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REVENUE - Schedule of Barter and Trade Revenue and Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disaggregation of Revenue [Line Items]    
Trade and barter revenues $ 780,170 $ 795,387
Trade and Barter Transactions    
Disaggregation of Revenue [Line Items]    
Trade and barter revenues 52,678 55,585
Trade and barter expenses 54,998 49,856
Advertising Trade and Barter Transactions    
Disaggregation of Revenue [Line Items]    
Trade and barter revenues $ 5,000 $ 5,100