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EQUITY-BASED COMPENSATION - Schedule of compensation expense recognized (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 25, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity-based compensation expense | $ 1,681 | $ 1,300
Total income tax benefit recognized related to equity-based compensation | 67 | 36
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity-based compensation expense | 20 | 261
Performance stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity-based compensation expense | 414 | 413
Restricted stock units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity-based compensation expense | 1,247 | 626
General and Administrative Expense [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity-based compensation expense | 1,541 | 1,214
Labor And Related Expenses [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity-based compensation expense | $ 140 | $ 86

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