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Product Warranties (Tables)
 9 Months Ended
Sep. 30, 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):
 
September 30,
2017
 
December 31,
2016
Current - in the next twelve months
$
8,958

 
$
6,975

Long-term - beyond one year
5,767

 
8,275

 
$
14,725

 
$
15,250

Activity associated with warranty obligations was as follows (in thousands):
 
 
Nine Months Ended
 
 
September 30,
2017
 
October 1,
2016
Balance at beginning of period
 
$
15,250

 
$
16,227

Accruals for warranties issued during period
 
15,197

 
14,762

Adjustments related to pre-existing warranties
 
(298
)
 
359

Settlements made during the period
 
(15,424
)
 
(15,379
)
Balance at end of period
 
$
14,725

 
$
15,969