CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 24, 2020	Jun. 26, 2019
OPERATING ACTIVITIES
Net income (loss) (including amounts attributable to non-controlling interests)	$ (19,110)	$ 14,778
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation expense	23,857	18,765
Capitalized Computer Software, Amortization	628	0
Non-cash operating lease cost	22,220	18,765
Equity-based compensation	2,719	3,872
Deferred income taxes	11,225	317
Non-cash interest expense	16	0
Gain on sale of marketable securities	(79)	(22)
Impairment and loss on disposal of assets	2,522	728
Unrealized (gain) loss on available-for-sale securities	22	(231)
Other non-cash expense	897	2
Changes in operating assets and liabilities:
Accounts receivable	1,679	7,252
Inventories	(125)	57
Prepaid expenses and other current assets	(745)	(3,908)
Other assets	(1,542)	(5,354)
Accounts payable	5,802	(5,202)
Accrued expenses	(15,179)	3,870
Accrued wages and related liabilities	(3,802)	(1,271)
Other current liabilities	(782)	862
Long-term operating lease liabilities	(12,649)	(17,408)
Other long-term liabilities	419	19
NET CASH PROVIDED BY OPERATING ACTIVITIES	17,993	35,891
INVESTING ACTIVITIES
Purchases of property and equipment	(37,637)	(55,998)
Purchases of marketable securities	(268)	(715)
Sales of marketable securities	20,000	27,000
NET CASH USED IN INVESTING ACTIVITIES	(17,905)	(29,713)
FINANCING ACTIVITIES
Proceeds from revolving credit facility	50,000	0
Payments on revolving credit facility	(50,000)	0
Deferred financing costs	(64)	0
Proceeds from issuance of Class A common stock sold in equity offerings, net of underwriting discounts, commissions and offering costs	144,997	0
Payments on principal of finance leases	(1,150)	(912)
Distributions paid to non-controlling interest holders	(314)	(1,667)
Payments under tax receivable agreement	(6,643)	(707)
Proceeds from stock option exercises	1,740	3,427
Payment, Tax Withholding, Share-based Payment Arrangement	(1,769)	(1,336)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	136,797	(1,195)
NET INCREASE IN CASH AND CASH EQUIVALENTS	136,885	4,983
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	37,099	24,750
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 173,984	$ 29,733