Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of gain (loss) recognized in income from asset and liability measured at fair value on recurring basis using unobservable input (level 3).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of investment in marketable security.

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-SubTopic 210
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Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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The cash outflow associated with the purchase of noncontrolling interest during the period.

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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Variable Interest Entities and Marketable Securities (Details) - USD ($)	9 Months Ended		20 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Payments for acquisition of noncontrolling interests – consolidated real estate entities	$ 12,200,000
Marketable securities	0
Cost basis of marketable securities			$ 6,900,000
Gross unrealized gain			113,000
Realized (gain) loss on marketable securities	$ 3,378,000	$ 0
Fair Value, Recurring \| Fair Value, Inputs, Level 1
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Carrying value			$ 7,100,000
71 France \| Investors Real Estate Trust
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Ownership acquired	47.40%