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Variable Interest Entities, Contingent Liabilities and Consolidated Joint Ventures - Ground Leases (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) item | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($)
Variable Interest Entities |  |  |  |  |
Restricted cash | $ 836,000 |  | $ 836,000 |  | $ 1,074,000
Maximum Exposure to Loss | 34,080,000 |  | 34,080,000 |  |
The Meadows Apartments, Lakemoor, Illinois; Briarbrook Village Apartments, Wheaton, Illinois and Vue Apartments, Beachwood, Ohio |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Contract purchase price (real estate) |  |  | $ 33,726,000 |  |
Improved by Units in Apartment Complex | item |  |  | 1,186 |  |
Owner/Operator mortgage from third party | 150,679,000 |  | $ 150,679,000 |  |
Land - The Meadows Apartments, Lakemoor, Illinois |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Contract purchase price (real estate) |  |  | $ 9,300,000 |  |
Improved by Units in Apartment Complex | item |  |  | 496 |  |
Owner/Operator mortgage from third party | 43,824,000 |  | $ 43,824,000 |  |
Land - The Meadows Apartments, Lakemoor, Illinois | Land. |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Maximum Exposure to Loss | 9,592,000 |  | 9,592,000 |  |
Land - The Meadows Apartments, Lakemoor, Illinois | Unbilled Rent Receivable |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Maximum Exposure to Loss | 15,000 |  | 15,000 |  |
Land - The Briarbrook Village Apartments, Wheaton, Illinois |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Contract purchase price (real estate) |  |  | $ 10,530,000 |  |
Improved by Units in Apartment Complex | item |  |  | 342 |  |
Owner/Operator mortgage from third party | 39,411,000 |  | $ 39,411,000 |  |
Restricted cash | 836,000 |  | 836,000 |  |
Land - The Briarbrook Village Apartments, Wheaton, Illinois | Land. |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Maximum Exposure to Loss | 10,536,000 |  | 10,536,000 |  |
Land - The Briarbrook Village Apartments, Wheaton, Illinois | Unbilled Rent Receivable |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Maximum Exposure to Loss | 19,000 |  | 19,000 |  |
Land - The Vue Apartments, Beachwood, Ohio |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Contract purchase price (real estate) |  |  | $ 13,896,000 |  |
Improved by Units in Apartment Complex | item |  |  | 348 |  |
Owner/Operator mortgage from third party | 67,444,000 |  | $ 67,444,000 |  |
Land - The Vue Apartments, Beachwood, Ohio | Land. |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Maximum Exposure to Loss | 13,901,000 |  | 13,901,000 |  |
Land - The Vue Apartments, Beachwood, Ohio | Unbilled Rent Receivable |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Maximum Exposure to Loss | 17,000 |  | 17,000 |  |
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 | 663,000 | $ 454,000 | 1,525,000 | $ 1,166,000 |
Land - River Crossing Apartments, Sandy Springs, Georgia |  |  |  |  |
Variable Interest Entities |  |  |  |  |
Restricted cash |  |  |  |  | $ 1,074,000
Revenue from the ground lease | $ 0 | $ 232,000 | $ 308,000 | $ 697,000 |

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