Assets Held for Sale and Discontinued Operations - Operating Results of Discontinued Operations (Details) - Disposed of by sale - Stitcher Podcasting Business - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues	$ 19,956	$ 18,937	$ 53,652	$ 51,108
Total costs and expenses	(27,043)	(23,414)	(72,106)	(65,758)
Depreciation and amortization of intangible assets		(580)	(1,157)	(2,071)
Other, net	(33)		(139)
Loss from discontinued operations before income taxes	(7,120)	(5,057)	(19,750)	(16,721)
Benefit for income taxes	(1,665)	(628)	(5,153)	(2,634)
Net loss from discontinued operations	$ (5,455)	$ (4,429)	$ (14,597)	$ (14,087)