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Product Warranty Reserve (Tables)
9 Months Ended
Sep. 30, 2013
Guarantees [Abstract]  
Roll Forward of Product Warranty Reserve

The following is a rollforward of the product warranty reserve:

 

     Nine month period
ended September 30,
 
     2013     2012  

Balance at the beginning of period

   $ 1,229      $ 824   

Additions charged to income

     245        1,009   

Warranty usage

     (357     (649

Currency translation

     (32     11   
  

 

 

   

 

 

 

End of period balance

   $ 1,085      $ 1,195