Building and Land Acquisitions - Cash (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) buildings loans	Dec. 31, 2020 USD ($) loans buildings	Dec. 31, 2019 USD ($) loans buildings
Property, Plant and Equipment [Line Items]
Number of Real Estate Properties | buildings	8	10	6
Acquisition of buildings and related intangible assets	$ 447,584	$ 383,672	$ 210,224
Acres of Land | loans	536	250	517
Payments to Acquire Land	$ 700,632	$ 248,413	$ 388,202
Issuance of Limited Partner Units for acquisition	11,603	0	0
Series of Individually Immaterial Asset Acquisitions
Property, Plant and Equipment [Line Items]
Acquisition of buildings and related intangible assets	64,000
Payments to Acquire Land	163,700	$ 13,100	$ 160,400
Issuance of Limited Partner Units for acquisition	$ 11,600