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Fair Value Measurements (Summary of Asset Impairment and Decommission Costs) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Asset impairment | $ 14,350 | $ 15,389 | $ 19,217
Other (including third party decommission costs) | 1,989 | 4,447 | 6,977
Total asset impairment and decommission costs | 27,134 | 36,697 | 30,242
Fiber Assets [Member] |  |  |
Gain on sale of fiber assets |  |  | (8,919)
Decommissioned Towers [Member] |  |  |
Write-off carrying value of decommissioned towers | $ 10,795 | $ 16,861 | $ 12,967

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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