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Acquisitions (Schedule of Acquisition Capital Expenditures) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Acquisitions [Abstract]      
Acquisitions of towers and related intangible assets $ 406,699 $ 392,902 $ 214,686
Land buyouts and other assets 45,130 48,645 62,149
Total cash acquisition capital expenditures 451,829 441,547 276,835
Acquisition costs paid through the issuance of common stock   $ 63,300  
Common stock issued for acquisition costs   487,963  
Ground lease extensions $ 24,300 $ 18,800 $ 14,100