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Fair Value Measurements (Summary of Asset Impairment and Decommission Costs) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value Measurements [Abstract] |  |  |  |
Asset impairment | $ 40,575 | $ 18,491 | $ 71,041 | $ 53,043
Write-off of carrying value of decommissioned towers | 3,358 | 7,440 | 5,919 | 11,545
Other (including tower and equipment decommission costs) | 1,298 | 5,679 | 5,297 | 10,670
Total asset impairment and decommission costs | $ 45,231 | $ 31,610 | $ 82,257 | $ 75,258

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