Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2018	Dec. 27, 2017	Dec. 28, 2016
Revenue
Total revenue	$ 435,828	$ 401,701	$ 380,123
Cost of operations
Food and paper costs	111,142	109,898	107,218
Labor and related expenses	112,417	106,584	97,471
Occupancy and other operating expenses	91,385	85,631	78,263
Gain on recovery of insurance proceeds, lost profits	0	0	(502)
Company restaurant expenses	314,944	302,113	282,450
General and administrative expenses	50,261	38,523	34,661
Legal settlements	36,258	0	0
Franchise expenses	24,429	3,335	3,823
Depreciation and amortization	17,825	18,128	16,053
Loss on disposal of assets	278	799	674
Expenses related to fire loss	0	0	48
Gain on recovery of insurance proceeds, property, equipment and expenses	0	0	(741)
Recovery of securities lawsuits related legal expenses	(8,356)	(1,666)	0
Asset impairment and closed-store reserves	9,650	33,645	8,554
Total expenses	445,289	394,877	345,522
Gain on disposition of restaurants	0	0	28
(Loss) income from operations	(9,461)	6,824	34,629
Interest expense—net of interest income of $12, $25, and $28 for the years ended December 26, 2018, December 27, 2017, and December 28, 2016, respectively	3,502	3,278	3,155
Income tax receivable agreement (income) expense	(761)	(5,570)	352
(Loss) income before provision for income taxes	(12,202)	9,116	31,122
(Benefit) provision for income taxes	(3,208)	497	12,783
Net (loss) income	$ (8,994)	$ 8,619	$ 18,339
Net (loss) income per share:
Basic (usd per share)	$ (0.23)	$ 0.22	$ 0.48
Diluted (usd per share)	$ (0.23)	$ 0.22	$ 0.47
Weighted average shares used in computing net (loss) income per share:
Basic (shares)	38,574,553	38,453,347	38,357,805
Diluted (shares)	38,574,553	39,086,676	39,026,950
Company-operated restaurant revenue
Revenue
Total revenue	$ 388,835	$ 376,615	$ 355,468
Franchise revenue
Revenue
Total revenue	25,771	25,086	24,655
Franchise advertising fee revenue
Revenue
Total revenue	$ 21,222	$ 0	$ 0