Assets Held for Sale, Number of Properties Held for Sale

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Assets Held for Sale, Number of Properties Sold

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Gain (Loss) on Sale of Properties, Deferred

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Proceeds from Federal Communications Commission spectrum auction

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Amount of gain (loss) on sale or disposal of intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7,9)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
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A description of the terms of the lease(s) related to the assets being leased-back in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 40
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77913982&loc=d3e50796-112755

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Assets Held For Sale and Sales of Real Estate Narrative (Details) $ in Thousands					3 Months Ended	6 Months Ended	12 Months Ended
	May 22, 2017 USD ($) property	Apr. 21, 2017 USD ($) property	Jan. 31, 2017 USD ($) property	Jan. 26, 2017 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2018 property
Long Lived Assets Held-for-sale [Line Items]
Assets Held for Sale, Number of Properties Held for Sale \| property								1
Assets Held for Sale, Number of Properties Sold						6
Proceeds from sale of real estate						$ 60,000
Proceeds from FCC spectrum auction							$ 172,000
FCC Licenses
Long Lived Assets Held-for-sale [Line Items]
(Gain) Loss on Disposition of Intangible Assets					$ (133,000)
Denver, CO Property
Long Lived Assets Held-for-sale [Line Items]
Proceeds from sale of real estate				$ 23,000
Chicago, IL Property
Long Lived Assets Held-for-sale [Line Items]
Assets Held for Sale, Number of Properties Sold \| property		2	1
Proceeds from sale of real estate		$ 505	$ 22,000
Sale Leaseback Transaction, Lease Terms			P10Y
(Gain) loss on sales of real estate, deferred			$ (13,000)
Baltimore, MD Property
Long Lived Assets Held-for-sale [Line Items]
Assets Held for Sale, Number of Properties Sold \| property	2
Proceeds from sale of real estate	$ 15,000