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Condensed Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Income Statement [Abstract]    
Revenues $ 174,292us-gaap_SalesRevenueNet $ 157,387us-gaap_SalesRevenueNet
Costs and expenses:    
Operating 119,858us-gaap_OperatingCostsAndExpenses 109,231us-gaap_OperatingCostsAndExpenses
Selling 32,656us-gaap_SellingAndMarketingExpense 29,059us-gaap_SellingAndMarketingExpense
General and administrative 15,132us-gaap_GeneralAndAdministrativeExpense 13,899us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization 10,661us-gaap_DepreciationDepletionAndAmortization 9,900us-gaap_DepreciationDepletionAndAmortization
(Gain)/loss on sale of assets, net (30)us-gaap_GainLossOnDispositionOfAssets 23us-gaap_GainLossOnDispositionOfAssets
Costs and expenses 178,277us-gaap_CostsAndExpenses 162,112us-gaap_CostsAndExpenses
Loss from operations (3,985)us-gaap_OperatingIncomeLoss (4,725)us-gaap_OperatingIncomeLoss
Other income (expense):    
Interest expense (790)us-gaap_InterestExpense (719)us-gaap_InterestExpense
Interest income 63us-gaap_InvestmentIncomeInterest 69us-gaap_InvestmentIncomeInterest
Other, net (827)us-gaap_OtherNonoperatingIncomeExpense (805)us-gaap_OtherNonoperatingIncomeExpense
Loss before income taxes (5,539)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (6,180)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax benefits (2,011)us-gaap_IncomeTaxExpenseBenefit (2,169)us-gaap_IncomeTaxExpenseBenefit
Net loss $ (3,528)us-gaap_NetIncomeLoss $ (4,011)us-gaap_NetIncomeLoss
Net income per share:    
Net loss per share--basic and diluted $ (0.27)us-gaap_EarningsPerShareBasicAndDiluted $ (0.29)us-gaap_EarningsPerShareBasicAndDiluted
Weighted-average shares outstanding:    
Basic 13,311us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 13,606us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted 13,779us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 14,009us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Weighted-average shares outstanding--basic and diluted 13,311us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 13,606us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Dividends declared per share $ 0.050us-gaap_CommonStockDividendsPerShareDeclared $ 0.045us-gaap_CommonStockDividendsPerShareDeclared