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BASIS OF PRESENTATION - Schedule of Trade and Barter Revenues and Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Trade and barter revenues $ 40,318 $ 52,023 $ 97,710 $ 112,444
Trade and barter expenses 34,398 35,836 102,671 91,830
iHM        
Segment Reporting Information [Line Items]        
Trade and barter revenues 35,992 47,184 89,938 103,280
Trade and barter expenses $ 31,690 $ 33,859 $ 96,220 $ 86,356