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Product Warranties (Tables)
 12 Months Ended
Dec. 31, 2018
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability Changes in our product warranty obligations were as follows (in thousands):
 
2018
 
2017
 
2016
Balance, January 1
$
6,117

 
$
7,450

 
$
8,545

Accruals
3,884

 
3,008

 
2,480

Payments
(4,426
)
 
(4,341
)
 
(3,575
)
Balance, December 31
$
5,575

 
$
6,117

 
$
7,450