Condensed Consolidated Statement of Cash Flows Statement - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2018	Jun. 28, 2017
Statement of Cash Flows [Abstract]
Net income	$ 7,581	$ 12,696
Depreciation and amortization	8,556	8,949
Stock-based compensation expense	1,170	414
Income tax receivable agreement expense (income)	(206)	126
Loss on disposal of assets	(53)	(659)
Impairment of property and equipment	1,708	445
Closed-store reserve expense	5,074	810
Amortization of deferred financing costs	152	152
Amortization of favorable and unfavorable leases, net	(27)	(57)
Deferred income taxes, net	1,349	7,562
Increase (Decrease) in Accounts and Other Receivables	400	1,398
Increase (Decrease) in Inventories	(212)	18
Increase (Decrease) in Prepaid Expense and Other Assets	553	624
Increase (Decrease) in Other Operating Assets	(117)	(37)
Increase (Decrease) in Accounts Payable	(1,051)	(1,187)
Increase (Decrease) in Employee Related Liabilities	(687)	2,110
Increase (Decrease) in Insurance Liabilities	446	271
Increase (Decrease) in Income Taxes	55	14
Increase (Decrease) in Other Accrued Liabilities	2,081	(353)
Increase (Decrease) in Restricted Cash	0	(125)
Net cash flows provided by operating activities	25,630	30,733
Purchase of property and equipment	13,952	19,040
Net cash flows used in investing activities	(13,952)	(19,040)
Payments Related to Tax Withholding for Share-based Compensation	(79)	0
Payments on revolver loan	13,000	9,500
Proceeds from Long-term Lines of Credit	6,000	0
Proceeds from Issuance of Common Stock	0	93
Payment of obligations under capital leases	64	83
Net cash flows used in financing activities	(7,143)	(9,490)
Increase in cash and cash equivalents	4,535	2,203
Cash and cash equivalents	13,085	4,371
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	1,593	1,650
Income Taxes Paid	125	135
Capital Expenditures Incurred but Not yet Paid	$ 2,295	$ 4,321