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	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues	$ 0	$ 16,568	$ 0	$ 33,696
Total costs and expenses	(600)	(22,261)	(600)	(45,063)
Depreciation and amortization of intangible assets		(587)		(1,157)
Other, net		(106)		(106)
Loss from operations	(600)	(6,386)	(600)	(12,630)
Pretax gain (loss) on disposal	6,366		9,052
Gain (loss) from discontinued operations before income taxes	5,766	(6,386)	8,452	(12,630)
Income tax provision (benefit)	1,335	(1,855)	1,957	(3,488)
Income (loss) from discontinued operations, net of tax	$ 4,431	$ (4,531)	$ 6,495	$ (9,142)

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

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