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REVENUE - Schedule of Barter and Trade Revenue and Expenses (Details) - USD ($)
$ in Thousands
4 Months Ended 8 Months Ended 12 Months Ended
May 01, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2018
Disaggregation of Revenue [Line Items]        
Trade and barter revenues $ 1,072,775 $ 2,608,862 $ 2,946,124 $ 3,608,529
Trade and Barter Transactions        
Disaggregation of Revenue [Line Items]        
Trade and barter revenues 65,934 151,497 158,383 202,674
Trade and barter expenses 58,330 134,865 154,715 199,982
Advertising Trade and Barter Transactions        
Disaggregation of Revenue [Line Items]        
Trade and barter revenues $ 5,900 $ 13,000 $ 10,500 $ 10,900