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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - Ground Leases (Details) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) item | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) item | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Variable Interest Entities |  |  |  |  |  |
Number of VIEs through ground leases | item |  | 3 |  | 3 |  |
Owner/operator supplemental mortgage | $ 7,556,000 |  |  |  |  |
Owner/operator original mortgage | 43,824,000 |  |  |  |  |
Fixed rent payment due to second mortgage | $ 5,906,000 |  |  |  |  |
Cash Reserves - ground lease |  | $ 416,000 |  | $ 416,000 |  | $ 443,000
Accrued expenses and other liabilities |  |  |  |  |  |
Variable Interest Entities |  |  |  |  |  |
Fixed rent payment balance |  | 5,762,000 |  | 5,762,000 |  | $ 5,870,000
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 |  |  |  | $ 158,186,000 |  |
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 |  |  |  | $ 51,331,000 |  |
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 Apartment Lakemoor, Illinois; Briarbrook Village Apartment, Wheaton, Illinois; and Vue Apartment, Beachwood, Ohio |  |  |  |  |  |
Variable Interest Entities |  |  |  |  |  |
Revenue from the ground lease |  | $ 941,000 | $ 917,000 | $ 1,947,000 | $ 1,804,000 |

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