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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 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
June 30,
  
Six Months Ended
June 30,
 
  
2016
  
2015
  
2016
  
2015
 
Balance, beginning of period
 
$
26,404
  
$
19,985
  
$
23,395
  
$
19,328
 
Liabilities accrued for current year sales
  
25,418
   
25,951
   
47,999
   
46,987
 
Settlements of warranty claims
  
(24,876
)
  
(20,788
)
  
(44,448
)
  
(41,167
)
Balance, end of period
 
$
26,946
  
$
25,148
  
$
26,946
  
$
25,148