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Product Warranties (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2018 and 2017:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
Warranty reserve, beginning of period
 
$
99,702

 
$
95,394

 
$
94,513

 
$
93,895

Provision
 
15,900

 
12,940

 
43,644

 
35,107

Payments
 
(15,771
)
 
(11,677
)
 
(38,326
)
 
(32,345
)
Warranty reserve, end of period
 
$
99,831

 
$
96,657

 
$
99,831

 
$
96,657