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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

Asset impairment and decommission costs.

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Impairment of Long-Lived Assets Held-for-use, Additions

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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

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2611-110228

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The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

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-Name Accounting Standards Codification
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