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Product Warranty (Tables)
 9 Months Ended
Sep. 30, 2014
Product Warranty [Abstract]  
Activities in the product warranty accounts
As the Company recognizes revenue under the percentage-of-completion method, it provides an accrual for estimated future warranty costs based on historical experience and projected claims.  The activity in the warranty account is as follows:

(in thousands)
  
   
Balance at December 31, 2013
 
$
1,851
 
Warranty provision
  
574
 
Warranty claims
  
(905
)
Currency adjustment
  
(18
)
Balance at September 30, 2014
 
$
1,502