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REVENUE - Schedule of Barter and Trade Revenue and Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation of Revenue [Line Items]        
Trade and barter revenues $ 927,747 $ 743,829 $ 2,495,188 $ 2,011,248
Trade and Barter Transactions        
Disaggregation of Revenue [Line Items]        
Trade and barter revenues 49,200 41,430 127,654 113,861
Trade and barter expenses $ 33,955 $ 44,109 $ 101,998 $ 116,182