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LONG-TERM DEBT - Legacy Notes (Narrative) (Details) - iHeart Communications Legacy Note - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Principal amount held by a subsidiary   $ 57.1
Subsidiary of iHeartCommunications    
Debt Instrument [Line Items]    
Principal amount held by a subsidiary $ 57.1