Real Estate Investments and Related Intangibles - Property Acquisitions (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) property	Mar. 31, 2020 USD ($) property
Acquisitions, 2021 [Member]
Business Acquisition [Line Items]
Number of properties acquired | property	54
Total purchase price of assets acquired	$ 140,084
Capitalized acquisition costs	1,600
Acquisitions, 2020 [Member]
Business Acquisition [Line Items]
Number of properties acquired | property		25
Total purchase price of assets acquired		$ 147,121
Capitalized acquisition costs		$ 900
Build-to-suit Development Project [Member]
Business Acquisition [Line Items]
Capitalized acquisition costs	$ 700
Number of real estate properties acquired | property	1
Development in process	$ 37,300
Development in process, remaining committed investments	$ 7,900
Build-to-suit Development Project [Member] | Acquisitions, 2020 [Member]
Business Acquisition [Line Items]
Number of real estate properties acquired | property		1