REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net revenues	$ 240,764	$ 297,030
Revenue expected to be recognized	1,100
Spot revenues
Disaggregation of Revenue [Line Items]
Net revenues	154,294	203,414
Digital revenues
Disaggregation of Revenue [Line Items]
Net revenues	49,840	42,510
Network revenues
Disaggregation of Revenue [Line Items]
Net revenues	17,570	21,295
Sponsorships and event revenues
Disaggregation of Revenue [Line Items]
Net revenues	9,158	16,856
Other revenues
Disaggregation of Revenue [Line Items]
Net revenues	$ 9,902	$ 12,955