GOODWILL, INDEFINITE-LIVED INTANGIBLE ASSETS AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amortized intangible assets:
Goodwill	$ 2,124,033,000	$ 1,990,746,000	$ 1,931,093,000
Accumulated goodwill impairment	413,573,000	413,600,000
Goodwill impairment	$ 0	0	0
Amortization period, weighted average useful life	14 years
Amortization of definite-lived intangible assets and other assets	$ 178,822,000	183,795,000	$ 161,454,000
Minimum
Amortized intangible assets:
Amortization period	5 years
Maximum
Amortized intangible assets:
Amortization period	25 years
Broadcast licenses
Amortized intangible assets:
Impairment charge	$ 0	$ 0