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Segment Data (Narrative) (Details)
$ in Thousands
12 Months Ended 36 Months Ended
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Segment Reporting Information [Line Items]        
Number of business segments | segment 2      
Number of reportable segments | segment 2      
Site leasing $ 1,860,858 $ 1,740,434 $ 1,623,173  
Total assets 9,759,941 7,213,707   $ 9,759,941
Brazil [Member]        
Segment Reporting Information [Line Items]        
Site leasing 226,700 221,500 $ 217,400  
Total assets $ 1,404,100 $ 1,031,600   $ 1,404,100
Revenue [Member] | Foreign Countries, Other than Brazil [Member] | Maximum [Member]        
Segment Reporting Information [Line Items]        
Concentration risk percentage of accounts receivable       3.00%