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REVENUE - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
May 01, 2019
Jun. 30, 2019
Jun. 30, 2020
May 01, 2019
Jun. 30, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Trade and barter revenues $ 277,388 $ 635,367 $ 487,249 $ 1,072,775 $ 1,267,418
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, remaining performance obligation     $ 226,600   $ 226,600
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 $ 900 $ 1,900 $ 200 $ 5,900 $ 5,200