Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2016	Dec. 30, 2015	Dec. 31, 2014
Revenue
Company-operated restaurant revenue	$ 355,468	$ 332,040	$ 322,516
Franchise revenue	24,655	23,017	22,345
Total revenue	380,123	355,057	344,861
Cost of operations
Food and paper costs	107,218	105,917	102,611
Labor and related expenses	97,471	84,231	80,646
Occupancy and other operating expenses	78,263	69,977	68,538
Gain on recovery of insurance proceeds, lost profits	(502)
Company restaurant expenses	282,450	260,125	251,795
General and administrative expenses	34,661	28,997	29,519
Franchise expenses	3,823	3,456	3,704
Depreciation and amortization	16,053	13,092	11,538
Loss on disposal of assets	674	471	646
Expenses related to fire loss	48
Gain on recovery of insurance proceeds, property, equipment and expenses	(741)
Asset impairment and closed-store reserves	8,554	92	1,033
Total expenses	345,522	306,233	298,235
Gain on disposition of restaurants	28		2,658
Income from operations	34,629	48,824	49,284
Interest expense—net of interest income of $28, $49, and $63 for the years ended December 28, 2016, December 30, 2015, and December 31, 2014, respectively	3,155	3,707	18,062
Early extinguishment of debt			9,718
Expenses related to selling shareholders		50	667
Income tax receivable agreement expense	352	156	41,382
Income (loss) before (provision) benefit for income taxes	31,122	44,911	(20,545)
(Provision) benefit for income taxes	(12,783)	(20,857)	63,008
Net income	$ 18,339	$ 24,054	$ 42,463
Net income per share:
Basic	$ 0.48	$ 0.63	$ 1.32
Diluted	$ 0.47	$ 0.62	$ 1.24
Weighted average shares used in computing net income per share:
Basic	38,357,805	37,949,316	32,285,484
Diluted	39,026,950	39,039,558	34,346,241