Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2015	Jun. 25, 2014	Jul. 01, 2015	Jun. 25, 2014
Revenue
Company-operated restaurant revenue	$ 83,575	$ 81,358	$ 168,308	$ 157,571
Franchise revenue	5,879	5,546	11,572	10,760
Total revenue	89,454	86,904	179,880	168,331
Cost of operations
Food and paper cost	27,055	25,930	54,178	49,953
Labor and related expenses	21,089	20,102	42,671	39,415
Occupancy and other operating expenses	17,388	16,945	34,524	32,989
Company restaurant expenses	65,532	62,977	131,373	122,357
General and administrative expenses	6,405	6,835	13,890	13,465
Franchise expenses	840	943	1,695	1,926
Depreciation and amortization	3,200	2,752	6,346	5,347
Loss on disposal of assets	85	215	166	491
Asset impairment and close-store reserves	(190)	340	(139)	393
Total expenses	75,872	74,062	153,331	143,979
Income from operations	13,582	12,842	26,549	24,352
Interest expense, net	1,014	5,703	2,225	11,326
Expenses related to selling shareholders	50		50
Income tax receivable agreement expense	226		477
Income before provision for income taxes	12,292	7,139	23,797	13,026
Provision for income taxes	5,062	570	9,776	987
Net income	$ 7,230	$ 6,569	$ 14,021	$ 12,039
Net income per share
Basic	$ 0.19	$ 0.23	$ 0.37	$ 0.42
Diluted	$ 0.18	$ 0.22	$ 0.36	$ 0.39
Weighted-average shares used in computing net income per share
Basic	37,812,767	28,715,485	37,618,756	28,714,053
Diluted	39,085,206	30,372,281	39,002,974	30,595,565