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Broadcast Licenses, Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | [1] | Jun. 30, 2016 | [1] | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ 86,622 |  |  |  |  |  | $ 88,106 |  |  | $ 86,622 | $ 88,106 |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  | 8,086 | 8,123 |
Dispositions |  |  |  |  |  |  |  |  |  |  |  |  | (9,607) |  |
Impairment charge | $ (1,449) | $ 0 | $ 0 | 0 | [1] | $ 0 | [1] | $ 0 | $ 0 | 0 | [1] | $ (874) | (1,449) | 0 | $ (874)
Balance | 93,259 |  |  |  |  | 86,622 |  |  |  |  |  | 88,106 | 93,259 | 86,622 | 88,106
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 9,607 |  |  |  |  |  | 9,607 |  |  | 9,607 | 9,607 |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Dispositions |  |  |  |  |  |  |  |  |  |  |  |  | (9,607) |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Balance | 0 |  |  |  |  | 9,607 |  |  |  |  |  | 9,607 | 0 | 9,607 | 9,607
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ 86,622 |  |  |  |  |  | $ 78,499 |  |  | 86,622 | 78,499 |
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  | 8,086 | 8,123 |
Dispositions |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  |  |  | (1,449) |  |
Balance | $ 93,259 |  |  |  |  | $ 86,622 |  |  |  |  |  | $ 78,499 | $ 93,259 | $ 86,622 | $ 78,499
[1] | Certain prior year amounts and March 31, 2017 quarterly data have been reclassified to conform with current presentation.

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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the capitalized costs to acquire rights under a license arrangement (for example, to sell specified products in a specified territory) having an indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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