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Product Warranty
 6 Months Ended
Jun. 30, 2013
Product Warranty [Abstract]  
Product Warranty
10.  
Product Warranty

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