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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2018
Commitments and Contingencies [Abstract]  
Changes in Product Warranties
The following table provides the changes in our product warranties (in thousands):

  
Three Months Ended
March 31,
 
  
2018
  
2017
 
       
Balance, beginning of period
 
$
20,929
  
$
24,072
 
Liabilities accrued for current year sales
  
21,242
   
25,730
 
Settlements of warranty claims
  
(21,611
)
  
(24,193
)
Balance, end of period
 
$
20,560
  
$
25,609