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REVENUE - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Trade and barter revenues $ 861,260 $ 487,249 $ 1,567,441 $ 1,267,418
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Revenue, remaining performance obligation $ 239,200   $ 239,200  
Revenue, remaining performance obligation, period 5 years   5 years  
Advertising Trade and Barter Transactions        
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]        
Trade and barter revenues $ 2,300 $ 200 $ 4,500 $ 5,200