Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 30, 2014	Dec. 31, 2013	Jan. 01, 2013
Revenue:
Restaurant revenue	$ 398,993us-gaap_FoodAndBeverageRevenue	$ 347,140us-gaap_FoodAndBeverageRevenue	$ 297,264us-gaap_FoodAndBeverageRevenue
Franchise royalties and fees	4,748us-gaap_FranchiseRevenue	3,784us-gaap_FranchiseRevenue	3,146us-gaap_FranchiseRevenue
Total revenue	403,741us-gaap_SalesRevenueNet	350,924us-gaap_SalesRevenueNet	300,410us-gaap_SalesRevenueNet
Restaurant operating costs (exclusive of depreciation and amortization, shown separately below):
Cost of sales	107,217us-gaap_FoodAndBeverageCostOfSales	91,892us-gaap_FoodAndBeverageCostOfSales	78,997us-gaap_FoodAndBeverageCostOfSales
Labor	120,492us-gaap_CostOfGoodsSoldDirectLabor	104,040us-gaap_CostOfGoodsSoldDirectLabor	89,435us-gaap_CostOfGoodsSoldDirectLabor
Occupancy	42,540us-gaap_OccupancyNet	35,173us-gaap_OccupancyNet	29,323us-gaap_OccupancyNet
Other restaurant operating costs	52,580us-gaap_OtherCostAndExpenseOperating	44,078us-gaap_OtherCostAndExpenseOperating	36,380us-gaap_OtherCostAndExpenseOperating
General and administrative	31,394us-gaap_GeneralAndAdministrativeExpense	35,893us-gaap_GeneralAndAdministrativeExpense	29,081us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	24,787	20,623	16,719
Pre-opening	4,425us-gaap_PreOpeningCosts	3,809us-gaap_PreOpeningCosts	3,145us-gaap_PreOpeningCosts
Asset disposals, closure costs and restaurant impairments	1,391	1,164	1,278
Total costs and expenses	384,826us-gaap_CostsAndExpenses	336,672us-gaap_CostsAndExpenses	284,358us-gaap_CostsAndExpenses
Income from operations	18,915us-gaap_OperatingIncomeLoss	14,252us-gaap_OperatingIncomeLoss	16,052us-gaap_OperatingIncomeLoss
Debt extinguishment expense	0	624	2,646
Interest expense	365us-gaap_InterestExpense	2,196us-gaap_InterestExpense	5,028us-gaap_InterestExpense
Income before income taxes	18,550	11,432	8,378
Provision for income taxes	7,122us-gaap_IncomeTaxExpenseBenefit	4,767us-gaap_IncomeTaxExpenseBenefit	3,215us-gaap_IncomeTaxExpenseBenefit
Net income	$ 11,428us-gaap_NetIncomeLoss	$ 6,665us-gaap_NetIncomeLoss	$ 5,163us-gaap_NetIncomeLoss
Earnings per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ 0.38us-gaap_EarningsPerShareBasic	$ 0.25us-gaap_EarningsPerShareBasic	$ 0.22us-gaap_EarningsPerShareBasic
Diluted (USD per share)	$ 0.37us-gaap_EarningsPerShareDiluted	$ 0.24us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	29,717,304	26,406,904	23,238,984
Diluted (in shares)	31,001,099	27,688,629	23,265,542

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.