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Broadcast Licenses, Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ 93,259 |  |  |  | $ 96,229 |  | $ 93,259 | $ 96,229 |
Acquisitions |  |  |  |  |  |  |  |  |  | 1,991 | 8,086 |
Dispositions |  |  |  |  |  |  |  |  |  |  | (9,607) |
Impairment charge | $ 0 | $ 0 | $ 0 | 0 | $ (1,449) | $ 0 | $ 0 | 0 | [1] | 0 | (1,449) | $ 0
Balance | 95,250 |  |  |  | 93,259 |  |  |  |  | 95,250 | 93,259 | 96,229
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 0 |  |  |  | 9,607 |  | 0 | 9,607 |
Acquisitions |  |  |  |  |  |  |  |  |  | 0 | 0 |
Dispositions |  |  |  |  |  |  |  |  |  |  | (9,607) |
Impairment charge |  |  |  |  |  |  |  |  |  |  | 0 |
Balance | 0 |  |  |  | 0 |  |  |  |  | 0 | 0 | 9,607
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ 93,259 |  |  |  | $ 86,622 |  | 93,259 | 86,622 |
Acquisitions |  |  |  |  |  |  |  |  |  | 1,991 | 8,086 |
Dispositions |  |  |  |  |  |  |  |  |  |  | 0 |
Impairment charge |  |  |  |  |  |  |  |  |  |  | (1,449) |
Balance | $ 95,250 |  |  |  | $ 93,259 |  |  |  |  | $ 95,250 | $ 93,259 | $ 86,622
[1] | March 31, 2017 quarterly data have been reclassified to conform with current presentation.

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