Consolidated Statements Of Income And Comprehensive Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 25, 2012		Dec. 27, 2011
Consolidated Statements Of Income And Comprehensive Income [Abstract]
Revenues	$ 271,806		$ 232,435		$ 198,625
Costs and expenses:
Costs of sales	82,209		71,093		60,743
Restaurant operating expenses	121,825		100,143		86,311
Marketing and advertising costs	5,663		4,682		4,246
Pre-opening costs	3,758		4,058		3,018
General and administrative costs	17,421		13,449		10,640
Management and accounting fees paid to related party			1,252		3,399
Asset advisory agreement termination fee			3,000
Secondary public offering costs	1,024
Public offering transaction bonuses	8,355		1,462
Non-cash impairment charges	2,360
Depreciation and amortization	11,300		8,675		6,998
Operating income	17,891		24,621		23,270
Other income (expense), net:
Interest expense	(72)		(2,920)		(6,355)
Write-off of debt issuance costs			(1,649)		(2,501)
Other, net	(51)		113		(114)
Income from continuing operations before income taxes	17,768		20,165		14,300
Income tax expense	5,556		5,592		4,653
Income from continuing operations	12,212		14,573		9,647
Discontinued operations, net of income tax benefit			(819)		(674)
Net income	12,212		13,754		8,973
Basic income (loss) per common share:
Continuing operations	$ 0.51		$ 0.71		$ 0.54
Discontinued operations			$ (0.04)		$ (0.04)
Basic income per share	$ 0.51		$ 0.67		$ 0.50
Diluted income (loss) per common share:
Continuing operations	$ 0.51		$ 0.71		$ 0.54
Discontinued operations			$ (0.04)		$ (0.04)
Diluted income per share	$ 0.51		$ 0.67		$ 0.50
Shares used in computing net income (loss) per common share:
Basic	23,779,782	[1]	20,432,579	[1]	17,994,667	[1]
Diluted	23,852,200		20,432,579		17,994,667
Comprehensive income	$ 12,212		$ 13,754		$ 8,973

[1] The weighted average number of shares of common stock outstanding reflects the effect of the Conversion. (See Note 1).