GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS - Reach Media Segment Goodwill (Details) - USD ($)			12 Months Ended
	Oct. 01, 2021	Oct. 01, 2020	Dec. 31, 2021	Dec. 31, 2020
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Pre-tax impairment charge			$ 0	$ 84,400,000
Reach Media Segment Goodwill [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Pre-tax impairment charge	$ 0	$ 0
Discount Rate	11.50%	11.00%
Year 1 Revenue Growth Rate	(15.70%)	22.10%
Long-term Revenue Growth Rate (Year 5)	1.00%	1.00%
Long-term market revenue growth rate period	5 years	5 years
Minimum | Reach Media Segment Goodwill [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Operating Profit Margin Range	24.10%	18.00%
Maximum | Reach Media Segment Goodwill [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Operating Profit Margin Range	26.20%	19.10%