Consolidated Statements Of Operations And Comprehensive Loss - USD ($)	3 Months Ended		6 Months Ended
	Jul. 02, 2017	Jul. 03, 2016	Jul. 02, 2017	Jul. 03, 2016
Revenues:
Restaurant sales	$ 279,478,000	$ 241,368,000	$ 519,330,000	$ 463,887,000
Costs and expenses:
Cost of sales	78,724,000	62,117,000	142,960,000	121,137,000
Restaurant wages and related expenses	87,948,000	73,545,000	169,019,000	145,628,000
Restaurant rent expense	18,892,000	16,118,000	36,489,000	31,996,000
Other restaurant operating expenses	41,910,000	37,316,000	81,105,000	73,005,000
Advertising expense	11,431,000	10,770,000	21,332,000	19,898,000
General and administrative	14,411,000	14,355,000	29,987,000	27,561,000
Depreciation and amortization	13,366,000	11,486,000	26,517,000	22,543,000
Impairment and other lease charges	432,000	286,000	963,000	508,000
Other expense	29,000	1,479,000	29,000	1,035,000
Total operating expenses	267,143,000	227,472,000	508,401,000	443,311,000
Income from operations	12,335,000	13,896,000	10,929,000	20,576,000
Interest expense	5,029,000	4,520,000	9,830,000	9,055,000
Income (loss) before income taxes	7,306,000	9,376,000	1,099,000	11,521,000
Provision (benefit) for income taxes	1,267,000	0.0	656,000	0
Net income (loss)	$ 6,039,000	$ 9,376,000	$ 443,000	$ 11,521,000
Basic and diluted net income (loss) per share	$ 0.13	$ 0.21	$ 0.01	$ 0.25
Basic weighted average common shares outstanding	35,415,416	35,117,463	35,399,820	35,109,610
Diluted weighted average common shares outstanding	44,941,819	44,818,528	44,980,576	44,849,707
Other comprehensive income (loss), net of tax:
Net income (loss)	$ 6,039,000	$ 9,376,000	$ 443,000	$ 11,521,000
Other comprehensive income (loss)	0	0	0	0
Comprehensive income (loss)	$ 6,039,000	$ 9,376,000	$ 443,000	$ 11,521,000