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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Ground Leases (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Variable Interest Entities |  |  |
Number of VIEs | item | 3 |  |
Restricted cash | $ 643,000 | $ 1,074,000 |
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 |  |
Maximum Exposure to Loss | 34,029,000 |  |
Land - The Meadows Apartments, Lakemoor, Illinois |  |  |
Variable Interest Entities |  |  |
Contract purchase price (real estate) | $ 9,300,000 | 9,300,000 |
Improved by Units in Apartment Complex | item | 496 |  |
Owner/Operator mortgage from third party | $ 43,824,000 |  |
Land - The Meadows Apartments, Lakemoor, Illinois | Land. |  |  |
Variable Interest Entities |  |  |
Maximum Exposure to Loss | 9,592,000 |  |
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 |  |
Land - The Briarbrook Village Apartments Wheaton, Illinois | Land. |  |  |
Variable Interest Entities |  |  |
Maximum Exposure to Loss | 10,536,000 |  |
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 |  |
Land - The Vue Apartments, Beachwood, Ohio | Land. |  |  |
Variable Interest Entities |  |  |
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 | 2,361,000 | 1,280,000 | $ 531,000
Land - River Crossing Apartments, Sandy Springs, Georgia |  |  |
Variable Interest Entities |  |  |
Revenue from the ground lease | $ 308,000 | 419,000 | $ 531,000
Restricted cash |  | $ 1,074,000 |

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- Definition The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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