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Product Warranty Reserve (Tables)
3 Months Ended
Mar. 31, 2013
Product Warranty Reserve [Abstract]  
Roll forward of the product warranty reserve
                 
    Three Months Ended March 31,  
    2013     2012  

Balance at the beginning of period

  $ 1,229     $ 824  

Additions charged to income

    0       422  

Warranty usage

    (157     (182

Currency translation

    10       40  
   

 

 

   

 

 

 

End of period balance

  $ 1,082     $ 1,104