Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Jan. 01, 2013	Jan. 03, 2012
Revenue:
Restaurant revenue	$ 347,140	$ 297,264	$ 253,467
Franchise royalties and fees	3,784	3,146	2,599
Total revenue	350,924	300,410	256,066
Restaurant operating costs (exclusive of depreciation and amortization, shown separately below):
Cost of sales	91,892	78,997	66,419
Labor	104,040	89,435	75,472
Occupancy	35,173	29,323	25,208
Other restaurant operating costs	44,078	36,380	32,031
General and administrative	35,893	29,081	26,463
Depreciation and amortization	20,623	16,719	14,501
Pre-opening	3,809	3,145	2,327
Asset disposals, closure costs and restaurant impairments	1,164	1,278	1,629
Total costs and expenses	336,672	284,358	244,050
Income from operations	14,252	16,052	12,016
Debt extinguishment expense	624	2,646	275
Interest expense	2,196	5,028	6,132
Income before income taxes	11,432	8,378	5,609
Provision for income taxes	4,767	3,215	1,780
Net income	$ 6,665	$ 5,163	$ 3,829
Earnings per share of Class A and Class B common stock, combined:
Basic (USD per share)	$ 0.25	$ 0.22	$ 0.16
Diluted (USD per share)	$ 0.24	$ 0.22	$ 0.16
Weighted average shares of Class A and Class B common stock outstanding, combined:
Basic (in shares)	26,406,904	23,238,984	23,237,698
Diluted (in shares)	27,688,629	23,265,542	23,237,698