Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2017	Dec. 28, 2016	Dec. 30, 2015
Revenue
Company-operated restaurant revenue	$ 376,615	$ 355,468	$ 332,040
Franchise revenue	25,086	24,655	23,017
Total revenue	401,701	380,123	355,057
Cost of operations
Food and paper costs	109,898	107,218	105,917
Labor and related expenses	106,584	97,471	84,231
Occupancy and other operating expenses	85,631	78,263	69,977
Gain on recovery of insurance proceeds, lost profits	0	(502)	0
Company restaurant expenses	302,113	282,450	260,125
General and administrative expenses	38,523	34,661	28,997
Franchise expenses	3,335	3,823	3,456
Depreciation and amortization	18,128	16,053	13,092
Loss on disposal of assets	799	674	471
Expenses related to fire loss	0	48	0
Gain on recovery of insurance proceeds, property, equipment and expenses	0	(741)	0
Recovery of securities lawsuits related legal expenses	(1,666)	0	0
Asset impairment and closed-store reserves	33,645	8,554	92
Total expenses	394,877	345,522	306,233
Gain on disposition of restaurants	0	28	0
Income from operations	6,824	34,629	48,824
Interest expense—net of interest income of $25, $28, and $49 for the years ended December 27, 2017, December 28, 2016, and December 30, 2015, respectively	3,278	3,155	3,707
Expenses related to selling shareholders	0	0	50
Income tax receivable agreement (income) expense	(5,570)	352	156
Income before provision for income taxes	9,116	31,122	44,911
Provision for income taxes	(497)	(12,783)	(20,857)
Net income	$ 8,619	$ 18,339	$ 24,054
Net income per share:
Basic (usd per share)	$ 0.22	$ 0.48	$ 0.63
Diluted (usd per share)	$ 0.22	$ 0.47	$ 0.62
Weighted average shares used in computing net income per share:
Basic (shares)	38,453,347	38,357,805	37,949,316
Diluted (shares)	39,086,676	39,026,950	39,039,558