Acquisitions (Schedule of Acquisition Capital Expenditures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Acquisitions of towers and related intangible assets	$ 701,471	$ 406,699	$ 392,902
Land buyouts and other assets	72,486	45,130	48,645
Total cash acquisition capital expenditures	773,957	451,829	441,547
Acquisition costs paid through the issuance of common stock	$ 1,700		$ 63,300
Common stock issued for acquisition costs	10,000		487,963
Ground lease extensions	$ 15,200	$ 24,300	$ 18,800
Additional Interest In Unconsolidated Joint Venture [Member]
Business Acquisition [Line Items]
Consideration transferred	$ 72,000