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Variable Interest Entities, Contingent Liability and Consolidated Joint Ventures - Ground Leases (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Variable Interest Entities
Rental income, net	$ 21,239,000	$ 21,155,000
Variable Interest Entity, Not Primary Beneficiary | Ground lease rental income
Variable Interest Entities
Rental income, net	243,000	486,000
Variable Interest Entity, Not Primary Beneficiary | Property located in, Wheaton, Illinois | Ground lease rental income
Variable Interest Entities
Rental income, net		$ 306,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio
VIE ground leases and aggregate carrying amount and maximum exposure to loss
Owner/ Operator Mortgage from Third Party	67,444,000
Carrying Amount and Maximum Exposure to Loss	$ 13,901,000

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