Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 25, 2014	Jun. 26, 2013	Jun. 25, 2014	Jun. 26, 2013
Revenue
Company-operated restaurant revenue	$ 81,358	$ 76,520	$ 157,571	$ 148,589
Franchise revenue	5,546	5,207	10,760	10,133
Total revenue	86,904	81,727	168,331	158,722
Cost of operations
Food and paper cost	25,930	24,207	49,953	46,903
Labor and related expenses	20,102	19,218	39,415	38,288
Occupancy and other operating expenses	16,945	15,874	32,989	31,398
Company restaurant expenses	62,977	59,299	122,357	116,589
General and administrative expenses	6,835	6,298	13,465	12,491
Franchise expenses	943	981	1,926	1,950
Depreciation and amortization	2,752	2,541	5,347	4,945
Loss on disposal of assets	215	391	491	581
Asset impairment and close-store reserves	340	36	393	101
Total expenses	74,062	69,546	143,979	136,657
Income from operations	12,842	12,181	24,352	22,065
Interest expense, net	5,703	9,800	11,326	19,580
Income before provision for income taxes	7,139	2,381	13,026	2,485
Provision for income taxes	(570)	(1,971)	(987)	(2,135)
Net income	$ 6,569	$ 410	$ 12,039	$ 350
Net income per share
Basic	$ 0.23	$ 0.01	$ 0.42	$ 0.01
Diluted	$ 0.21	$ 0.01	$ 0.39	$ 0.01
Weighted-average shares used in computing net income per share
Basic	28,715,485	28,712,622	28,714,053	28,712,622
Diluted	30,596,998	28,999,093	30,595,565	28,999,093