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Product Warranties (Tables)
 6 Months Ended
Jul. 01, 2017
Product Warranties Disclosures [Abstract]  
Activity Associated with Warranty Obligations
The following table summarizes when these estimated settlements are expected to be paid (in thousands):
 
July 1,
2017
 
December 31,
2016
Current - in the next twelve months
$
6,823

 
$
6,975

Long-term - beyond one year
8,403

 
8,275

 
$
15,226

 
$
15,250

Activity associated with warranty obligations was as follows (in thousands):
 
 
Six Months Ended
 
 
July 1,
2017
 
July 2,
2016
Balance at beginning of period
 
$
15,250

 
$
16,227

Accruals for warranties issued during period
 
11,276

 
10,159

Adjustments related to pre-existing warranties
 
32

 
276

Settlements made during the period
 
(11,332
)
 
(10,586
)
Balance at end of period
 
$
15,226

 
$
16,076