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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 30, 2014
Dec. 31, 2013
Condensed Consolidated Balance Sheets    
Receivables, allowance for doubtful accounts (in dollars) $ 10us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 4us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Property and equipment, accumulated depreciation (in dollars) $ 347,222us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment $ 304,536us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Preferred stock, par value (in dollars per share) $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value (in dollars per share) $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 69,628,781us-gaap_CommonStockSharesIssued 70,352,257us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 69,628,781us-gaap_CommonStockSharesOutstanding 70,352,257us-gaap_CommonStockSharesOutstanding