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Commitments and Contingencies (Tables)
 6 Months Ended
Jul. 04, 2015
Commitments and Contingencies Disclosure [Abstract]  
Sales Returns
The activity in the sales returns liability account was as follows (in thousands):
 
Six Months Ended
 
July 4,
2015
 
June 28,
2014
Balance at beginning of year
$
15,262

 
$
9,433

Additions that reduce net sales
40,076

 
32,923

Deductions from reserves
(42,659
)
 
(33,162
)
Balance at end of period
$
12,679

 
$
9,194
Warranty Liabilities
The activity in the accrued warranty liabilities account was as follows (in thousands): 
 
Six Months Ended
 
July 4,
2015
 
June 28,
2014
Balance at beginning of year
$
5,824

 
$
4,153

Additions charged to costs and expenses for current-year sales
4,869

 
3,237

Deductions from reserves
(4,177
)
 
(3,231
)
Changes in liability for pre-existing warranties during the current year, including expirations
421

 
274

Balance at end of period
$
6,937

 
$
4,433