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Acquisitions (Schedule of Acquisition Capital Expenditures) (Details) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Feb. 16, 2021 USD ($) item | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($)
Business Acquisition [Line Items] |  |  |
Acquisitions of towers and related intangible assets |  | $ 101,630 | $ 82,274
Acquisition of right-of-use assets |  | 945,915 |
Land buyouts and other assets |  | 5,131 | 7,257
Total cash acquisition capital expenditures |  | 1,052,676 | 89,531
Ground lease extensions |  | $ 2,800 | $ 1,700
Exclusive Right to Lease and Operate Utility Transmission Structures [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of utility transmission structures acquired | item | 697 |  |
Consideration transferred | $ 954,000 |  |
Lease term |  | 70 years |

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