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Investments in Real Estate (Details) ft² in Thousands, $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($) a property	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($) a ft² property	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($) a ft² property	Jun. 30, 2018 USD ($) a ft² property	Dec. 31, 2018 ft²	Jun. 30, 2019 property	Jun. 30, 2019 ft²
Finite-Lived Intangible Assets [Line Items]
Revenues	$ 41,730		$ 37,238		$ 82,610	$ 74,345
Net income	10,379	$ 15,532	20,137	$ 10,057	25,911	30,194
Capitalized interest associated with redevelopment activities	$ 800		600		1,600	800
Industrial building | Miami | Held-for-sale | Third-party purchaser
Finite-Lived Intangible Assets [Line Items]
Sales price					$ 14,000
Improved land parcels
Finite-Lived Intangible Assets [Line Items]
Number of buildings | property								17
Area of real estate property | ft²									13,000
Redevelopment property
Finite-Lived Intangible Assets [Line Items]
Number of buildings | property								4
Area of real estate property	74.7				74.7				600
Asset acquisition, consideration transferred					$ 129,300
Asset acquisition, real estate development costs					51,300
Redevelopment property, held for sale
Finite-Lived Intangible Assets [Line Items]
Number of buildings | property								1
Redevelopment property, held for sale | Miami | Held-for-sale
Finite-Lived Intangible Assets [Line Items]
Number of buildings | property								1
Asset Acquisitions 2019
Finite-Lived Intangible Assets [Line Items]
Purchase price	$ 51,200				119,400
Finite-lived intangible assets acquired	3,300				7,200
Asset acquisition, intangible liabilities	3,100				6,400
Revenues	1,200				1,400
Net income	$ 600				700
Asset Acquisitions 2019 | Woodside
Finite-Lived Intangible Assets [Line Items]
Area of real estate property | ft²									65
Asset acquisition, consideration transferred					$ 10,000
Asset Acquisitions 2019 | Industrial building
Finite-Lived Intangible Assets [Line Items]
Number of properties acquired | property	2				4
Area of real estate property acquired | ft²					165		119
Asset Acquisitions 2019 | Improved land parcels
Finite-Lived Intangible Assets [Line Items]
Number of properties acquired | property					2
Area of real estate property acquired | a					19.7
Asset Acquisitions 2019 | Land
Finite-Lived Intangible Assets [Line Items]
Asset acquisition, property additions	$ 34,800				$ 94,400
Asset Acquisitions 2019 | Building
Finite-Lived Intangible Assets [Line Items]
Asset acquisition, property additions	$ 13,100				$ 17,800
Asset Acquisitions 2018
Finite-Lived Intangible Assets [Line Items]
Purchase price			15,800			103,700
Finite-lived intangible assets acquired			1,300			3,900
Asset acquisition, intangible liabilities			400			2,700
Revenues			800			1,100
Net income			$ 300			$ 400
Asset Acquisitions 2018 | Industrial building
Finite-Lived Intangible Assets [Line Items]
Number of properties acquired | property			2			5
Area of real estate property acquired | ft²			50			468
Asset Acquisitions 2018 | Improved land parcels
Finite-Lived Intangible Assets [Line Items]
Number of properties acquired | property			1			1
Area of real estate property acquired | a			3.5			3.5
Asset Acquisitions 2018 | Redevelopment property
Finite-Lived Intangible Assets [Line Items]
Number of properties acquired | property						2
Area of real estate property acquired | ft²						318
Asset Acquisitions 2018 | Land
Finite-Lived Intangible Assets [Line Items]
Asset acquisition, property additions			$ 10,800			$ 74,400
Asset Acquisitions 2018 | Building
Finite-Lived Intangible Assets [Line Items]
Asset acquisition, property additions			$ 3,700			$ 25,400

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