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Unconsolidated Affiliates and Noncontrolling Interests - Financings of Unconsolidated Affiliates (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Parkdale Self Storage, LLC
Schedule of Equity Method Investments [Line Items]
Stated interest rate (as a percent)	5.25%
Total Outstanding	$ 6,500
Principal Amount Outstanding of Loans Held-in-portfolio	$ 189
Company's Ownership Interest (as a percent)	50.00%
Maximum guarantee (as a percent)	100.00%
Parkdale Self Storage, LLC | LIBOR
Schedule of Equity Method Investments [Line Items]
Basis spread on variable rate (as a percent)	2.80%
Hamilton Place Self Storage, LLC
Schedule of Equity Method Investments [Line Items]
Total Outstanding	$ 7,002
Company's Ownership Interest (as a percent)	54.00%
Maximum guarantee (as a percent)	100.00%
Maximum guarantee, backup guaranty (as a percent)	50.00%

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