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FAIR VALUE MEASUREMENTS - Changes in Fair Value of Receivables (Details) - Fair Value, Recurring
$ in Thousands
6 Months Ended
Jun. 30, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Mortgage and note receivable $ 17,535
Change in fair value of receivables 863
Other Gains (Losses)  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Change in fair value of receivables 5
Interest Income  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Change in fair value of receivables $ 858