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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITY AND CONSOLIDATED JOINT VENTURES - Ground Leases (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 02, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2016
Variable Interest Entities - Ground Lease
Revenue		$ 20,422,000	$ 20,861,000	$ 41,238,000	$ 42,100,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio
Variable Interest Entities - Ground Lease
Maximum Exposure to Loss		15,108,000		15,108,000
Owner/ Operator Mortgage from Third Party						$ 67,444,000
Current Balance of Owner or Operator Mortgage Debt Obtained From Third Party		66,590,000		$ 66,590,000
Percentage of operating expense shortfalls covered by the Company				78.00%
Amount of operating expense shortfalls covered by the Company	$ 11,000	702,000		$ 1,132,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio | Ground lease rental income
Variable Interest Entities - Ground Lease
Revenue		$ 0	$ 243,000	$ 0	$ 486,000

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