GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Apr. 28, 2017
Schedule of GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS [Line Items]
Gross goodwill	$ 373,379	$ 373,379
Accumulated impairment losses	(115,095)	(115,095)
Additions	4,610	0
Impairments	0	0
Net goodwill	262,894	258,284	$ 4,600
Radio Broadcasting Segment [Member]
Schedule of GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS [Line Items]
Gross goodwill	154,863	154,863
Accumulated impairment losses	(84,436)	(84,436)
Additions	47	0
Impairments	0	0
Net goodwill	70,474	70,427
Reach Media Segment [Member]
Schedule of GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS [Line Items]
Gross goodwill	30,468	30,468
Accumulated impairment losses	(16,114)	(16,114)
Additions	0	0
Impairments	0	0
Net goodwill	14,354	14,354
Digital Segment [Member]
Schedule of GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS [Line Items]
Gross goodwill	23,004	23,004
Accumulated impairment losses	(14,545)	(14,545)
Additions	4,563	0
Impairments	0	0
Net goodwill	13,022	8,459
Cable Television Segment [Member]
Schedule of GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS [Line Items]
Gross goodwill	165,044	165,044
Accumulated impairment losses	0	0
Additions	0	0
Impairments	0	0
Net goodwill	$ 165,044	$ 165,044