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Product Warranty Liabilities (Tables)
 3 Months Ended
Mar. 31, 2018
Guarantees [Abstract]  
Summary of Activity in Product Warranty Liabilities
The following table summarizes the activity in the Company’s product warranty liabilities:
 
2018
 
2017
Reserve at beginning of year
$
12,093

 
$
10,634

Additions
3,844

 
2,324

Payments
(2,743
)
 
(2,030
)
Reserve at March 31
$
13,194

 
$
10,928