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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
Nov. 30, 2020
Mar. 04, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Variable Interest Entities - Ground Lease                          
Revenue     $ 18,732,000 $ 21,071,000 $ 20,861,000 $ 21,239,000 $ 22,448,000 $ 20,414,000 $ 20,719,000 $ 21,155,000 $ 81,903,000 $ 84,736,000 $ 79,126,000
Variable Interest Entity, Not Primary Beneficiary                          
Variable Interest Entities - Ground Lease                          
Revenue                     729,000 1,597,000 3,357,000
Variable Interest Entity, Not Primary Beneficiary | Properties Located in Wheaton and Lakemoor, Illinois | Ground lease rental income                          
Variable Interest Entities - Ground Lease                          
Revenue                       $ 814,000 $ 1,964,000
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    
Maximum Exposure to Loss     13,901,000               13,901,000    
Deposit received From owner/operator to cover past operating expenses and future cash flow shortfalls $ 1,200,000                        
Amount of near-term capital expenditures required at the property $ 170,300                        
Percentage of operating expense shortfalls covered by the Company 78.00%                        
Amount of operating expense shortfalls covered by the Company   $ 409,000                      
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio | Land                          
Variable Interest Entities - Ground Lease                          
Current Balance of Owner or Operator Mortgage Debt Obtained From Third Party     $ 67,162,000               $ 67,162,000