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FAIR VALUE MEASUREMENTS - Changes in Fair Value of Receivables (Details) - Fair Value, Recurring - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgages and notes receivable $ 43,796 $ 17,535 $ 30,994
Change in fair value of receivables 997 863  
Other Gains (Losses)      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Change in fair value of receivables 7 5  
Interest Income      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Change in fair value of receivables $ 990 $ 858