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Asset Write-Downs and Other Charges and Credits (Details) - USD ($) $ in Thousands		3 Months Ended					9 Months Ended
	Mar. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquisition and related integration costs		$ 251				$ 10,928	$ 35,582	$ 16,059
Restructuring impairment charges				$ 7,100			7,050	0
Loss on extinguishment of debt		0				0	13,775	0
Gains on sale of business		0			$ 6,500	0	81,784	0
Losses on stock warrants		0				$ 0	99,118	$ 0
Restructuring costs							$ 9,400
Building \| Denver KMGH Station
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) on Sale of Assets and Asset Impairment Charges		$ 32,600
Senior unsecured notes, due in 2025 \| Senior Notes
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on extinguishment of debt			$ 13,800
Triton Digital Media \| Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of business				225,000
Gains on sale of business	$ 81,800			$ 81,800