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Product Warranties (Tables)
6 Months Ended
Jun. 30, 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):
 
June 30,
2018
 
December 30,
2017
Current - in the next twelve months
$
9,635

 
$
9,524

Long-term - beyond one year
5,831

 
5,864

Total estimated settlements
$
15,466

 
$
15,388

Activity associated with warranty obligations was as follows (in thousands):
 
Six Months Ended
 
June 30,
2018
 
July 1,
2017
Balance at beginning of period
$
15,388

 
$
15,250

Accruals for warranties issued during period
12,219

 
11,276

Adjustments related to pre-existing warranties
93

 
32

Settlements made during the period
(12,234
)
 
(11,332
)
Balance at end of period
$
15,466

 
$
15,226