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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2013
Stockholders' Equity/Accumulated Other Comprehensive Loss [Abstract]  
Summary of accumulated other comprehensive loss
                 
        Three months ended      
    March 31,  
    2013     2012  

Beginning balance

   $ (433 )    $ (606 ) 
     

Other comprehensive income (loss) before reclassifications

     (295 )      293  

Amounts reclassified from accumulated other comprehensive loss

     —         —    
   

 

 

    

 

 

  

Net current period other comprehensive income

     (295 )      293  
     

Ending Balance

   $ (728 )    $ (313 )