ACQUISITIONS, DISPOSITIONS AND IMPAIRMENT CHARGES - Property Acquisitions Narrative (Details) - Primary beneficiary - Multi-family residential - Joint ventures - Purchase of properties $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)
Acquisitions
Purchase Price	$ 109,465
San Marcos, TX
Acquisitions
Ownership Percentage	20.00%
Purchase Price	$ 1,608

Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121559654&loc=SL6759159-111685

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration