Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 01, 2014	Jul. 02, 2013	Jul. 01, 2014	Jul. 02, 2013
Revenue:
Restaurant revenue	$ 98,197	$ 88,362	$ 186,646	$ 168,880
Franchising royalties and fees	1,262	877	2,333	1,639
Total revenue	99,459	89,239	188,979	170,519
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of sales	26,326	23,096	50,174	44,397
Labor	29,328	26,289	56,526	51,119
Occupancy	10,245	8,595	20,110	16,954
Other restaurant operating costs	12,243	10,567	24,449	21,647
General and administrative	8,251	13,654	15,261	20,869
Depreciation and amortization	5,905	5,035	11,515	9,836
Pre-opening	1,027	769	2,140	1,690
Asset disposals, closure costs and restaurant impairments	193	297	408	498
Total costs and expenses	93,518	88,302	180,583	167,010
Income from operations	5,941	937	8,396	3,509
Interest expense	36	1,014	56	2,067
Income before income taxes	5,905	(77)	8,340	1,442
Provision (benefit) for income taxes	2,378	(145)	3,389	450
Net income	$ 3,527	$ 68	$ 4,951	$ 992
Earnings per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ 0.12	$ 0.00	$ 0.17	$ 0.04
Diluted (USD per share)	$ 0.11	$ 0.00	$ 0.16	$ 0.04
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	29,703,884	23,509,781	29,655,102	23,374,383
Diluted (in shares)	31,063,774	24,189,814	31,061,722	23,979,011