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Segment Data (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items]      
Number of business segments | segment 2    
Number of reportable segments | segment 2    
Site leasing $ 1,740,434 $ 1,623,173 $ 1,538,070
Total assets 7,213,707 7,320,205  
Brazil [Member]      
Segment Reporting Information [Line Items]      
Site leasing 221,500 217,400 $ 178,300
Total assets $ 1,031,600 $ 1,278,900