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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Warranty Liabilities
The activity in the accrued warranty liabilities account was as follows (in thousands): 
 
Three Months Ended
 
March 31,
2018
 
April 1,
2017
Balance at beginning of year
$
9,320

 
$
8,633

Additions charged to costs and expenses for current-year sales
3,500

 
2,718

Deductions from reserves
(3,271
)
 
(2,049
)
Changes in liability for pre-existing warranties during the current year, including expirations
(77
)
 
(57
)
Balance at end of period
$
9,472

 
$
9,245