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Product Warranty (Tables)
 12 Months Ended
Dec. 31, 2013
Product Warranty  
Schedule of product warranty

 

 

 
   Years Ended December 31,  
 
   2013   2012   2011  
 
   (in thousands)
  

Balance at January 1 (beginning of year)

   $ 1,801   $ 3,697   $ 2,713  

Warranties issued during the period

     2,240     3,042     4,772  

Settlements made during the period

     (1,515 )   (3,010 )   (5,275 )

Changes in estimate of liability for pre-existing warranties during the period

     (1,098 )   (1,928 )   1,487  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Balance at December 31 (end of year)

   $ 1,428   $ 1,801   $ 3,697  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Amount classified as current

   $ 1,316   $ 1,700   $ 3,556  

Amount classified as long-term

     112     101     141  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total Warranty Liability

   $ 1,428   $ 1,801   $ 3,697  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
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