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UNCONSOLIDATED AFFILIATES AND COST METHOD INVESTMENT - Joint Venture Financings (Details) $ in Thousands | 1 Months Ended | 2 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | May 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 31, 2017 USD ($) extension_option | Aug. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 extension_option | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2017 | Feb. 29, 2016
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Financed or Extended |  |  |  |  |  |  | $ 102,446 |  | $ 0 | $ 1,802 | $ 0 |  |
Number of extensions | extension_option |  |  |  |  |  |  |  | 2 |  |  |  |  |
Length of extensions |  |  |  |  |  |  |  | 1 year |  |  |  |  |
Ambassador Infrastructure, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  |  | 65.00% |  |  |  |
Amount of loan guaranteed by the company (as a percent) |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |
LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  |  | 2.00% | 2.00% |  |  |  |  |
CoolSprings Galleria |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  | 4.839% |  |  |  |  |  |  |  |  |  |
Amount Financed or Extended |  |  | $ 155,000 |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 97,732 |  |  |  |  |  |  |  |  |  |  |  |
Self Storage at Mid Rivers, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Financed or Extended |  |  | 5,987 |  |  |  |  |  |  |  |  |  |
Total borrowing capacity of loan |  |  | $ 5,987 |  |  |  |  |  |  |  |  |  |
Amount of loan guaranteed by the company (as a percent) |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Self Storage at Mid Rivers, LLC | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  | 2.75% |  |  |  |  |  |  |  |  |  |
Hammock Landing - Phase I |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Financed or Extended |  | $ 41,997 |  |  |  |  |  |  |  |  |  |  |
Hammock Landing - Phase I | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 2.25% |  |  |  |  |  |  |  |  |  |  | 2.00%
Hammock Landing - Phase II |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Financed or Extended |  | $ 16,217 |  |  |  |  |  |  |  |  |  |  |
Hammock Landing - Phase II | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 2.25% |  |  |  |  |  |  |  |  |  |  | 2.00%
The Pavilion at Port Orange |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Financed or Extended |  | $ 56,738 |  |  |  |  |  |  |  |  |  |  |
Amount of loan guaranteed by the company (as a percent) |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
The Pavilion at Port Orange | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 2.25% |  |  |  |  |  |  |  |  |  |  | 2.00%
Ambassador Infrastructure, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Financed or Extended |  |  |  |  |  | $ 11,035 |  |  |  |  |  |  |
Ambassador Infrastructure, LLC | Interest Rate Swap |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate swaps held |  |  |  |  |  | $ 9,360 |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  |  | 3.74% |  |  |  |  |  |  |
Ambassador Infrastructure, LLC | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 2.00% |  |  |  |  |  |  |
Shoppes at Eagle Point, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Financed or Extended |  |  |  |  | $ 36,400 |  |  |  |  |  |  |  |
Amount of loan guaranteed by the company (as a percent) |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Number of extension options available | extension_option |  |  |  |  | 1 |  |  |  |  |  |  |  |
Term of extension option |  |  |  |  | 2 years |  |  |  |  |  |  |  |
Shoppes at Eagle Point, LLC | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 2.35% | 2.75% |  |  |  |  | 2.35% |  |  |
Storage Facility Development - EastGate Mall |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount Financed or Extended |  |  |  | $ 6,500 |  |  |  |  |  |  |  |  |
Amount of loan guaranteed by the company (as a percent) |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Storage Facility Development - EastGate Mall | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 2.75% |  |  |  |  |  | 2.75% |  |  |
Parent Company | CoolSprings Galleria |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Parent Company | Self Storage at Mid Rivers, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Parent Company | Shoppes at Eagle Point, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 50.00% |
Corporate Joint Venture | CoolSprings Galleria |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Corporate Joint Venture | Self Storage at Mid Rivers, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  | 50.00% |  |  |  |  |  |  |  |  |  |
Corporate Joint Venture | Shoppes at Eagle Point, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest in joint venture (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 50.00% |

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