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Product Warranties (Tables)
 9 Months Ended
Sep. 30, 2019
Product Warranties Disclosures [Abstract]  
Summary of Changes in Product Warranties Reserve
The following table reflects the changes in our Warranty Reserve during the three and nine months ended September 30, 2019 and 2018:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2019
 
2018
 
2019
 
2018
Warranty reserve, beginning of period
 
$
100,659

 
$
99,702

 
$
103,700

 
$
94,513

Provision
 
20,217

 
15,900

 
48,486

 
43,644

Payments
 
(17,205
)
 
(15,771
)
 
(48,515
)
 
(38,326
)
Warranty reserve, end of period
 
$
103,671

 
$
99,831

 
$
103,671

 
$
99,831