Consolidated Statements Of Operations And Comprehensive Loss - USD ($)	3 Months Ended		6 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017
Revenues:
Restaurant sales	$ 303,050,000	$ 279,478,000	$ 574,636,000	$ 519,330,000
Costs and expenses:
Cost of sales	81,917,000	78,724,000	154,922,000	142,960,000
Restaurant wages and related expenses	96,954,000	87,948,000	188,098,000	169,019,000
Restaurant rent expense	19,879,000	18,892,000	39,853,000	36,489,000
Other restaurant operating expenses	44,589,000	41,910,000	87,428,000	81,105,000
Advertising expense	12,356,000	11,431,000	23,621,000	21,332,000
General and administrative (including stock-based compensation expense of $1,385, $903, $2,970 and $1,786 respectively)	16,020,000	14,411,000	32,156,000	29,987,000
Depreciation and amortization	14,621,000	13,366,000	28,871,000	26,517,000
Impairment and other lease charges	2,881,000	432,000	3,190,000	963,000
Other expense (income), net	0	(29,000)	0	(29,000)
Total operating expenses	289,217,000	267,143,000	558,139,000	508,401,000
Income from operations	13,833,000	12,335,000	16,497,000	10,929,000
Interest expense	5,917,000	5,029,000	11,843,000	9,830,000
Gain on bargain purchase (Note 2)	(208,000)	0	(230,000)	0
Income before income taxes	8,124,000	7,306,000	4,884,000	1,099,000
Provision for income taxes (Note 7)	336,000	1,267,000.0	198,000	656,000
Net income	$ 7,788,000	$ 6,039,000	$ 4,686,000	$ 443,000
Basic and diluted net income (loss) per share	$ 0.17	$ 0.13	$ 0.10	$ 0.01
Basic weighted average common shares outstanding	35,720,243	35,415,416	35,693,027	35,399,820
Diluted weighted average common shares outstanding	45,201,266	44,941,819	45,234,604	44,980,576
Other comprehensive income (loss), net of tax:
Net income	$ 7,788,000	$ 6,039,000	$ 4,686,000	$ 443,000
Other comprehensive income	0	0	0	0
Comprehensive income	$ 7,788,000	$ 6,039,000	$ 4,686,000	$ 443,000