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Product Warranties (Tables)
 9 Months Ended
Sep. 30, 2017
Product Warranties Disclosures [Abstract]  
Summary of Changes in Product Warranties Reserve
The following table reflects the changes in the Company’s Warranty Reserve during the three and nine months ended September 30, 2017 and 2016:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2017
 
2016
 
2017
 
2016
Warranty reserve, beginning of period
 
$
95,394

 
$
87,953

 
$
93,895

 
$
87,407

Provision
 
12,940

 
11,622

 
35,107

 
33,331

Payments
 
(11,677
)
 
(11,551
)
 
(32,345
)
 
(32,714
)
Warranty reserve, end of period
 
$
96,657

 
$
88,024

 
$
96,657

 
$
88,024