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Product Warranties (Tables)
 12 Months Ended
Dec. 31, 2014
Product Warranties [Abstract]  
Product warranty activity

The following table summarizes product warranty activity recorded for years ended December 31, 2014, 2013 and 2012:

 
 
Year Ended December 31,
 
(In thousands)
 
2014
  
2013
  
2012
 
Balance—beginning of period
 
$
301
  
$
294
  
$
797
 
Provision for new warranties
  
66
   
249
   
568
 
Payments
  
(117
)
  
(258
)
  
(1,071
)
Sale of certain assets and liabilities
  
(8
)
  
16
   
—
 
Balance—end of period
 
$
242
  
$
301
  
$
294