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Variable Interest Entities, Contingent Liability and Consolidated Joint Ventures - Ground Leases (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Variable Interest Entities
Rental income, net	$ 21,071,000	$ 20,414,000	$ 63,171,000	$ 62,288,000
Variable Interest Entity, Not Primary Beneficiary | Ground lease rental income
Variable Interest Entities
Rental income, net	243,000	383,000	729,000	1,354,000
Variable Interest Entity, Not Primary Beneficiary | Property located in, Wheaton, Illinois | Ground lease rental income
Variable Interest Entities
Rental income, net		$ 203,000		$ 814,000
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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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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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