Unaudited Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 02, 2018	Oct. 03, 2017	Oct. 02, 2018	Oct. 03, 2017
Income Statement [Abstract]
Revenues		$ 270,268	$ 247,009	$ 836,425	$ 770,642
Restaurant operating costs (excluding depreciation and amortization):
Cost of sales	[1]	68,600	65,553	210,597	200,465
Labor and benefits		99,061	91,228	301,480	277,724
Occupancy and operating	[1]	61,102	55,238	177,678	164,054
General and administrative		14,661	13,035	45,643	41,536
Depreciation and amortization		17,686	17,430	52,760	51,231
Restaurant opening		403	534	1,835	3,205
Loss on disposal and impairment of assets		865	1,070	3,049	4,168
Natural disaster and related			905		905
Severance and legal settlements			423		423
Total costs and expenses		262,378	245,416	793,042	743,711
Income from operations		7,890	1,593	43,383	26,931
Other (expense) income:
Interest expense, net		(1,058)	(1,177)	(3,826)	(3,178)
Other income (expense), net		239	423	220	1,474
Total other expense		(819)	(754)	(3,606)	(1,704)
Income before income taxes		7,071	839	39,777	25,227
Income tax (benefit) expense		(1,445)	(1,550)	(348)	3,933
Net income		$ 8,516	$ 2,389	$ 40,125	$ 21,294
Net income per share:
Basic		$ 0.40	$ 0.11	$ 1.92	$ 0.98
Diluted		$ 0.39	$ 0.11	$ 1.87	$ 0.97
Weighted average number of shares outstanding:
Basic		21,118	21,354	20,861	21,620
Diluted		21,807	21,670	21,500	22,032
Cash dividends declared per common share		$ 0.11		$ 0.33

[1] Related party costs included in cost of sales are $21,047 and $20,487 for the thirteen weeks ended October 2, 2018 and October 3, 2017, respectively, and $64,628 and $62,376 for the thirty-nine weeks ended October 2, 2018 and October 3, 2017, respectively. Related party costs included in occupancy and operating are $2,393 and $2,325 for the thirteen weeks ended October 2, 2018 and October 3, 2017, respectively, and $7,328 and $6,868 for the thirty-nine weeks ended October 2, 2018 and October 3, 2017, respectively. See Note 5 for further information.