GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS (Details 6) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Apr. 28, 2017
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Gross goodwill	$ 377,989	$ 373,379
Accumulated impairment losses	(115,095)	(115,095)
Additions	90	4,610
Impairments	(17,412)	0
Net goodwill at December 31, 2018	245,572	262,894	$ 4,600
Radio Broadcasting Segment [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Gross goodwill	154,910	154,863
Accumulated impairment losses	(84,436)	(84,436)
Additions	90	47
Impairments	(17,412)	0
Net goodwill at December 31, 2018	53,152	70,474
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 at December 31, 2018	14,354	14,354
Digital Segment [Member]
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Gross goodwill	27,567	23,004
Accumulated impairment losses	(14,545)	(14,545)
Additions	0	4,563
Impairments	0	0
Net goodwill at December 31, 2018	13,022	13,022
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 at December 31, 2018	$ 165,044	$ 165,044