GOODWILL AND RADIO BROADCASTING LICENSES - Valuation of Broadcasting Licenses (Details) - Radio Broadcasting Licenses [Member]
$ in Millions
Mar. 31, 2020
USD ($)
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]  
Impairment charge (in millions) $ 47.7
Discount Rate 9.50%
Year 1 Market Revenue Growth Rate Range (13.30%)
Maximum [Member]  
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]  
Long-term Market Revenue Growth Rate Range (Years 6 - 10) 1.10%
Mature Market Share Range 25.00%
Mature Operating Profit Margin Range 39.70%
Minimum [Member]  
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]  
Long-term Market Revenue Growth Rate Range (Years 6 - 10) 0.70%
Mature Market Share Range 6.90%
Mature Operating Profit Margin Range 27.60%