Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2015	Dec. 30, 2014	Dec. 31, 2013
Revenue:
Restaurant revenue	$ 450,482	$ 398,993	$ 347,140
Franchising royalties and fees	4,969	4,748	3,784
Total revenue	455,451	403,741	350,924
Restaurant operating costs (exclusive of depreciation and amortization shown separately below):
Cost of sales	120,455	107,217	91,892
Labor	143,145	120,492	104,040
Occupancy	50,300	42,540	35,173
Other restaurant operating costs	63,549	52,580	44,078
General and administrative	37,244	31,394	35,893
Depreciation and amortization	27,802	24,787	20,623
Pre-opening	4,407	4,425	3,809
Restaurant impairments, closure costs and asset disposals	29,616	1,391	1,164
Total costs and expenses	476,518	384,826	336,672
(Loss) income from operations	(21,067)	18,915	14,252
Debt extinguishment expense	0	0	624
Interest expense	1,432	365	2,196
(Loss) income before income taxes	(22,499)	18,550	11,432
(Benefit) provision for income taxes	(8,734)	7,122	4,767
Net (loss) income	$ (13,765)	$ 11,428	$ 6,665
Earnings per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ (0.48)	$ 0.38	$ 0.25
Diluted (USD per share)	$ (0.48)	$ 0.37	$ 0.24
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	28,938,901	29,717,304	26,406,904
Diluted (in shares)	28,938,901	31,001,099	27,688,629