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Other Comprehensive Income (Loss) (Tables)
 9 Months Ended
Sep. 30, 2012
Other Comprehensive Income (Loss) [Abstract]  
Summary accumulated other comprehensive loss
                 
    September 30,
2012		     December 31,
2011		  
    (Unaudited)  

Unrealized gain on marketable securities

   $ 0     $ 1,685  

Foreign currency translation adjustments

     (4,256 )    $ (6,807 ) 

Employee benefit-related adjustments, net of tax of $2,512 – U.S

     (16,500 )      (16,500 ) 

Employee benefit-related adjustments – Mexico

     (548 )      (548 ) 
   

 

 

    

 

 

  

Accumulated other comprehensive loss

   $ (21,304 )    $ (22,170 )