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Other Comprehensive Income (Loss) (Tables)
12 Months Ended
Dec. 31, 2012
Other Comprehensive Income (Loss) [Abstract]  
Components of other comprehensive income (loss) pretax and after-tax
                         
    Year Ended December 30, 2010  
    Pretax     Tax     After-tax  

Net unrealized gains on available-for-sale investments arising during the periods

  $ 4,983     $ (1,925   $ 3,058  
       

Less: realized gains on investments

    5,744       (2,216     3,528  
       

Less: reclassification of unrealized losses relating to the reclassification of investment portfolio to trading from available-for-sale

    (656     253       (403
       

Less: realized foreign currency gains on investments

    809       (312     497  
   

 

 

   

 

 

   

 

 

 

Change in net unrealized gains (losses) on available-for-sale investments

    (914     350       (564
   

 

 

   

 

 

   

 

 

 

Other comprehensive income (loss)

  $ (914   $ 350     $ (564