Fair Value Measurements (Summary of Asset Impairment and Decommission Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Fair Value Measurements [Abstract]
Asset impairment	$ 22,427	$ 30,466
Write-off of carrying value of decommissioned towers	3,490	2,561
Other (including tower and equipment decommission costs)	3,383	3,999
Total asset impairment and decommission costs	$ 29,300	$ 37,026

The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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