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