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Product Warranties (Tables)
 9 Months Ended
Sep. 29, 2018
Product Warranties Disclosures [Abstract]  
Activity Associated with Warranty Obligations
The following table summarizes when these estimated settlements are expected to be paid (in thousands):
 
September 29,
2018
 
December 30,
2017
Current - in the next twelve months
$
9,372

 
$
9,524

Long-term - beyond one year
6,059

 
5,864

Total estimated settlements
$
15,431

 
$
15,388

Activity associated with warranty obligations was as follows (in thousands):
 
Nine Months Ended
 
September 29,
2018
 
September 30,
2017
Balance at beginning of period
$
15,388

 
$
15,250

Accruals for warranties issued during period
22,130

 
15,197

Adjustments related to pre-existing warranties
116

 
(298
)
Settlements made during the period
(22,203
)
 
(15,424
)
Balance at end of period
$
15,431

 
$
14,725