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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Ground Leases (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Variable Interest Entities |  |  |  |
Number of VIEs through ground leases | item |  | 3 |  |
Owner/operator closed supplemental mortgage | $ 7,556,000 |  |  |
Owner/operator closed original mortgage | 43,824,000 |  |  |
Fixed rent payment resulting from second mortgage | $ 5,906,000 |  |  |
Cash Reserves - ground lease |  | $ 443,000 | $ 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 |  | $ 158,235,000 |  |
Carrying Amount and Maximum Exposure to Loss |  | 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 |  | $ 51,380,000 |  |
The Meadows Apartments, Lakemoor, Illinois | Land |  |  |  |
Variable Interest Entities |  |  |  |
Carrying Amount and Maximum Exposure to Loss |  | 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 |  |
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 |  |
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 |  | $ 3,702,000 | 2,361,000 | $ 1,280,000
River Crossing Apartments, Sandy Springs, Georgia |  |  |  |
Variable Interest Entities |  |  |  |
Revenue from the ground lease |  |  | $ 308,000 | $ 419,000

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