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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - Ground Leases (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) item | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) item | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Variable Interest Entities |  |  |  |  |
Number of VIEs | item | 3 |  | 3 |  |
Restricted cash - ground lease | $ 530,000 |  | $ 530,000 |  | $ 643,000
The Meadows Apartments, Lakemoor, Illinois; Briarbrook Village Apartments, Wheaton, Illinois and Vue Apartments, Beachwood, Ohio |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Land Contract Purchase Price |  |  | $ 33,726,000 |  |
Units in Apartment Complex | item |  |  | 1,186 |  |
Owner/ Operator Mortgage from Third Party |  |  | $ 150,679,000 |  |
Carrying Amount and Maximum Exposure to Loss | 34,029,000 |  | 34,029,000 |  |
The Meadows Apartments, Lakemoor, Illinois |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Land Contract Purchase Price |  |  | $ 9,300,000 |  |
Units in Apartment Complex | item |  |  | 496 |  |
Owner/ Operator Mortgage from Third Party |  |  | $ 43,824,000 |  |
The Meadows Apartments, Lakemoor, Illinois | Land |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Carrying Amount and Maximum Exposure to Loss | 9,592,000 |  | 9,592,000 |  |
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 Meadows Apartments, Lakemoor, Illinois; Briarbrook Village Apartments, Wheaton, Illinois; Vue Apartments, Beachwood, Ohio and River Crossing Apartments, Sandy Springs, Georgia |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Revenue from the ground lease | $ 954,000 | $ 663,000 | $ 2,758,000 | $ 1,525,000 |
River Crossing Apartments, Sandy Springs, Georgia |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Revenue from the ground lease |  | $ 0 |  | $ 308,000 |

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- Definition Represents the amount of mortgage balance related to third parties. + References No definition available. + Details
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