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Product Warranty (Tables)
6 Months Ended
Jun. 30, 2012
Product Warranty [Abstract]  
Summary of product warranty activity
                 
    Six months ended
June 30,
 
    2012     2011  

Beginning balance

  $ 933     $ 887  

Charges to expense

    243       233  

Costs incurred

    (252     (325
   

 

 

   

 

 

 

Ending balance

  $ 924     $ 795