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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues	$ 0	$ 19,956	$ 0	$ 53,652
Total costs and expenses		(27,043)	(600)	(72,106)
Depreciation and amortization of intangible assets				(1,157)
Other, net		(33)		(139)
Loss from operations		(7,120)	(600)	(19,750)
Pretax gain (loss) on disposal	520		9,572
Gain (loss) from discontinued operations before income taxes	520	(7,120)	8,972	(19,750)
Income tax provision (benefit)	188	(1,665)	2,145	(5,153)
Income (loss) from discontinued operations, net of tax	$ 332	$ (5,455)	$ 6,827	$ (14,597)

Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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