Product Warranty Reserve (Tables)
 9 Months Ended
Sep. 30, 2016
Guarantees [Abstract]  
Roll Forward of Product Warranty Reserve

The following is a rollforward of the product warranty reserve:

 

     Nine Months Ended September 30  
     2016      2015  

Beginning of period balance

    $ 714       $ 892   

Additions charged to income

      423         17   

Warranty usage

      (59 )       (139 ) 

Currency translation

      (21 )       (108 ) 
  

 

 

     

 

 

  

End of period balance

    $ 1,057       $ 662