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Investments in Real Estate - Narrative (Details) ft² in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019 USD ($) a ft² property	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) ft²	Sep. 30, 2018 USD ($) ft² a property	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2019 USD ($) ft² a property	Sep. 30, 2018 USD ($) a ft² property	Sep. 30, 2019 property	Sep. 30, 2019 a
Finite-Lived Intangible Assets [Line Items]
Revenues	$ 43,397			$ 37,899			$ 126,007	$ 112,244
Net income	14,784	$ 10,379	$ 15,532	10,122	$ 20,137	$ 10,057	40,695	40,317
Capitalized interest associated with redevelopment activities	$ 900			800			$ 2,500	1,600
Improved land parcels
Finite-Lived Intangible Assets [Line Items]
Number of properties | property									18
Area of real estate property | ft²	13,400						13,400
Redevelopment property
Finite-Lived Intangible Assets [Line Items]
Number of properties | property									4
Area of real estate property	500						500			76.7
Asset acquisition, consideration transferred							$ 120,300
Asset acquisition, real estate development costs							52,400
Redevelopment property | Miami | 1775 NW 70th Avenue, Miami, Florida
Finite-Lived Intangible Assets [Line Items]
Area of real estate property | ft²			65
Asset acquisition, consideration transferred			$ 10,000
Asset Acquisitions 2019
Finite-Lived Intangible Assets [Line Items]
Purchase price	$ 148,300						267,700
Finite-lived intangible assets acquired	4,300						11,500
Asset acquisition, intangible liabilities	3,500						9,900
Revenues	2,400						3,800
Net income	$ 900						$ 1,600
Asset Acquisitions 2019 | Industrial building
Finite-Lived Intangible Assets [Line Items]
Number of properties acquired | property	11						15
Area of real estate property acquired | ft²	442						608
Asset Acquisitions 2019 | Improved land parcels
Finite-Lived Intangible Assets [Line Items]
Number of properties acquired | property	1						3
Area of real estate property acquired | a	2.0						21.7
Asset Acquisitions 2019 | Land
Finite-Lived Intangible Assets [Line Items]
Asset acquisition, property additions	$ 118,600						$ 213,000
Asset Acquisitions 2019 | Building
Finite-Lived Intangible Assets [Line Items]
Asset acquisition, property additions	$ 25,400						$ 43,200
Asset Acquisitions 2018
Finite-Lived Intangible Assets [Line Items]
Purchase price				70,400				174,100
Finite-lived intangible assets acquired				3,500				7,400
Asset acquisition, intangible liabilities				1,900				4,600
Revenues				1,200				2,300
Net income				$ 400				$ 800
Asset Acquisitions 2018 | Industrial building
Finite-Lived Intangible Assets [Line Items]
Number of properties acquired | property				8				13
Area of real estate property acquired | ft²				407				875
Asset Acquisitions 2018 | Improved land parcels
Finite-Lived Intangible Assets [Line Items]
Number of properties acquired | property				2				3
Area of real estate property acquired | a				1.4				5.0
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				$ 44,600				$ 119,000
Asset Acquisitions 2018 | Building
Finite-Lived Intangible Assets [Line Items]
Asset acquisition, property additions				$ 22,300				$ 47,700

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