Acquisitions (Schedule of Acquisition Capital Expenditures) (Details) $ in Thousands		3 Months Ended
	Feb. 16, 2021 USD ($) item	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Business Acquisition [Line Items]
Acquisitions of towers and related intangible assets		$ 101,630	$ 82,274
Acquisition of right-of-use assets		945,915
Land buyouts and other assets		5,131	7,257
Total cash acquisition capital expenditures		1,052,676	89,531
Ground lease extensions		$ 2,800	$ 1,700
Exclusive Right to Lease and Operate Utility Transmission Structures [Member]
Business Acquisition [Line Items]
Number of utility transmission structures acquired | item	697
Consideration transferred	$ 954,000
Lease term		70 years