Fair Value Measurements (Summary of Asset Impairment and Decommission Costs) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Fair Value Measurements [Abstract] | ||||
| Asset impairment | $ 11,298 | $ 20,013 | $ 46,735 | $ 91,054 |
| Write-off of carrying value of decommissioned towers | 1,454 | 2,830 | 10,972 | 8,960 |
| Other (including tower and equipment decommission costs) | 708 | (2,521) | 7,619 | 2,564 |
| Total asset impairment and decommission costs | $ 13,460 | $ 20,322 | $ 65,326 | $ 102,578 |