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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Ground Leases (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Variable Interest Entities
Number of VIEs | item	3
Restricted cash	$ 643,000	$ 1,074,000
The Meadows Apartments, Lakemoor, Illinois; Briarbrook Village Apartments, Wheaton, Illinois and Vue Apartments, Beachwood, Ohio
Variable Interest Entities
Contract purchase price (real estate)	$ 33,726,000
Improved by Units in Apartment Complex | item	1,186
Owner/Operator mortgage from third party	$ 150,679,000
Maximum Exposure to Loss	34,029,000
Land - The Meadows Apartments, Lakemoor, Illinois
Variable Interest Entities
Contract purchase price (real estate)	$ 9,300,000	9,300,000
Improved by Units in Apartment Complex | item	496
Owner/Operator mortgage from third party	$ 43,824,000
Land - The Meadows Apartments, Lakemoor, Illinois | Land.
Variable Interest Entities
Maximum Exposure to Loss	9,592,000
Land - The Briarbrook Village Apartments Wheaton, Illinois
Variable Interest Entities
Contract purchase price (real estate)	$ 10,530,000
Improved by Units in Apartment Complex | item	342
Owner/Operator mortgage from third party	$ 39,411,000
Land - The Briarbrook Village Apartments Wheaton, Illinois | Land.
Variable Interest Entities
Maximum Exposure to Loss	10,536,000
Land - The Vue Apartments, Beachwood, Ohio
Variable Interest Entities
Contract purchase price (real estate)	$ 13,896,000
Improved by Units in Apartment Complex | item	348
Owner/Operator mortgage from third party	$ 67,444,000
Land - The Vue Apartments, Beachwood, Ohio | Land.
Variable Interest Entities
Maximum Exposure to Loss	13,901,000
The Meadows Apartments, Lakemoor, Illinois; Briarbrook Village Apartments, Wheaton, Illinois; Vue Apartments, Beachwood, Ohio and River Crossing Apartments, Sandy Springs, Georgia
Variable Interest Entities
Revenue from the ground lease	2,361,000	1,280,000	$ 531,000
Land - River Crossing Apartments, Sandy Springs, Georgia
Variable Interest Entities
Revenue from the ground lease	$ 308,000	419,000	$ 531,000
Restricted cash		$ 1,074,000

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The total amount of revenue recognized for the period from operating leases, including minimum lease revenue, contingent revenue, percentage revenue and sublease revenue.

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-Publisher FASB
-Name Accounting Standards Codification
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