Acquisitions (Schedule of Acquisition Capital Expenditures) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Acquisitions [Abstract]
Acquisitions of towers and related intangible assets	$ 21,895	$ 99,173	$ 121,319	$ 224,585
Land buyouts and other assets	58,969	33,346	78,580	59,116
Total cash acquisition capital expenditures	80,864	132,519	199,899	283,701
Acquisition costs paid through the issuance of common stock				$ 1,700
Common stock issued for acquisition costs				10,000
Ground lease extensions	$ 2,300	$ 7,000	$ 5,900	$ 13,100