Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2017	Mar. 22, 2016
Revenue:
Company restaurant sales	$ 101,222	$ 93,550
Franchise revenue	3,613	3,329
Franchise sublease income	510	524
Total revenue	105,345	97,403
Restaurant operating expenses:
Food and paper costs	27,918	26,129
Labor and related expenses	33,221	29,784
Occupancy and other operating expenses	20,718	20,123
General and administrative	9,305	8,292
Depreciation and amortization	5,103	5,486
Occupancy and other - franchise subleases	481	503
Pre-opening costs	26	93
Restaurant closure charges, net	9	178
(Gain) loss on disposal of assets, net	(49)	75
Total operating expenses	96,732	90,663
Income from operations	8,613	6,740
Other expense
Interest expense	1,543	1,472
Transaction-related costs	0	65
Total other expense	1,543	1,537
Income from operations before provision for income taxes	7,070	5,203
Provision for income taxes	2,832	2,142
Net income	4,238	3,061
Other comprehensive loss:
Change in fair value of interest rate cap, net of tax	(88)	0
Total other comprehensive loss	(88)	0
Comprehensive income	$ 4,150	$ 3,061
Earnings per share:
Basic (in dollars per share)	$ 0.11	$ 0.08
Diluted (in dollars per share)	$ 0.10	$ 0.08
Weighted-average shares outstanding
Basic (in shares)	39,003,935	38,798,014
Diluted (in shares)	40,375,061	38,798,301