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UNCONSOLIDATED AFFILIATES AND COST METHOD INVESTMENT - Company Investments (Details) - entity	Dec. 31, 2018	Apr. 30, 2018	Nov. 30, 2017	Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]
Number of entities - equity method of accounting (entity)	21
Number of 50/50 joint ventures	15
Parent Company | EastGate Storage, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)			50.00%
Parent Company | Self Storage at Mid Rivers, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)		50.00%
Parent Company | Shoppes at Eagle Point, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)				50.00%
Minimum
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)	10.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Ownership interest in joint venture (as a percent)	65.00%

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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