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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Ground Leases (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($) item	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) property item	Dec. 31, 2017 USD ($) property	Dec. 31, 2016 USD ($)
Variable Interest Entities
Revenues	$ 20,270,000	$ 19,570,000	$ 19,752,000	$ 19,534,000	$ 19,894,000	$ 19,137,000	$ 18,413,000	$ 18,472,000	$ 79,126,000	$ 75,916,000	$ 70,588,000
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Restricted cash	$ 1,106,000				443,000				1,106,000	443,000
Rental income, net
Variable Interest Entities
Revenues									$ 70,298,000	$ 68,244,000	64,164,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities
Number of affiliated owner/operators | item	2								2
Variable Interest Entity, Not Primary Beneficiary | The Briarbrook Village Apartments, Wheaton, Illinois and Vue Apartments, Beachwood, Ohio
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Land Contract Purchase Price									$ 24,426,000
Units in Apartment Complex | item									690
Owner/ Operator Mortgage from Third Party									$ 106,855,000
Carrying Amount and Maximum Exposure to Loss	$ 24,437,000								$ 24,437,000
Number of ground lease properties | property									2	2
Restricted cash	1,106,000				$ 443,000				$ 1,106,000	$ 443,000
Variable Interest Entity, Not Primary Beneficiary | The Briarbrook Village Apartments, Wheaton, Illinois
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Land Contract Purchase Price									$ 10,530,000
Units in Apartment Complex | item									342
Owner/ Operator Mortgage from Third Party									$ 39,411,000
Restricted cash	356,000								356,000
Variable Interest Entity, Not Primary Beneficiary | The Briarbrook Village Apartments, Wheaton, Illinois | Land
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Carrying Amount and Maximum Exposure to Loss	10,536,000								10,536,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Land Contract Purchase Price									$ 13,896,000
Units in Apartment Complex | item									348
Owner/ Operator Mortgage from Third Party									$ 67,444,000
Security Deposit	750,000								750,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio | Land
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Carrying Amount and Maximum Exposure to Loss	$ 13,901,000								13,901,000
Variable Interest Entity, Not Primary Beneficiary | Rental income, net
Variable Interest Entities
Revenues									3,357,000	3,702,000	2,361,000
Variable Interest Entity, Not Primary Beneficiary | Rental income, net | Properties Located in Lakemoor, Illinois and Sandy Springs, Georgia
Variable Interest Entities
Revenues									$ 800,000	$ 1,125,000	$ 1,399,000

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