Segment Data (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of business segments | segment	2
Site leasing	$ 492,356	$ 452,183
Total assets	9,359,502		$ 9,759,941
Brazil [Member]
Segment Reporting Information [Line Items]
Site leasing	63,100	$ 56,000
Total assets	$ 1,069,200		$ 1,404,100