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Unconsolidated Affiliates and Noncontrolling Interests - Loan Activity of Unconsolidated Affiliate (Details) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | May 31, 2018 USD ($) | Apr. 30, 2018 USD ($) | Sep. 30, 2018 extension_option
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of extensions | extension_option |  |  |  | 2
Length of extension |  |  |  | 1 year
LIBOR |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Stated Interest Rate (as a percent) |  |  |  | 2.00%
CoolSprings Galleria |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Stated Interest Rate (as a percent) |  |  | 4.839% | 6.98%
Amount Financed or Extended |  |  | $ 155,000 |
Repayments of debt | $ 97,732 |  |  |
Self Storage at Mid Rivers, LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Amount Financed or Extended |  |  | $ 5,987 |
Amount guaranteed by the operating partnership (as a percent) |  |  |  | 100.00%
Self Storage at Mid Rivers, LLC | LIBOR |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Stated Interest Rate (as a percent) |  |  | 2.75% |
Hammock Landing - Phase I |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Amount Financed or Extended |  | $ 41,997 |  |
Hammock Landing - Phase I | LIBOR |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Stated Interest Rate (as a percent) |  | 2.25% |  |
Hammock Landing - Phase II |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Amount Financed or Extended |  | $ 16,217 |  |
Hammock Landing - Phase II | LIBOR |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Stated Interest Rate (as a percent) |  | 2.25% |  |
The Pavilion at Port Orange |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Amount Financed or Extended |  | $ 56,738 |  |
Amount guaranteed by the operating partnership (as a percent) |  |  |  | 50.00%
The Pavilion at Port Orange | LIBOR |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Stated Interest Rate (as a percent) |  | 2.25% |  |

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