Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2019	Sep. 26, 2018	Sep. 25, 2019	Sep. 26, 2018
Revenue
Total revenue	$ 112,067	$ 112,178	$ 334,784	$ 329,567
Cost of operations
Food and paper cost	27,512	28,349	82,550	84,265
Labor and related expenses	29,292	29,164	88,140	84,682
Occupancy and other operating expenses	23,844	24,187	70,103	69,019
Company restaurant expenses	80,648	81,700	240,793	237,966
General and administrative expenses	9,539	12,186	30,235	37,862
Franchise expenses	7,006	6,342	20,692	18,424
Depreciation and amortization	4,343	4,507	13,558	13,063
Loss on disposal of assets	35	140	213	193
Recovery of securities lawsuits related legal expenses	0	(2,036)	(10,000)	(6,099)
Asset impairment and closed-store reserves	367	(153)	1,241	6,629
Gain (Loss) on Disposition of Business	11	0	5,062	0
Total expenses	101,949	102,686	301,794	308,038
Income from operations	10,118	9,492	32,990	21,529
Interest expense, net	973	840	2,754	2,688
Income tax receivable agreement income	(197)	(571)	(120)	(777)
Income before provision for income taxes	9,342	9,223	30,356	19,618
Provision for income taxes	2,940	2,388	8,954	5,202
Net income	$ 6,402	$ 6,835	$ 21,402	$ 14,416
Net income per share
Basic (usd per share)	$ 0.18	$ 0.18	$ 0.57	$ 0.37
Diluted (usd per share)	$ 0.18	$ 0.17	$ 0.56	$ 0.37
Weighted-average shares used in computing net income per share
Basic (shares)	35,859,502	38,602,658	37,484,372	38,516,792
Diluted (shares)	36,397,368	39,205,090	38,173,097	39,102,130
Company-operated restaurant revenue
Revenue
Total revenue	$ 99,052	$ 100,024	$ 296,341	$ 294,204
Franchise revenue
Revenue
Total revenue	7,273	6,665	21,635	19,324
Franchise advertising fee revenue
Revenue
Total revenue	$ 5,742	$ 5,489	$ 16,808	$ 16,039