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Segment Data (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of business segments | segment	2
Site leasing	$ 505,103	$ 492,356
Total assets	$ 9,763,460		$ 9,158,018
Site Leasing Revenue [Member]
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Brazil [Member]
Segment Reporting Information [Line Items]
Site leasing	$ 55,400	$ 63,100
Total assets	$ 900,000		$ 1,000,000

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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