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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 23, 2020 | Sep. 25, 2019
Cash paid for: |  |
Income taxes, net of refunds | $ 1,270 | $ 2,483
Interest, net of amounts capitalized | 584 | 157
Non-cash investing activities: |  |
Accrued purchases of property and equipment | 9,544 | 17,394
Capitalized equity-based compensation | 29 | 79
Non-cash financing activities: |  |
Establishment of liabilities under tax receivable agreement | 414 | 20,027
Redemption or Exchange of Units | Class A Common Stock |  |
Non-cash financing activities: |  |
Class A common stock issued in connection with the redemption of LLC Interests | 0 | 1
Redemption or Exchange of Units | Class B Common Stock |  |
Non-cash financing activities: |  |
Cancellation of Class B common stock in connection with the redemption of LLC Interests | $ 0 | $ (1)

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