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Commitments and Contingencies (Tables)
 9 Months Ended
Oct. 03, 2015
Commitments and Contingencies Disclosure [Abstract]  
Sales Returns
The activity in the sales returns liability account was as follows (in thousands):
 
Nine Months Ended
 
October 3,
2015
 
September 27,
2014
Balance at beginning of year
$
15,262

 
$
9,433

Additions that reduce net sales
67,944

 
55,047

Deductions from reserves
(63,893
)
 
(50,074
)
Balance at end of period
$
19,313

 
$
14,406
Warranty Liabilities
The activity in the accrued warranty liabilities account was as follows (in thousands): 
 
Nine Months Ended
 
October 3,
2015
 
September 27,
2014
Balance at beginning of year
$
5,824

 
$
4,153

Additions charged to costs and expenses for current-year sales
7,514

 
6,119

Deductions from reserves
(4,995
)
 
(5,434
)
Changes in liability for pre-existing warranties during the current year, including expirations
1,426

 
268

Balance at end of period
$
9,769

 
$
5,106