FAIR VALUE OF FINANCIAL INSTRUMENTS - Non-Recurring basis (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | 12 Months Ended | |
|---|---|---|---|---|
Dec. 31, 2018 |
Jun. 30, 2018 |
Sep. 30, 2019 |
Dec. 31, 2018 |
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||
| Goodwill, Impairment Loss | $ 317,100 | $ 0 | $ 317,138 | |
| Impairment - Market Assets | $ 2,100 | |||
| Impairment - Assets Held for Sale | $ 26,900 | |||
| Goodwill, Impairment Loss, Net of Tax | 314,400 | |||
| Radio Broadcasting Licences [Member] | ||||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||
| Total Impairment of FCC Licenses | 147,900 | |||
| Total Impairment of FCC Licenses, net of tax | $ 108,800 | |||