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Product Warranty (Tables)
6 Months Ended
Jun. 30, 2013
Product Warranty [Abstract]  
Activities in the product warranty accounts
The activity in the warranty account is as follows:

(in thousands)
   
     
Balance at December 31, 2012
 $2,107 
Warranty provision
  225 
Warranty claims
  (544)
Currency adjustment
  (10)
Balance at June 30, 2013
 $1,778