GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS - Valuation of Broadcasting Licenses (Details) - Radio Broadcasting Licenses [Member] $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Pre-tax impairment charge	$ 12.6	$ 12.6
Discount Rate	9.50%	9.50%
Minimum
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Year 1 Market Revenue Growth Rate Range	1.40%	1.40%
Long-term Market Revenue Growth Rate Range (Years 6 - 10)	0.70%	0.70%
Mature Market Share Range	6.20%	6.20%
Operating Profit Margin Range	28.30%	28.30%
Maximum
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Year 1 Market Revenue Growth Rate Range	1.80%	1.80%
Long-term Market Revenue Growth Rate Range (Years 6 - 10)	1.00%	1.00%
Mature Market Share Range	23.20%	23.20%
Operating Profit Margin Range	36.10%	36.10%