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Product Warranties (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2019 and 2018:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2019
 
2018
 
2019
 
2018
Warranty reserve, beginning of period
 
$
102,852

 
$
95,606

 
$
103,700

 
$
94,513

Provision
 
16,446

 
16,217

 
28,269

 
27,744

Payments
 
(18,639
)
 
(12,121
)
 
(31,310
)
 
(22,555
)
Warranty reserve, end of period
 
$
100,659

 
$
99,702

 
$
100,659

 
$
99,702