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Warranties (Tables)
3 Months Ended
Mar. 31, 2016
Product Warranties Disclosures [Abstract]  
Schedule of warranty liability and related activity

Warranty liability and related activity consisted of the following (in thousands):

 

   Three-Month Periods Ended
March 31,
 
   2016   2015 
Beginning balance  $760   $824 
Warranty provisions   71    44 
Warranty claims   (95)   (86)
Adjustments to preexisting warranties   24    (25)
Ending balance  $760   $757