REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 1,219,404	$ 1,060,898	$ 1,489,929
Spot revenues
Disaggregation of Revenue [Line Items]
Revenues	799,687	705,743	1,092,029
Digital revenues
Disaggregation of Revenue [Line Items]
Revenues	237,824	189,988	146,274
Network revenues
Disaggregation of Revenue [Line Items]
Revenues	84,089	80,346	75,629
Sponsorships and event revenues
Disaggregation of Revenue [Line Items]
Revenues	52,319	42,478	102,385
Other revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 45,485	$ 42,343	$ 73,612