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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Warranty Liabilities
The activity in the accrued warranty liabilities account was as follows (in thousands): 
 
Six Months Ended
 
June 30,
2018
 
July 1,
2017
Balance at beginning of year
$
9,320

 
$
8,633

Additions charged to costs and expenses for current-year sales
6,106

 
4,243

Deductions from reserves
(5,790
)
 
(3,665
)
Changes in liability for pre-existing warranties during the current year, including expirations
132

 
(55
)
Balance at end of period
$
9,768

 
$
9,156