GOODWILL AND RADIO BROADCASTING LICENSES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Apr. 28, 2017
Schedule of GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS [Line Items]
Gross goodwill	$ 377,989
Additions	0
Impairments	(2,712)
Accumulated impairment losses	(115,095)
Net goodwill at March 31, 2018	260,182	$ 262,894	$ 4,600
Radio Broadcasting Segment [Member]
Schedule of GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS [Line Items]
Gross goodwill	154,910
Additions	0
Impairments	(2,712)
Accumulated impairment losses	(84,436)
Net goodwill at March 31, 2018	67,762
Reach Media Segment [Member]
Schedule of GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS [Line Items]
Gross goodwill	30,468
Additions	0
Impairments	0
Accumulated impairment losses	(16,114)
Net goodwill at March 31, 2018	14,354
Digital Segment [Member]
Schedule of GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS [Line Items]
Gross goodwill	27,567
Additions	0
Impairments	0
Accumulated impairment losses	(14,545)
Net goodwill at March 31, 2018	13,022
Cable Television Segment [Member]
Schedule of GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS [Line Items]
Gross goodwill	165,044
Additions	0
Impairments	0
Accumulated impairment losses	0
Net goodwill at March 31, 2018	$ 165,044