Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Apr. 01, 2014
Revenue:
Restaurant revenue	$ 104,782us-gaap_FoodAndBeverageRevenue	$ 88,448us-gaap_FoodAndBeverageRevenue
Franchising royalties and fees	979us-gaap_FranchiseRevenue	1,071us-gaap_FranchiseRevenue
Total revenue	105,761us-gaap_SalesRevenueNet	89,519us-gaap_SalesRevenueNet
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of sales	27,812us-gaap_FoodAndBeverageCostOfSales	23,848us-gaap_FoodAndBeverageCostOfSales
Labor	33,029us-gaap_CostOfGoodsSoldDirectLabor	27,198us-gaap_CostOfGoodsSoldDirectLabor
Occupancy	12,218us-gaap_OccupancyNet	9,865us-gaap_OccupancyNet
Other restaurant operating costs	14,717us-gaap_OtherCostAndExpenseOperating	12,206us-gaap_OtherCostAndExpenseOperating
General and administrative	8,418us-gaap_GeneralAndAdministrativeExpense	7,009us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	6,919	5,610
Pre-opening	880us-gaap_PreOpeningCosts	1,113us-gaap_PreOpeningCosts
Restaurant impairment, asset disposals and closure costs	6,086	214
Total costs and expenses	110,079us-gaap_CostsAndExpenses	87,063us-gaap_CostsAndExpenses
(Loss) income from operations	(4,318)us-gaap_OperatingIncomeLoss	2,456us-gaap_OperatingIncomeLoss
Interest expense	229us-gaap_InterestExpense	20us-gaap_InterestExpense
(Loss) income before income taxes	(4,547)	2,436
(Benefit) provision for income taxes	(1,795)us-gaap_IncomeTaxExpenseBenefit	1,012us-gaap_IncomeTaxExpenseBenefit
Net (loss) income	$ (2,752)us-gaap_NetIncomeLoss	$ 1,424us-gaap_NetIncomeLoss
Earnings per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ (0.09)us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic
Diluted (USD per share)	$ (0.09)us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	29,843,204	29,606,321
Diluted (in shares)	29,843,204	31,059,324

The gains and losses included in earnings resulting from the sale or disposal of tangible assets, asset impairment charges resulting from the write down of assets from their carrying value to their fair value, and costs incurred associated with an exit or disposal activity other than for a discontinued operations. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, but excludes costs associated with the retirement of a long-lived asset.

No definition available.