GOODWILL, INDEFINITE-LIVED INTANGIBLE ASSETS AND OTHER INTANGIBLE ASSETS - Broadcast Licenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Carrying amount of our broadcast licenses
Beginning balance	$ 159,371	$ 156,306
Acquisitions		4,476
Disposition of assets	(1,149)	(1,411)
Ending balance	158,222	159,371
Consolidated VIEs
Carrying amount of our broadcast licenses
Ending balance	14,300
Broadcast
Carrying amount of our broadcast licenses
Beginning balance	131,920	132,906
Acquisitions		425
Disposition of assets	(1,149)	(1,411)
Ending balance	130,771	131,920
Other
Carrying amount of our broadcast licenses
Beginning balance	27,451	23,400
Acquisitions		4,051
Disposition of assets	0	0
Ending balance	$ 27,451	$ 27,451