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Allowance for Doubtful Accounts (Tables)
 9 Months Ended
Sep. 24, 2016
Receivables [Abstract]  
Reconciliation of Changes in Allowance for Doubtful Accounts
A reconciliation of the changes in our allowance for doubtful accounts receivable for the nine months ended September 24, 2016 and September 26, 2015, respectively, is as follows (in thousands):

 
 
September 24,
2016
 
September 26,
2015
Balance at beginning of period
$
284

 
$
266

Additions
62

 
—

Reductions
(39
)
 
(11
)
Balance at end of period
$
307

 
$
255