
Relating to operating activities and capital management:                                
Foreign exchange contracts
  Foreign exchange (losses) gains   $ (8,075 )   $ 4,832     $ (5,474 )   $ 3,420  
Treasury yield hedge
  Net realized investment losses                       (3,958 )
 
                             
Total derivatives
          $ (51,360 )   $ 4,832     $ (64,295 )   $ (538 )