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Product Warranty Reserves (Tables)
 9 Months Ended
Sep. 30, 2013
Product Warranty Reserves [Abstract]  
Product warranty reserves
Changes in the Company's product warranty liability for the three and nine-month periods ended September 30, 2013 and 2012 are as follows (in thousands):

 
 
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
 
 
 
2013
  
2012
  
2013
  
2012
 
Reserve balance, beginning of the period
 
$
11,690
  
$
12,634
  
$
11,052
  
$
12,663
 
Warranty liabilities accrued
  
3,151
   
3,270
   
9,418
   
9,118
 
Warranty liabilities settled
  
(2,288
)
  
(2,494
)
  
(7,640
)
  
(8,366
)
Other
  
-
   
31
   
(277
)
  
26
 
Reserve balance, end of the period
 
$
12,553
  
$
13,441
  
$
12,553
  
$
13,441