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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2021
Commitments and Contingencies [Abstract]  
Changes in Product Warranties
The following table provides the changes in our product warranties (in thousands):

     Three Months Ended
     Nine Months Ended
 
 
 
September 30,
   
September 30,
 
 
 
2021
   
2020
   
2021
   
2020
 
Balance, beginning of period
 
$
18,213
   
$
17,760
   
$
17,663
   
$
17,175
 
Liabilities accrued for current year sales
   
27,381
     
26,954
     
72,720
     
71,816
 
Settlements of warranty claims
   
(26,730
)
   
(24,195
)
   
(71,519
)
   
(68,472
)
Balance, end of period
 
$
18,864
   
$
20,519
   
$
18,864
   
$
20,519