Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Cash flows from operating activities:
Net income (loss)	$ 24,474	$ 24,900	$ (8,994)
Adjustments to reconcile net income (loss) to net cash flows provided by operating activities:
Depreciation and amortization	16,878	17,855	17,825
Bad debt expense	190	0	0
Stock-based compensation expense	3,093	2,474	2,005
Income tax receivable agreement expense (income)	139	57	(761)
Loss on disposition of restaurants	0	5,058	0
Loss on disposal of assets	189	266	278
Impairment of property and equipment	3,498	3,559	5,147
Closed-store reserve expense	0	0	4,503
Amortization of deferred financing costs	252	251	280
Amortization of favorable and unfavorable leases, net	0	0	(47)
Deferred income taxes, net	4,008	9,578	(3,428)
Changes in operating assets and liabilities:
Accounts and other receivables	(1,155)	1,094	(2,387)
Inventories	(92)	338	(190)
Prepaid expenses and other current assets	1,853	(2,727)	(319)
Income taxes receivable/payable	(2,145)	(448)	37
Other assets	(13)	(412)	122
Accounts payable	666	(3,192)	482
Accrued salaries and vacation	1,548	1,044	235
Accrued insurance	976	2,364	1,225
Payment related to tax receivable agreement	(5,237)	(5,764)	(7,272)
Other accrued expenses and liabilities	(8,575)	(20,160)	36,701
Net cash flows provided by operating activities	40,547	36,135	45,442
Cash flows from investing activities:
Proceeds from disposition of restaurants	0	4,770	0
Purchase of property and equipment	(6,690)	(15,439)	(27,802)
Net cash flows used in investing activities	(6,690)	(10,669)	(27,802)
Cash flows from financing activities:
Proceeds from borrowings on revolver and swingline loans	59,500	42,000	13,307
Payments on revolver and swingline loan	(93,700)	(19,000)	(33,000)
Minimum tax withholdings related to net share settlements	(335)	(365)	(114)
Proceeds from issuance of common stock upon exercise of stock options, net of expenses	5,866	1,450	1,837
Payment of obligations under finance leases	(39)	(68)	(132)
Deferred financing costs for revolver loan	0	0	(138)
Repurchases of common stock	0	(48,382)	(981)
Net cash flows used in financing activities	(28,708)	(24,365)	(19,221)
Increase (decrease) in cash and cash equivalents	5,149	1,101	(1,581)
Cash and cash equivalents, beginning of period	8,070	6,969	8,550
Cash and cash equivalents, end of period	13,219	8,070	6,969
Supplemental cash flow information
Cash paid during the period for interest	2,956	3,649	3,393
Cash paid during the period for income taxes	4,225	558	183
Unpaid purchases of property and equipment	1,925	746	1,543
Borrowing on revolver for financing fees	$ 0	$ 0	$ 693