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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 |  |  |

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