v3.8.0.1

SUPPLEMENTAL CASH FLOW DISCLOSURES ON NON-CASH INVESTING AND FINANCING ACTIVITIES (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash Flow Noncash [Line Items] |  |  |
Net Paid In Captital Of Rsus | $ 34,511 | $ 10,101 | $ 8,336
Transition Services Costs incurred in Merger | 1,917 | 0 | 0
Reduction in Transition Services Costs | (1,917) | 0 | 0
Perpetual Cumulative Convertible Preferred Stock Issued For Acquisition | 0 | 0 | 27,500
Dividend Accrued On Perpetual Cumulative Convertible Preferred Stock | 0 | 452 | 339
Finance Method Lease Obligations Retirement | 0 | 0 | 0
Net Radio Station Assets Given Up | 124,500 | 0 | 59,000
Net Radio Station Assets Acquired | 124,500 | 0 | 59,000
Radio Station Assets Acquired Using Preferred Stock | 0 | 0 | 27,500
Cash acquired through consolidation of a VIE | (302) | 302 | 0
Radio station assets acquired through the issuance of common stock | 1,168,848 | 0 | 0
Barter And Other Transactions [Abstract] |  |  |
Barter Revenues | 10,898 | 4,700 | 4,002
Barter expenses | 9,440 | 4,789 | 4,258
Issuance [Member] |  |  |
Cash Flow Noncash [Line Items] |  |  |
Net Paid In Captital Of Rsus | 35,628 | 10,381 | 9,045
Forfeited [Member] |  |  |
Cash Flow Noncash [Line Items] |  |  |
Net Paid In Captital Of Rsus | $ 1,117 | $ 280 | $ 709

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