Consolidated Statements Of Operations And Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Restaurant sales	$ 1,088,532	$ 943,583	$ 859,004
Costs and expenses:
Cost of sales	304,593	250,112	240,322
Restaurant wages and related expenses	350,054	297,766	267,950
Restaurant rent expense	75,948	64,814	58,096
Other restaurant operating expenses	166,786	148,946	135,874
Advertising expense	44,677	41,299	32,242
General and administrative	60,348	54,956	50,515
Depreciation and amortization	54,159	47,295	39,845
Impairment and other lease charges	2,827	2,355	3,078
Other expense (income)	(333)	338	(126)
Total operating expenses	1,059,059	907,881	827,796
Income (loss) from operations	29,473	35,702	31,208
Interest Expense	21,710	18,315	18,569
Loss on extinguishment of debt	0	0	12,635
Income (loss) before income taxes	7,763	17,387	4
Provision (benefit) for income taxes	604	(28,085)	0
Net income (loss)	$ 7,159	$ 45,472	$ 4
Basic and diluted net income (loss) per share	$ 0.16	$ 1.01	$ 0.00
Basic weighted average common shares outstanding	35,416,531	35,178,329	34,958,847
Diluted weighted average common shares outstanding	44,976,514	44,851,345	44,623,251
Other comprehensive income (loss), net of tax:
Net income (loss)	$ 7,159	$ 45,472	$ 4
Change in postretirement benefit obligations, net of tax	(7)	(868)	22
Comprehensive income (loss)	$ 7,152	$ 44,604	$ 26