Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228

Name:	us-gaap_GainLossOnDispositionOfAssets1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

SUBSEQUENT EVENTS (Details) - Subsequent event - Disposal Group, Disposed of by Sale, Not Discontinued Operations - Asset Purchase Agreement $ in Millions		6 Months Ended
	May 04, 2018 item	Jun. 30, 2018 USD ($)
Forecast
SUBSEQUENT EVENT
Gain on sale of cell sites		$ 15.0
U.S. Telecom
SUBSEQUENT EVENT
Cell sites within buildout arrangement \| item	100
U.S. Telecom \| Forecast
SUBSEQUENT EVENT
Additional cash proceeds from transaction		$ 0.0