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BASIS OF PRESENTATION - Schedule of Trade and Barter Revenues and Expenses (Details) - Trade and Barter Transactions - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Trade and barter revenues $ 55,475 $ 49,886 $ 153,185 $ 162,330
Trade and barter expenses 42,985 34,672 145,656 126,502
iHM        
Segment Reporting Information [Line Items]        
Trade and barter revenues 51,831 45,884 141,769 149,164
Trade and barter expenses $ 40,607 $ 31,859 $ 136,827 $ 118,215