ACQUISITIONS AND DISPOSITIONS OF ASSETS - Fair Value of Acquired Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Sep. 01, 2017	Dec. 31, 2016	Mar. 31, 2016
Acquisitions
Goodwill	$ 2,123,902	$ 2,124,033		$ 1,990,746
Bonten
Acquisitions
Accounts receivable			$ 14,536
Prepaid expenses and other current assets			699
Program contract costs			988
Property and equipment			27,295
Definite-lived intangible assets			161,936
Indefinite-lived intangible assets			425
Other assets			3,609
Accounts payable and accrued liabilities			(8,846)
Program contracts payable			(988)
Deferred tax liability			(66,158)
Other long term liabilities			(12,265)
Fair value of identifiable net assets acquired			121,231
Goodwill			120,921
Total			$ 242,152
Tennis Channel
Acquisitions
Accounts receivable					$ 17,629
Prepaid expenses and other current assets					6,518
Property and equipment					5,964
Definite-lived intangible assets					272,686
Indefinite-lived intangible assets					23,400
Other assets					619
Accounts payable and accrued liabilities					(7,414)
Capital leases					(115)
Deferred tax liability					(16,991)
Other long term liabilities					(1,669)
Fair value of identifiable net assets acquired					300,627
Goodwill					53,427
Total					$ 354,054