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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 25, 2020
Cash paid for:
Income taxes, net of refunds	$ 388	$ 801
Interest, net of amounts capitalized	70	61
Non-cash investing activities:
Accrued purchases of property and equipment	12,949	13,715
Capitalized equity-based compensation	9	13
Non-cash financing activities:
Revolving Credit Facility amendment-related accrual	112	0
Convertible Notes issuance-related accrual	312	0
Establishment of liabilities under tax receivable agreement	$ 1,094	$ 310

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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