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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2016
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,
 
  
2016
  
2015
  
2016
  
2015
 
Balance, beginning of period
 
$
26,946
  
$
25,148
  
$
23,395
  
$
19,328
 
Liabilities accrued for current year sales
  
30,479
   
25,626
   
78,478
   
72,613
 
Settlements of warranty claims
  
(28,921
)
  
(24,919
)
  
(73,369
)
  
(66,086
)
Balance, end of period
 
$
28,504
  
$
25,855
  
$
28,504
  
$
25,855