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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2011
Derivative Instruments  
Schedule of Derivative Fair Values on Condensed Consolidated Balance Sheets
                                                               
            June 30, 2011                     December 31, 2010        
    Asset             Liability             Asset             Liability        
    Derivative     Asset     Derivative     Liability     Derivative     Asset     Derivative     Liability  
    Notional     Derivative     Notional     Derivative     Notional     Derivative     Notional     Derivative  
    Amount     Fair Value     Amount     Fair Value     Amount     Fair Value     Amount     Fair Value  
Derivatives not designated as hedging instruments                                                
Relating to investment portfolio:
                                                               
Foreign exchange contracts (1)
  $ 122,311     $ 1,487     $ 33,873     $ 204     $     $     $     $  
Interest rate futures (1)
    1,797,200       4,183       142,300       32                          
 
                                               
 
  $ 1,919,511     $ 5,670     $ 176,173     $ 236     $     $     $     $  
Relating to operating activities:
                                                               
Foreign exchange contracts (2)
  $ 125,528     $ 1,378     $ 34,830     $ 418     $ 26,758     $ 858     $ 51,308     $ 1,629  
 
                                               
Total derivatives
  $ 2,045,039     $ 7,048     $ 211,003     $ 654     $ 26,758     $ 858     $ 51,308     $ 1,629  
 
                                               
(1)   Asset and liability derivatives relating to the investment portfolio are classified within "balances receivable on sale of investments" or "balances due on the purchase of investments" on the consolidated balance sheets.
 
(2)   Asset and liability derivatives relating to operating activities are classified within "other assets" or "other liabilities" on the consolidated balance sheets.
Schedule of Unrealized and Realized Gains (Losses) on Derivatives Recorded in the Consolidated Income Statement
                                     
    Location of Gain (Loss)   Three Months Ended     Six Months Ended  
    Recognized in the Consolidated   June 30,     June 30,  
    Income Statements   2011     2010     2011     2010  
Derivatives not designated as hedging instruments
                                   
Relating to investment portfolio:
                                   
Foreign exchange contracts
  Net realized investment gains   $ 723     $     $ 723     $  
Interest rate futures
  Net realized investment losses     (10,763 )           (16,259 )      
 
                           
 
      $ (10,040 )   $     $ (15,536 )   $  
 
                                   
Relating to operating activities:
                                   
Foreign exchange contracts
  Foreign exchange gains (losses)   $ 1,345     $ (1,361 )   $ 2,601     $ (1,412 )
 
                           
Total derivatives
      $ (8,695 )   $ (1,361 )   $ (12,935 )   $ (1,412 )
 
                    ~~~~~a