Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2018	Mar. 29, 2017
Revenue
Company-operated restaurant revenue	$ 94,553	$ 93,449
Franchise revenue	6,106	6,322
Franchise advertising fee revenue	5,097	0
Total revenue	105,756	99,771
Cost of operations
Food and paper cost	27,235	27,072
Labor and related expenses	27,662	26,833
Occupancy and other operating expenses	21,919	20,542
Company restaurant expenses	76,816	74,447
General and administrative expenses	13,202	9,733
Franchise expenses	5,832	817
Depreciation and amortization	4,212	4,317
Loss on disposal of assets	61	225
Recovery of securities lawsuits related legal expenses	(1,634)	0
Asset impairment and closed-store reserves	2,819	871
Total expenses	101,308	90,410
Income from operations	4,448	9,361
Interest expense, net of interest income of $8 and $5 for the quarters ended March 28, 2018 and March 29, 2017, respectively.	888	790
Income tax receivable agreement (income) expense	(918)	227
Income before provision for income taxes	4,478	8,344
Provision for income taxes	1,949	3,467
Net income	$ 2,529	$ 4,877
Net income per share
Basic (usd per share)	$ 0.07	$ 0.13
Diluted (usd per share)	$ 0.06	$ 0.12
Weighted-average shares used in computing net income per share
Basic (shares)	38,465,208	38,437,020
Diluted (shares)	38,987,351	39,079,007