Acquisitions (Schedule of Acquisition Capital Expenditures) (Details) $ in Thousands		3 Months Ended			6 Months Ended
	Feb. 16, 2021 USD ($) item	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Business Acquisition [Line Items]
Acquisitions of towers and related intangible assets		$ 67,255	$ 77,100	$ 17,150	$ 168,885	$ 99,424
Acquisition of right-of-use assets		1,783			947,698
Land buyouts and other assets		8,137		12,354	13,268	19,611
Total cash acquisition capital expenditures		77,175		29,504	1,129,851	119,035
Ground lease extensions		$ 3,600		$ 1,600	$ 6,400	$ 3,600
Exclusive Right to Lease and Operate Utility Transmission Structures [Member]
Business Acquisition [Line Items]
Number of utility transmission structures acquired | item	699
Consideration transferred	$ 955,800
Lease term	70 years