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Intangible Assets, Goodwill and Other (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets, gross $ 7,997,000 $ 7,940,000  
Accumulated amortization of intangible assets (3,951,000) (3,507,000)  
Finite-Lived Intangible Assets, Net 4,046,000 4,433,000  
Amortization expense 444,000 439,000 $ 428,000
Estimated annual amortization expense related to intangible assets - Year 1 447,000    
Estimated annual amortization expense related to intangible assets - Year 2 445,000    
Estimated annual amortization expense related to intangible assets - Year 3 396,000    
Estimated annual amortization expense related to intangible assets - Year 4 374,000    
Estimated annual amortization expense related to intangible assets - Year 5 370,000    
Site Rental Contracts and Customer Relationships [Member]      
Goodwill and Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets, gross 7,854,000 7,797,000  
Accumulated amortization of intangible assets (3,872,000) (3,432,000)  
Finite-Lived Intangible Assets, Net 3,982,000 4,365,000  
Other Intangible Assets [Member]      
Goodwill and Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets, gross 143,000 143,000  
Accumulated amortization of intangible assets (79,000) (75,000)  
Finite-Lived Intangible Assets, Net $ 64,000 $ 68,000