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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2015
Commitments and Contingencies [Abstract]  
Changes in Product Warranties
The following table provides the changes in our product warranties (in thousands):

  
Three Months Ended
September 30,
  
Nine Months Ended
September 30,
 
  
2015
  
2014
  
2015
  
2014
 
Balance, beginning of period
 
$
25,148
  
$
22,801
  
$
19,328
  
$
18,041
 
Liabilities accrued for current year sales
  
25,626
   
21,490
   
72,613
   
63,106
 
Settlements of warranty claims
  
(24,919
)
  
(22,457
)
  
(66,086
)
  
(59,313
)
Balance, end of period
 
$
25,855
  
$
21,834
  
$
25,855
  
$
21,834