INTANGIBLE ASSETS AND GOODWILL - Broadcasting Licenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Broadcasting licenses balance as of January 1,	$ 2,508,121	$ 2,516,625
Disposition of radio stations (see Note 3, 22)	(432)	(17,940)
Acquisitions (see Note 3)	0	19,576
Loss on impairment (See Note 14)	(261,929)	0
Assets held for sale (see Note 22)	(16,744)	(10,140)
Ending period balance	$ 2,229,016	$ 2,508,121