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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITY AND CONSOLIDATED JOINT VENTURES - Ground Leases (Details) - USD ($)	1 Months Ended		3 Months Ended		12 Months Ended
	May 03, 2021	Nov. 30, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2016
Variable Interest Entities - Ground Lease
Revenue			$ 20,816,000	$ 21,239,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio
Variable Interest Entities - Ground Lease
Maximum Exposure to Loss			14,560,000
Owner/ Operator Mortgage from Third Party					$ 67,444,000
Current Balance of Owner or Operator Mortgage Debt Obtained From Third Party			66,870,000
Percentage of operating expense shortfalls covered by the Company		78.00%
Amount of operating expense shortfalls covered by the Company	$ 611,000		430,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio | Ground lease rental income
Variable Interest Entities - Ground Lease
Revenue			$ 0	$ 243,000

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