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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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