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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - Ground Leases (Details)	1 Months Ended		3 Months Ended		6 Months Ended
	Mar. 31, 2015 USD ($) item	Jun. 30, 2014 USD ($) item	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Variable Interest Entities
Carrying value of mortgage loans			$ 351,849,000		$ 351,849,000		$ 331,055,000
Restricted cash							1,074,000
Land - The Meadows Apartments, Lakemoor, Illinois
Variable Interest Entities
Contract purchase price (real estate)	$ 9,300,000
Number of apartment units in the complex purchased | item	496
Carrying value of mortgage loans			43,824,000		43,824,000
Maximum Exposure to Loss			9,606,000		9,606,000
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			14,000		14,000
Land - River Crossing Apartments, Sandy Springs, Georgia
Variable Interest Entities
Contract purchase price (real estate)		$ 6,510,000
Number of apartment units in the complex purchased | item		196
Carrying value of mortgage loans			16,230,000		16,230,000
Restricted cash							$ 1,074,000
The Meadows Apartments, Lakemoor, Illinois and River Crossing Apartments, Sandy Springs, Georgia
Variable Interest Entities
Revenue from the ground lease			$ 434,000	$ 460,000	$ 862,000	$ 711,000

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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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