Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Oct. 01, 2013	Sep. 30, 2014	Oct. 01, 2013
Revenue:
Restaurant revenue	$ 105,143	$ 87,864	$ 291,789	$ 256,744
Franchising royalties and fees	1,073	1,072	3,406	2,711
Total revenue	106,216	88,936	295,195	259,455
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of sales	28,359	23,127	78,533	67,524
Labor	31,884	26,345	88,410	77,464
Occupancy	11,004	8,870	31,114	25,824
Other restaurant operating costs	14,532	11,315	38,981	32,962
General and administrative	7,545	6,939	22,806	27,808
Depreciation and amortization	6,454	5,238	17,969	15,074
Pre-opening	1,142	1,183	3,282	2,873
Asset disposals, closure costs and restaurant impairments	251	339	658	837
Total costs and expenses	101,171	83,356	281,753	250,366
Income from operations	5,045	5,580	13,442	9,089
Interest expense	112	132	168	2,199
Income before income taxes	4,933	5,448	13,274	6,890
Provision for income taxes	1,990	2,183	5,380	2,633
Net income	$ 2,943	$ 3,265	$ 7,894	$ 4,257
Earnings per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ 0.10	$ 0.11	$ 0.27	$ 0.17
Diluted (USD per share)	$ 0.10	$ 0.11	$ 0.25	$ 0.16
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	29,757,820	29,399,650	29,689,342	25,382,805
Diluted (in shares)	30,893,904	31,063,213	31,042,443	26,528,004