Condensed Consolidated Statements Of Income And Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 21, 2017	Mar. 22, 2016
Condensed Consolidated Statements Of Income And Comprehensive Income [Abstract]
Revenues	$ 83,890	$ 81,194
Costs and expenses:
Costs of sales	23,781	23,218
Restaurant operating expenses	40,851	38,626
Marketing and advertising costs	1,300	1,321
Pre-opening costs	389	94
General and administrative costs	6,311	5,750
Consulting project costs	2,036
Lease termination and closing costs	(2)	21
Depreciation and amortization	4,816	4,285
Operating income	4,408	7,879
Other income (expense), net:
Interest, net of capitalized interest	(10)	(31)
Other	(2)
Income before income taxes	4,396	7,848
Income tax expense	1,086	2,437
Net income	$ 3,310	$ 5,411
Basic earnings per common share	$ 0.14	$ 0.23
Diluted earnings per common share	$ 0.14	$ 0.23
Shares used in computing earnings per common share:
Basic	23,059,363	23,315,077
Diluted	23,276,542	23,398,115
Comprehensive income	$ 3,310	$ 5,411