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FAIR VALUE MEASUREMENTS - Changes in Fair Value of Receivables (Details) - Fair Value, Recurring - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Mortgages and notes receivable | $ 48,364 | $ 24,315 | $ 30,994
Change in fair value of receivables | 1,770 | 263 |
Other Gains (Losses) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Change in fair value of receivables | 11 | 3 |
Interest Income |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Change in fair value of receivables | $ 1,759 | $ 260 |

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