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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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