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INTANGIBLE ASSETS AND GOODWILL (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Changes in goodwill [Roll Forward] |  |  |
Goodwill before cumulative loss on impairment |  | $ 164,465 | $ 164,465
Accumulated loss on impairment |  | (125,615) | $ (125,615)
Beginning balance after cumulative loss on impairment | $ 38,850 | 38,850 |
Loss on impairment during the year | 0 | 0 |
Acquisition | 5,866 | 0 |
Deconsolidation of a subsidiary | (759) | 0 |
Assets held for sale | (10,230) | 0 |
Dispositions | 0 | 0 |
Ending balance | 33,727 | 38,850 |
Radio Broadcasting Licences [Member] |  |  |
Changes in broadcasting licenses [Line Items] |  |  |
Beginning of period balance | 718,992 | 718,542 |
Impairment loss | 0 | 0 |
Acquisition of radio stations | 79,209 | 0 |
Assets held for sale | (32,979) | 0 |
Deconsolidation of a subsidiary | (9,601) | 0 |
Acquisition - other | 100 | 450 |
Dispositions | 0 | 0 |
Ending period balance | $ 755,721 | $ 718,992 |

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