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Product Warranties (Tables)
 9 Months Ended
Sep. 30, 2018
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability Changes in our product warranty obligations were as follows (in thousands):
 
 
Nine Months Ended September 30,
 
 
2018
 
2017
Balance, beginning of period
 
$
6,117

 
$
7,450

Accruals
 
2,772

 
2,163

Payments
 
(3,183
)
 
(3,312
)
Balance, end of period
 
$
5,706

 
$
6,301