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Unconsolidated Affiliates and Noncontrolling Interests - Narrative (Details) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	May 31, 2019 USD ($)	Jan. 31, 2019 USD ($)	Jun. 30, 2019 USD ($) entity	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) entity	Jun. 30, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of equity method investment entities | entity			22		22
Number of joint ventures | entity			15		15
Number of variable interest entities | entity					19
Gain on sales of real estate assets | $			$ 5,527	$ 3,747	$ 5,755	$ 8,118
Minimum
Schedule of Equity Method Investments [Line Items]
Equity interest in real estate property (as a percent)			10.00%		10.00%
Ownership in variable interest entity (as a percent)					50.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Equity interest in real estate property (as a percent)			65.00%		65.00%
Ownership in variable interest entity (as a percent)					95.00%
Bullseye, LLC
Schedule of Equity Method Investments [Line Items]
Ownership in variable interest entity (as a percent)					20.00%
Parkdale Self Storage, LLC
Schedule of Equity Method Investments [Line Items]
Equity interest in real estate property (as a percent)			50.00%		50.00%
Gain on sales of real estate assets | $	$ 433
Bullseye, LLC
Schedule of Equity Method Investments [Line Items]
Payments to acquire land | $		$ 3,310

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