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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - Ground Leases (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) item	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Variable Interest Entities
Restricted cash	$ 836,000		$ 836,000		$ 1,074,000
Maximum Exposure to Loss	34,080,000		34,080,000
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		$ 150,679,000
Land - The Meadows Apartments, Lakemoor, Illinois
Variable Interest Entities
Contract purchase price (real estate)			$ 9,300,000
Improved by Units in Apartment Complex | item			496
Owner/Operator mortgage from third party	43,824,000		$ 43,824,000
Land - The Meadows Apartments, Lakemoor, Illinois | Land.
Variable Interest Entities
Maximum Exposure to Loss	9,592,000		9,592,000
Land - The Meadows Apartments, Lakemoor, Illinois | Unbilled Rent Receivable
Variable Interest Entities
Maximum Exposure to Loss	15,000		15,000
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		$ 39,411,000
Restricted cash	836,000		836,000
Land - The Briarbrook Village Apartments, Wheaton, Illinois | Land.
Variable Interest Entities
Maximum Exposure to Loss	10,536,000		10,536,000
Land - The Briarbrook Village Apartments, Wheaton, Illinois | Unbilled Rent Receivable
Variable Interest Entities
Maximum Exposure to Loss	19,000		19,000
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		$ 67,444,000
Land - The Vue Apartments, Beachwood, Ohio | Land.
Variable Interest Entities
Maximum Exposure to Loss	13,901,000		13,901,000
Land - The Vue Apartments, Beachwood, Ohio | Unbilled Rent Receivable
Variable Interest Entities
Maximum Exposure to Loss	17,000		17,000
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	663,000	$ 454,000	1,525,000	$ 1,166,000
Land - River Crossing Apartments, Sandy Springs, Georgia
Variable Interest Entities
Restricted cash					$ 1,074,000
Revenue from the ground lease	$ 0	$ 232,000	$ 308,000	$ 697,000

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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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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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