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REVENUE - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
May 01, 2019
Sep. 30, 2019
Sep. 30, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Trade and barter revenues $ 743,829 $ 947,920 $ 1,072,775 $ 1,583,287 $ 2,011,248
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Revenue, remaining performance obligation $ 262,300       $ 262,300
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 $ 5,600 $ 5,900 $ 7,500 $ 7,500