GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Oct. 01, 2018
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Goodwill, Impairment Loss						$ 17,412	$ 0
Pre Tax Impairment Charges						21,300	29,100
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		$ 12,700		$ 16,400		3,900
Indefinite-Lived License Agreements						600,134	614,535
Amortization of Intangible Assets						26,700	$ 26,900
Atlanta [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Goodwill, Impairment Loss						$ 14,700
Charlotte Goodwill [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Goodwill, Impairment Loss	$ 2,700
2017 Interim Impairment Testing [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Pre Tax Impairment Charges								$ 14,700
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			$ 12,700		$ 16,400
2018 Interim Impairment Testing [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 3,900