REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 414,118	$ 386,141	$ 380,665	$ 309,005	$ 411,375	$ 378,508	$ 372,124	$ 300,560	$ 1,489,929	$ 1,462,567	$ 592,884
Broadcast revenues
Disaggregation of Revenue [Line Items]
Revenues									1,360,092	1,327,803	530,553
Event and other revenues
Disaggregation of Revenue [Line Items]
Revenues									112,924	115,399	51,434
Trade and barter revenues
Disaggregation of Revenue [Line Items]
Revenues									$ 16,913	$ 19,365	$ 10,897