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FAIR VALUE MEASUREMENTS - Changes in Fair Value of Receivable (Details) - Fair Value, Recurring
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Mortgages and notes receivable $ 30,994
Changes in fair value of receivables 1,454
Other Gains (Losses)  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Changes in fair value of receivables 12
Interest Income  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Changes in fair value of receivables $ 1,442