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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
Nov. 30, 2020
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2016
Variable Interest Entities - Ground Lease                    
Revenue     $ 21,066,000 $ 20,436,000 $ 20,422,000 $ 20,816,000 $ 82,740,000 $ 81,903,000 $ 84,736,000  
Variable Interest Entity, Not Primary Beneficiary                    
Variable Interest Entities - Ground Lease                    
Maximum Exposure to Loss     15,756,000       15,756,000      
Variable Interest Entity, Not Primary Beneficiary | Ground lease rental income                    
Variable Interest Entities - Ground Lease                    
Revenue             0 $ 729,000 1,597,000  
Variable Interest Entity, Not Primary Beneficiary | Property located in, Wheaton, Illinois | Ground lease rental income                    
Variable Interest Entities - Ground Lease                    
Revenue                 $ 814,000  
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     $ 66,013,000       66,013,000      
Percentage of operating expense shortfalls & cap-ex covered by the Company 78.00%                  
Amount of operating expense shortfalls & cap-ex covered by the Company   $ 271,000         $ 1,746,000