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Fair Value Measurements (Summary of Asset Impairment and Decommission Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value Measurements [Abstract] |  |  |
Asset impairment | $ 139,466 | $ 34,734 | $ 24,813
Right-of-use asset impairment | 45,100 |  |
Write-off of carrying value of decommissioned towers | 12,015 | 8,095 | 6,349
Other (including tower and equipment decommission costs) | 17,906 | 331 | 1,882
Total asset impairment and decommission costs | $ 169,387 | $ 43,160 | $ 33,044

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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482130/360-10-45-15 + Details
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