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Investments in Unconsolidated Entities - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended		13 Months Ended
	Sep. 30, 2014 USD ($) ft²	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($) ft²	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($) ft²	Jun. 30, 2019 USD ($)	Sep. 09, 2014
Schedule of Equity Method Investments [Line Items]
Equity contribution				$ 0	$ 3,264
Equity in other comprehensive income (loss) of unconsolidated joint venture		$ (89)	$ 9	$ (178)	$ 236
Heritage Common X
Schedule of Equity Method Investments [Line Items]
Area of real estate property (in sqft) | ft²			200,000		200,000
Total project budget			$ 48,100		$ 48,100
Equity method investment, liabilities			41,400		41,400
Equity contributed by the members of joint venture			$ 6,700		$ 6,700
Equity method investment, ownership (percent)		45.00%		45.00%		45.00%
Equity contribution						$ 3,100
Equity in other comprehensive income (loss) of unconsolidated joint venture				$ 0
Digital Realty Joint Venture
Schedule of Equity Method Investments [Line Items]
Area of real estate property (in sqft) | ft²	132,300
Equity method investment, liabilities	$ 102,000
Equity method investment, ownership (percent)	80.00%						80.00%
Payments to acquire interest in equity method investment	$ 68,400
Equity method investment, property	$ 187,500
Operating leases, term of contract	4 years
Equity in other comprehensive income (loss) of unconsolidated joint venture				$ (178)

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