Assets Held for Sale and Discontinued Operations - Operating Results of Discontinued Operations (Details) - Radio Segment - Held-for-sale - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues	$ 13,299	$ 14,429
Total costs and expenses	(11,516)	(12,190)
Depreciation and amortization of intangibles	0	(863)
Impairment of goodwill	(20,000)	0
Other, net	(148)	(40)
Income (loss) from discontinued operations before income taxes	(18,365)	1,336
Provision (benefit) for income taxes	139	542
Net income (loss) from discontinued operations	$ (18,504)	$ 794

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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