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Warranty (Tables)
 12 Months Ended
Dec. 31, 2013
Warranty  
Schedule of reconciliation of changes in product warranty accrual

 

 

 
   December 31,  
 
   2013   2012  
 
   (in thousands)
  

Balance at beginning of period

   $ 3,432   $ 3,800  

Warranty settlement costs

     (2,639 )   (2,486 )

Warranties issued

     3,323     3,140  

Changes in accruals for pre-existing warranties

     (671 )   (1,126 )

Currency translation impact

     31     104  
           
​ ​ ​ ​ ​ ​ ​ ​

Balance at end of period

   $ 3,476   $ 3,432  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​