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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Variable Interest Entities and Marketable Securities (Details) - USD ($) | 6 Months Ended | 20 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Marketable securities | $ 0 |  |
Payments for acquisition of noncontrolling interests – consolidated real estate entities | 12,200,000 |  |
Realized (gain) loss on marketable securities | $ 3,378,000 | $ 0 |
Cost basis of marketable securities |  |  | $ 6,900,000
Gross unrealized gain |  |  | 113,000
71 France | Investors Real Estate Trust |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Ownership acquired | 47.40% |  |
Fair Value, Recurring | Fair Value, Inputs, Level 1 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Carrying value |  |  | $ 7,100,000

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