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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2018
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,
 
  
2018
  
2017
  
2018
  
2017
 
Balance, beginning of period
 
$
20,560
  
$
25,609
  
$
20,929
  
$
24,072
 
Liabilities accrued for current year sales
  
23,136
   
25,693
   
44,378
   
51,423
 
Settlements of warranty claims
  
(21,991
)
  
(26,774
)
  
(43,602
)
  
(50,967
)
Balance, end of period
 
$
21,705
  
$
24,528
  
$
21,705
  
$
24,528