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REVENUE - Schedule of Barter and Trade Revenue and Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Trade and barter revenues $ 861,260 $ 487,249 $ 1,567,441 $ 1,267,418
Trade and Barter Transactions        
Disaggregation of Revenue [Line Items]        
Trade and barter revenues 46,508 19,753 78,454 72,431
Trade and barter expenses $ 40,045 $ 17,075 $ 68,043 $ 72,073