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Variable Interest Entities, Contingent Liability and Consolidated Joint Ventures - Ground Leases (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Variable Interest Entities
Rental income, net	$ 20,861,000	$ 20,719,000	$ 42,100,000	$ 41,874,000
Variable Interest Entity, Not Primary Beneficiary | Ground lease rental income
Variable Interest Entities
Rental income, net	243,000	486,000	486,000	971,000
Variable Interest Entity, Not Primary Beneficiary | Property located in, Wheaton, Illinois | Ground lease rental income
Variable Interest Entities
Rental income, net		$ 306,000		$ 611,000
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		$ 13,901,000

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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