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Fair Value Measurements (Summary of Asset Impairment and Decommission Costs) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value Measurements [Abstract] |  |  |  |
Asset impairment | $ 8,920 | $ 27,676 | $ 61,964 | $ 74,372
Write-off of carrying value of decommissioned towers | 698 | 1,619 | 12,242 | 4,451
Other (including tower and equipment decommission costs) | 3,052 | 3,768 | 13,722 | 13,497
Total asset impairment and decommission costs | $ 12,670 | $ 33,063 | $ 87,928 | $ 92,320

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