Acquisitions (Schedule of Acquisition Capital Expenditures) (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) shares
Business Acquisition [Line Items]
Acquisitions of towers and related intangible assets	$ 77,100	$ 274,752	$ 181,473	$ 701,471
Acquisition of right-of-use assets		950,536
Land buyouts and other assets		32,416	89,945	72,486
Total cash acquisition capital expenditures		1,257,704	271,418	773,957
Acquisition costs paid through the issuance of common stock				1,700
Ground lease extensions		$ 16,300	$ 12,300	15,200
Exclusive Right to Lease and Operate Utility Transmission Structures [Member]
Business Acquisition [Line Items]
Number of utility transmission structures acquired | item		713
Consideration transferred		$ 972,000
Finance lease term		70 years
Additional Interest In Unconsolidated Joint Venture [Member]
Business Acquisition [Line Items]
Consideration transferred				$ 72,000
Acquisitions of Towers and Related Intangible Assets [Member]
Business Acquisition [Line Items]
Common stock issued for acquisition costs | shares				10,000