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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2019
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,
  
 
  
2019
    
2018
    
2019
    
2018
  
Balance, beginning of period
  
$
22,086
    
$
21,705
    
$
19,636
    
$
20,929
  
Liabilities accrued for current year sales
    
26,112
      
25,748
      
76,791
      
70,126
  
Settlements of warranty claims
    
(27,573
)
    
(23,396
)
    
(75,802
)
    
(66,998
)
Balance, end of period
  
$
20,625
    
$
24,057
    
$
20,625
    
$
24,057