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FAIR VALUE MEASUREMENTS - Fair Value Measurements on a Recurring Basis (Details) - Fair Value, Recurring - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgages and notes receivable $ 43,796 $ 30,994 $ 17,535
Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments - interest rate swaps 12,064 15,905  
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgages and notes receivable 0 0  
Level 1 | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments - interest rate swaps 0 0  
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgages and notes receivable 0 0  
Level 2 | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments - interest rate swaps 0 0  
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgages and notes receivable 43,796 30,994  
Level 3 | Interest Rate Swap      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative instruments - interest rate swaps $ 12,064 $ 15,905