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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Variable Interest Entities and Marketable Securities (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Payments for acquisition of noncontrolling interests – consolidated real estate entities |  | $ 12,200,000 |
Marketable securities | $ 0 |  | $ 0
Realized (gain) loss on marketable securities | $ 0 | $ 1,227,000 |
71 France | Investors Real Estate Trust |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Ownership acquired |  | 47.40% |

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