Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2015	Sep. 30, 2014	Sep. 29, 2015	Sep. 30, 2014
Revenue:
Restaurant revenue	$ 116,151	$ 105,143	$ 334,767	$ 291,789
Franchising royalties and fees	1,177	1,073	3,555	3,406
Total revenue	117,328	106,216	338,322	295,195
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of sales	30,941	28,359	88,616	78,533
Labor	37,687	31,884	105,865	88,410
Occupancy	12,911	11,004	37,609	31,114
Other restaurant operating costs	17,003	14,532	46,878	38,981
General and administrative	9,384	7,545	27,034	22,806
Depreciation and amortization	7,117	6,454	20,959	17,969
Pre-opening	1,108	1,142	3,150	3,282
Restaurant impairment, asset disposals and closure costs	16,479	251	22,815	658
Total costs and expenses	132,630	101,171	352,926	281,753
(Loss) income from operations	(15,302)	5,045	(14,604)	13,442
Interest expense	391	112	818	168
(Loss) income before income taxes	(15,693)	4,933	(15,422)	13,274
(Benefit) provision for income taxes	(5,872)	1,990	(5,911)	5,380
Net (loss) income	$ (9,821)	$ 2,943	$ (9,511)	$ 7,894
(Loss) earnings per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ (0.35)	$ 0.10	$ (0.32)	$ 0.27
Diluted (USD per share)	$ (0.35)	$ 0.10	$ (0.32)	$ 0.25
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	28,253,859	29,757,820	29,349,061	29,689,342
Diluted (in shares)	28,253,859	30,893,904	29,349,061	31,042,443