GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS - Intangible Assets Excluding Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 306,515	$ 306,404
Less: Accumulated amortization	(248,303)	(236,313)
Other intangible assets, net	$ 58,212	70,091
Remaining Weighted-Average Period of Amortization	4 years 4 months 24 days
Trade names [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 17,413	17,391
Remaining Weighted-Average Period of Amortization	5 years
Trade names [Member] | Maximum [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Period of Amortization	5 years
Trade names [Member] | Minimum [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Period of Amortization	1 year
Intellectual property [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 9,531	9,531
Remaining Weighted-Average Period of Amortization	0 years
Intellectual property [Member] | Maximum [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Period of Amortization	10 years
Intellectual property [Member] | Minimum [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Period of Amortization	4 years
Affiliate agreements [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 178,986	178,986
Finite-Lived Intangible Asset, Period of Amortization	8 years
Remaining Weighted-Average Period of Amortization	0 years
Acquired income leases [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 127	127
Remaining Weighted-Average Period of Amortization	11 years 1 month 6 days
Acquired income leases [Member] | Maximum [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Period of Amortization	15 years
Acquired income leases [Member] | Minimum [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Period of Amortization	3 years
Advertiser agreements [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 46,789	46,789
Remaining Weighted-Average Period of Amortization	3 years 2 months 12 days
Advertiser agreements [Member] | Maximum [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Period of Amortization	12 years
Advertiser agreements [Member] | Minimum [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Period of Amortization	1 year
Favorable office and transmitter leases [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 2,097	2,097
Remaining Weighted-Average Period of Amortization	39 years 1 month 6 days
Favorable office and transmitter leases [Member] | Maximum [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Period of Amortization	60 years
Favorable office and transmitter leases [Member] | Minimum [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Period of Amortization	2 years
Brand names [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 4,413	4,413
Finite-Lived Intangible Asset, Period of Amortization	10 years
Remaining Weighted-Average Period of Amortization	7 years 2 months 12 days
Brand names - unamortized [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 39,690	39,690
Remaining Weighted-Average Period of Amortization	0 years
ABL facility debt costs [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 510	421
Remaining Weighted-Average Period of Amortization	1 year 3 months 18 days
Launch assets [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 6,284	6,284
Remaining Weighted-Average Period of Amortization	5 years 7 months 6 days
Other intangibles [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 675	$ 675
Remaining Weighted-Average Period of Amortization	1 year 4 months 24 days
Other intangibles [Member] | Maximum [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Period of Amortization	5 years
Other intangibles [Member] | Minimum [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Period of Amortization	1 year