GOODWILL, INDEFINITE-LIVED INTANGIBLE ASSETS AND OTHER INTANGIBLE ASSETS - Broadcast Licenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Carrying amount of our broadcast licenses
Beginning balance	$ 156,306	$ 132,465
Acquisitions	4,476	25,806
Disposition of assets	(1,411)	(1,965)
Ending balance	159,371	156,306
Consolidated VIEs
Carrying amount of our broadcast licenses
Beginning balance	15,700
Ending balance	14,300	15,700
Broadcast
Carrying amount of our broadcast licenses
Beginning balance	132,906	132,465
Acquisitions	425	2,406
Disposition of assets	(1,411)	(1,965)
Ending balance	131,920	132,906
Other
Carrying amount of our broadcast licenses
Beginning balance	23,400	0
Acquisitions	4,051	23,400
Disposition of assets	0	0
Ending balance	$ 27,451	$ 23,400