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Commitments and Contingencies (Tables)
 3 Months Ended
Apr. 01, 2017
Commitments and Contingencies Disclosure [Abstract]  
Sales Returns
The activity in the sales returns liability account was as follows (in thousands):
 
Three Months Ended
 
April 1,
2017
 
April 2,
2016
Balance at beginning of year
$
15,222

 
$
20,562

Additions that reduce net sales
21,184

 
23,636

Deductions from reserves
(18,205
)
 
(21,288
)
Balance at end of period
$
18,201

 
$
22,910
Warranty Liabilities
The activity in the accrued warranty liabilities account was as follows (in thousands): 
 
Three Months Ended
 
April 1,
2017
 
April 2,
2016
Balance at beginning of year
$
8,633

 
$
10,028

Additions charged to costs and expenses for current-year sales
2,718

 
3,585

Deductions from reserves
(2,049
)
 
(3,272
)
Changes in liability for pre-existing warranties during the current year, including expirations
(57
)
 
(574
)
Balance at end of period
$
9,245

 
$
9,767