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FAIR VALUE MEASUREMENTS - Fair Value Measurements on a Recurring Basis (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Risk Level, Low    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk 0.00038%  
Risk Level, High    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk 0.0005%  
Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk 0.005%  
Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Concentration risk 0.01%  
Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages and notes receivable $ 30,994  
Derivative instruments - interest rate swaps   $ 7,607
Fair Value, Recurring | Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments - interest rate swaps 15,905  
Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages and notes receivable 0  
Derivative instruments - interest rate swaps 0 0
Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages and notes receivable 0  
Derivative instruments - interest rate swaps   0
Fair Value, Recurring | Level 2 | Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative instruments - interest rate swaps 0  
Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgages and notes receivable 30,994  
Derivative instruments - interest rate swaps $ 15,905 $ 7,607