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Receivables, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Dec. 27, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Customers, trade $ 49,279   $ 49,279   $ 46,422
Other receivables 4,984   4,984   4,552
Gross receivables 54,263   54,263   50,974
Less allowance for doubtful accounts (455)   (455)   (450)
Receivables, net 53,808   53,808   $ 50,524
Allowance for doubtful accounts [Abstract]          
Bad debt expense $ 51 $ 179 $ 110 $ 325