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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Fair Value Measurements [Abstract] |  |  |  |
Asset impairment | $ 20,013 | $ 8,920 | $ 91,054 | $ 61,964
Write-off of carrying value of decommissioned towers | 186 | 698 | 6,105 | 12,242
Other (including tower and equipment decommission costs) | 123 | 3,052 | 5,419 | 13,722
Total asset impairment and decommission costs | $ 20,322 | $ 12,670 | $ 102,578 | $ 87,928

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