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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - Ground Leases (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Variable Interest Entities |  |  |  |  |
Number of VIEs through ground leases | item | 2 |  | 2 |  |
Cash Reserves - ground lease | $ 379,000 |  | $ 379,000 |  | $ 443,000
Land, Lakemoor, Illinois |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Revenue from the ground lease | 214,000 | $ 282,000 | 800,000 | $ 862,000 |
The Briarbrook Village Apartments, Wheaton, Illinois and Vue Apartments, Beachwood, Ohio |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Land Contract Purchase Price |  |  | $ 24,426,000 |  |
Units in Apartment Complex | item |  |  | 690 |  |
Owner/ Operator Mortgage from Third Party |  |  | $ 106,855,000 |  |
Carrying Amount and Maximum Exposure to Loss | 24,437,000 |  | 24,437,000 |  |
The Briarbrook Village Apartments Wheaton, Illinois |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Land Contract Purchase Price |  |  | $ 10,530,000 |  |
Units in Apartment Complex | item |  |  | 342 |  |
Owner/ Operator Mortgage from Third Party |  |  | $ 39,411,000 |  |
The Briarbrook Village Apartments Wheaton, Illinois | Land |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Carrying Amount and Maximum Exposure to Loss | 10,536,000 |  | 10,536,000 |  |
The Vue Apartments, Beachwood, Ohio |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Land Contract Purchase Price |  |  | $ 13,896,000 |  |
Units in Apartment Complex | item |  |  | 348 |  |
Owner/ Operator Mortgage from Third Party |  |  | $ 67,444,000 |  |
The Vue Apartments, Beachwood, Ohio | Land |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Carrying Amount and Maximum Exposure to Loss | 13,901,000 |  | 13,901,000 |  |
The Briarbrook Village Apartment, Wheaton, Illinois; and Vue Apartment, Beachwood, Ohio |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Revenue from the ground lease | $ 925,000 | $ 954,000 | $ 2,872,000 | $ 2,758,000 |

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