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REVENUE - Schedule of Barter and Trade Revenue and Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]    
Trade and barter revenues $ 706,182 $ 780,170
Trade and Barter Transactions    
Disaggregation of Revenue [Line Items]    
Trade and barter revenues 31,946 52,678
Trade and barter expenses $ 27,998 $ 54,998