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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITY AND CONSOLIDATED JOINT VENTURES - Ground Leases (Details) - USD ($)	1 Months Ended		2 Months Ended	3 Months Ended								12 Months Ended
	Jan. 31, 2023	Nov. 30, 2020	Mar. 06, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2016
Variable Interest Entities - Ground Lease
Revenue				$ 27,715,000	$ 21,473,000	$ 21,472,000	$ 21,556,000	$ 21,066,000	$ 20,436,000	$ 20,422,000	$ 20,816,000	$ 92,216,000	$ 82,740,000	$ 81,903,000
Proceeds received from settlement of lawsuit	$ 4,626,000
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities - Ground Lease
Maximum Exposure to Loss				16,514,000								16,514,000
Variable Interest Entity, Not Primary Beneficiary | Ground lease rental income
Variable Interest Entities - Ground Lease
Revenue												0	0	$ 729,000
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio
Variable Interest Entities - Ground Lease
Owner/ Operator Mortgage from Third Party															$ 67,444,000
Current Balance of Owner or Operator Mortgage Debt Obtained From Third Party				$ 64,816,000								64,816,000
Percentage of operating expense shortfalls & cap-ex covered by the Company		78.00%
Amount of operating expense shortfalls & cap-ex covered by the Company			$ 447,000									$ 697,000	$ 1,746,000

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- Definition

The amount of operating expense shortfalls and capital expenditures in excess of the initial operating expense deposit to be covered by the Company.

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The percentage of operating expense shortfalls and capital expenditures in excess of the initial operating expense deposit to be covered by the Company.

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Current balance of owner/operator mortgage debt obtained from a third party.

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Amount awarded from other party in judgment or settlement of litigation.

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Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
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-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981

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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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