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Product Warranties (Tables)
 3 Months Ended
Mar. 31, 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):
 
March 31,
2018
 
December 30,
2017
Current - in the next twelve months
$
9,512

 
$
9,524

Long-term - beyond one year
5,926

 
5,864

Total estimated settlements
$
15,438

 
$
15,388

Activity associated with warranty obligations was as follows (in thousands):
 
Three Months Ended
 
March 31,
2018
 
April 1,
2017
Balance at beginning of period
$
15,388

 
$
15,250

Accruals for warranties issued during period
5,992

 
5,540

Adjustments related to pre-existing warranties
68

 
(116
)
Settlements made during the period
(6,010
)
 
(5,548
)
Balance at end of period
$
15,438

 
$
15,126