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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - Ground Leases (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) item | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) property item | Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($)
Variable Interest Entities |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 20,270,000 | $ 19,570,000 | $ 19,752,000 | $ 19,534,000 | $ 19,894,000 | $ 19,137,000 | $ 18,413,000 | $ 18,472,000 | $ 79,126,000 | $ 75,916,000 | $ 70,588,000
VIE ground leases and aggregate carrying amount and maximum exposure to loss |  |  |  |  |  |  |  |  |  |  |
Restricted cash | $ 1,106,000 |  |  |  | 443,000 |  |  |  | 1,106,000 | 443,000 |
Rental income, net |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 70,298,000 | $ 68,244,000 | 64,164,000
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities |  |  |  |  |  |  |  |  |  |  |
Number of affiliated owner/operators | item | 2 |  |  |  |  |  |  |  | 2 |  |
Variable Interest Entity, Not Primary Beneficiary | The Briarbrook Village Apartments, Wheaton, Illinois and Vue Apartments, Beachwood, Ohio |  |  |  |  |  |  |  |  |  |  |
VIE ground leases and aggregate carrying amount and maximum exposure to loss |  |  |  |  |  |  |  |  |  |  |
Land Contract Purchase Price |  |  |  |  |  |  |  |  | $ 24,426,000 |  |
Units in Apartment Complex | item |  |  |  |  |  |  |  |  | 690 |  |
Owner/ Operator Mortgage from Third Party |  |  |  |  |  |  |  |  | $ 106,855,000 |  |
Carrying Amount and Maximum Exposure to Loss | $ 24,437,000 |  |  |  |  |  |  |  | $ 24,437,000 |  |
Number of ground lease properties | property |  |  |  |  |  |  |  |  | 2 | 2 |
Restricted cash | 1,106,000 |  |  |  | $ 443,000 |  |  |  | $ 1,106,000 | $ 443,000 |
Variable Interest Entity, Not Primary Beneficiary | The Briarbrook Village Apartments, Wheaton, Illinois |  |  |  |  |  |  |  |  |  |  |
VIE ground leases and aggregate carrying amount and maximum exposure to loss |  |  |  |  |  |  |  |  |  |  |
Land Contract Purchase Price |  |  |  |  |  |  |  |  | $ 10,530,000 |  |
Units in Apartment Complex | item |  |  |  |  |  |  |  |  | 342 |  |
Owner/ Operator Mortgage from Third Party |  |  |  |  |  |  |  |  | $ 39,411,000 |  |
Restricted cash | 356,000 |  |  |  |  |  |  |  | 356,000 |  |
Variable Interest Entity, Not Primary Beneficiary | The Briarbrook Village Apartments, Wheaton, Illinois | Land |  |  |  |  |  |  |  |  |  |  |
VIE ground leases and aggregate carrying amount and maximum exposure to loss |  |  |  |  |  |  |  |  |  |  |
Carrying Amount and Maximum Exposure to Loss | 10,536,000 |  |  |  |  |  |  |  | 10,536,000 |  |
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio |  |  |  |  |  |  |  |  |  |  |
VIE ground leases and aggregate carrying amount and maximum exposure to loss |  |  |  |  |  |  |  |  |  |  |
Land Contract Purchase Price |  |  |  |  |  |  |  |  | $ 13,896,000 |  |
Units in Apartment Complex | item |  |  |  |  |  |  |  |  | 348 |  |
Owner/ Operator Mortgage from Third Party |  |  |  |  |  |  |  |  | $ 67,444,000 |  |
Security Deposit | 750,000 |  |  |  |  |  |  |  | 750,000 |  |
Variable Interest Entity, Not Primary Beneficiary | The Vue Apartments, Beachwood, Ohio | Land |  |  |  |  |  |  |  |  |  |  |
VIE ground leases and aggregate carrying amount and maximum exposure to loss |  |  |  |  |  |  |  |  |  |  |
Carrying Amount and Maximum Exposure to Loss | $ 13,901,000 |  |  |  |  |  |  |  | 13,901,000 |  |
Variable Interest Entity, Not Primary Beneficiary | Rental income, net |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,357,000 | 3,702,000 | 2,361,000
Variable Interest Entity, Not Primary Beneficiary | Rental income, net | Properties Located in Lakemoor, Illinois and Sandy Springs, Georgia |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entities |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 800,000 | $ 1,125,000 | $ 1,399,000

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