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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Variable Interest Entities and Marketable Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 20 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Payments for acquisition of noncontrolling interests – consolidated real estate entities | $ 12,200 |
Cost | 4,264 | $ 6,942
Gross Unrealized Gain (Loss) | $ (2,261) | 113
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 | $ 2,003 | $ 7,055

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