Real Estate Investments and Related Intangibles - Property Acquisitions (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) property	Sep. 30, 2020 USD ($) property
Acquisitions, 2021 [Member]
Business Acquisition [Line Items]
Number of properties acquired | property	134
Total purchase price of assets acquired	$ 419,181
Capitalized acquisition costs	4,000
Acquisitions, 2020 [Member]
Business Acquisition [Line Items]
Number of properties acquired | property		25
Total purchase price of assets acquired		$ 147,121
Build-to-suit Development Project [Member] | Acquisitions, 2021 [Member]
Business Acquisition [Line Items]
Capitalized acquisition costs	$ 900
Number of real estate properties acquired | property	1
Development in process	$ 45,500