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NON-CONTROLLING INTERESTS - Narrative (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 21, 2020 | Sep. 23, 2020 | Sep. 25, 2019 | Sep. 23, 2020 | Sep. 25, 2019
Noncontrolling Interest [Line Items] |  |  |  |  |
Non-controlling interest holders' weighted average ownership percentage |  | 7.50% | 14.40% | 7.90% | 17.90%
ATM Program | Class A Common Stock |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Sale of stock, maximum offering price | $ 75,000,000 |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | 233,467 |  |  |  |
Proceeds from sale of stock | $ 9,794,000 |  |  |  |
Over-Allotment Option | Class A Common Stock |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | 3,416,070 |  |  |  |
Proceeds from sale of stock | $ 135,857,000 |  |  |  |
Employee Stock Option |  |  |  |  |
Noncontrolling Interest [Line Items] |  |  |  |  |
Units acquired during the period (in shares) |  | 38,564 | 172,403 | 180,068 | 383,117

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