Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

GOODWILL AND RADIO BROADCASTING LICENSES - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019
GOODWILL AND RADIO BROADCASTING LICENSES
Goodwill, Impairment Loss		$ 15,900
Radio Broadcasting Licenses [Member]
GOODWILL AND RADIO BROADCASTING LICENSES
Impairment charge	$ 47,700	19,100	$ 3,800
Radio Market Reporting Units [Member]
GOODWILL AND RADIO BROADCASTING LICENSES
Impairment charge	6,000	$ 10,000
Goodwill, Impairment Loss	$ 6,000