GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS - Changes in Radio Broadcasting Licenses (Details) - USD ($) $ in Thousands			3 Months Ended						12 Months Ended
	Oct. 01, 2023	Oct. 01, 2022	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Beginning balance						$ 39,690			$ 39,690
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]									Asset Impairment Charges	Asset Impairment Charges
Ending balance			$ 39,690						$ 39,690	$ 39,690
Radio broadcasting licenses
Schedule of Goodwill, Radio Broadcasting Licenses And Other Intangible Assets [Line Items]
Beginning balance						488,419			488,419	501,420
Acquisitions									23,431	23,642
Disposals									(7,276)	(3,200)
Impairment charges	$ 0	$ (7,400)	(5,000)	$ (85,400)	$ (22,100)	$ (16,800)	$ (15,500)	$ (10,600)	(129,278)	(33,443)
Ending balance			$ 375,296						$ 375,296	$ 488,419