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Product Warranty Reserve (Tables)
12 Months Ended
Dec. 31, 2013
Guarantees [Abstract]  
Roll Forward of Product Warranty Reserve

The following is a rollforward of the product warranty reserve:

 

     2013     2012     2011  

Balance at January 1

   $ 1,229      $ 824      $ 536   

Additions charged to income

     443        1,384        1,968   

Warranty usage

     (475     (983     (1,467

Currency translation

     (57     4        (213
  

 

 

   

 

 

   

 

 

 

Balance at December 31

   $ 1,140      $ 1,229      $ 824