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LONG-TERM DEBT - Legacy Notes (Narrative) (Details) - iHeart Communications Legacy Note - USD ($) $ in Millions | 12 Months Ended
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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 |

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