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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Jun. 26, 2012
Dec. 27, 2011
Condensed Consolidated Balance Sheets    
Receivables, allowance for doubtful accounts (in dollars) $ 23 $ 39
Property and equipment, accumulated depreciation (in dollars) $ 250,883 $ 232,760
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 70,330,187 69,186,967
Common stock, shares outstanding 70,330,187 69,186,967