Investments in Real Estate - Narrative (Details) $ in Thousands, ft² in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) ft² property	Mar. 31, 2020 USD ($) property
Finite-Lived Intangible Assets
Rental revenues and tenant expense reimbursements	$ 50,691	$ 45,116
Net income	$ 16,257	12,856
Redevelopment property
Finite-Lived Intangible Assets
Number of properties | property	2
Area of real estate property | ft²	0.3
Asset acquisition, consideration transferred	$ 71,600
Asset acquisition, real estate development costs	65,900
Capitalized interest associated with redevelopment activities	0	700
Asset Acquisitions 2021
Finite-Lived Intangible Assets
Asset acquisitions, assets acquired and liabilities assumed, net	109,900
Finite-lived intangible assets acquired	4,400
Asset acquisition, liabilities	5,600
Rental revenues and tenant expense reimbursements	500
Net income	$ 300
Asset Acquisitions 2021 | Industrial building
Finite-Lived Intangible Assets
Number of properties | property	4
Asset Acquisitions 2021 | Land
Finite-Lived Intangible Assets
Asset acquisition, property additions	$ 63,700
Asset Acquisitions 2021 | Building
Finite-Lived Intangible Assets
Asset acquisition, property additions	$ 41,800
Asset Acquisitions 2020
Finite-Lived Intangible Assets
Asset acquisitions, assets acquired and liabilities assumed, net		30,600
Finite-lived intangible assets acquired		1,100
Asset acquisition, liabilities		500
Rental revenues and tenant expense reimbursements		100
Net income		$ 100
Asset Acquisitions 2020 | Industrial building
Finite-Lived Intangible Assets
Number of properties | property		2
Asset Acquisitions 2020 | Land
Finite-Lived Intangible Assets
Asset acquisition, property additions		$ 21,900
Asset Acquisitions 2020 | Building
Finite-Lived Intangible Assets
Asset acquisition, property additions		$ 7,600