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Product Warranties (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2018 and 2017:
 
 
Three Months Ended March 31,
 
 
2018
 
2017
Warranty reserve, beginning of period
 
$
94,513

 
$
93,895

Provision
 
11,527

 
8,961

Payments
 
(10,434
)
 
(9,353
)
Warranty reserve, end of period
 
$
95,606

 
$
93,503