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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 29, 2018
Commitments and Contingencies Disclosure [Abstract]  
Warranty Liabilities
The activity in the accrued warranty liabilities account was as follows (in thousands): 
 
Nine Months Ended
 
September 29,
2018
 
September 30,
2017
Balance at beginning of year
$
9,320

 
$
8,633

Additions charged to costs and expenses for current-year sales
9,275

 
8,627

Deductions from reserves
(8,461
)
 
(6,625
)
Changes in liability for pre-existing warranties during the current year, including expirations
177

 
(708
)
Balance at end of period
$
10,311

 
$
9,927