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Product Warranty (Tables)
 6 Months Ended
Jun. 30, 2012
Product Warranty [Abstract]  
Activities in the product warranty accounts
The activity in the warranty account is as follows:
 

(in thousands)
 
   
Balance at December 31, 2011
$  
 2,300
Warranty provision
         613
Warranty claims
        (437)
Currency adjustment
          (13)
Balance at June 30, 2012
$  
 2,463