GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS (Details 3) - USD ($) $ in Millions	Dec. 31, 2018	Oct. 01, 2018	Dec. 31, 2017	Oct. 01, 2017
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Impairment charge (in millions)	$ 21.3		$ 29.1
Reach Media Segment Goodwill [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Impairment charge (in millions)		$ 0.0		$ 0.0
Discount Rate		10.50%		10.50%
Year 1 Revenue Growth Rate		2.30%		(11.30%)
Long-term Revenue Growth Rate (Year 5)		1.00%		1.00%
Minimum [Member] | Reach Media Segment Goodwill [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Operating Profit Margin Range		14.60%		13.50%
Maximum [Member] | Reach Media Segment Goodwill [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Operating Profit Margin Range		15.80%		15.90%