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ACCOUNTS RECEIVABLE AND NOTES RECEIVABLE, NET OF ALLOWANCE - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes collateralized $ 1.7 $ 1.5
Minimum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest rate on notes receivable 0.00%  
Maximum    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Interest rate on notes receivable 16.00%