Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 02, 2013	Jul. 03, 2012	Jul. 02, 2013	Jul. 03, 2012
Revenue:
Restaurant revenue	$ 88,362	$ 74,757	$ 168,880	$ 143,955
Franchising royalties and fees	877	737	1,639	1,427
Total revenue	89,239	75,494	170,519	145,382
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of sales	23,096	19,947	44,397	38,177
Labor	26,289	22,184	51,119	42,937
Occupancy	8,595	7,265	16,954	14,201
Other restaurant operating costs	11,575	9,711	22,635	19,264
General and administrative	12,646	6,217	19,881	12,659
Depreciation and amortization	5,035	4,099	9,836	7,831
Pre-opening	769	590	1,690	1,171
Asset disposals, closure costs and restaurant impairments	297	282	498	462
Total costs and expenses	88,302	70,295	167,010	136,702
Income from operations	937	5,199	3,509	8,680
Interest expense	1,014	1,492	2,067	2,776
Income (loss) before income taxes	(77)	3,707	1,442	5,904
Provision (benefit) for income taxes	(145)	1,527	450	2,433
Net income	$ 68	$ 2,180	$ 992	$ 3,471
Earnings per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ 0.00	$ 0.09	$ 0.04	$ 0.15
Diluted (USD per share)	$ 0.00	$ 0.09	$ 0.04	$ 0.15
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	23,509,781	23,238,984	23,374,383	23,238,984
Diluted (in shares)	24,189,814	23,244,680	23,979,011	23,242,831