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

 
$
7,450

Accruals
 
1,834

 
1,470

Payments
 
(2,249
)
 
(2,269
)
Balance, end of period
 
$
5,702

 
$
6,651