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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 25, 2019
Sep. 23, 2020
Sep. 25, 2019
Dec. 25, 2019
Sep. 30, 2017
Loss Contingencies [Line Items]          
Litigation Settlement, Expense   $ 1,200      
Loss Contingency Accrual   $ 1,180      
Percentage of tax benefits due to equity owners   85.00%      
Establishment of liabilities under tax receivable agreement $ 20,027 $ 414 $ 20,027    
Tax receivable agreement liability   228,197   $ 234,426  
Retail site          
Loss Contingencies [Line Items]          
Letters of credit outstanding   $ 130      
Office building          
Loss Contingencies [Line Items]          
Letters of credit outstanding         $ 603
Renewal term   1 year