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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 27, 2016
Dec. 29, 2015
Consolidated Balance Sheets    
Receivables, allowance for doubtful accounts (in dollars) $ 33 $ 6
Property and equipment, accumulated depreciation (in dollars) 457,102 395,886
Intangible assets, accumulated amortization (in dollars) $ 11,753 $ 10,548
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 1,000,000 1,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 70,619,737 70,091,203
Common stock, shares outstanding 70,619,737 70,091,203