GOODWILL AND OTHER INTANGIBLE ASSETS - Radio Broadcasting Licenses (Details) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
GOODWILL AND RADIO BROADCASTING LICENSES
Impairment charge							$ 20,200
Radio broadcasting licenses
GOODWILL AND RADIO BROADCASTING LICENSES
Impairment charge	$ 37,700	$ 80,800	$ 5,000	$ 85,400	$ 22,100	$ 16,800	$ 118,492	$ 129,278
Discount rate	10.50%	10.00%		10.00%	9.50%
Terminal growth rate range	(0.50%)	(0.50%)	(0.50%)	(0.50%)				(0.50%)
Minimum | Radio broadcasting licenses
GOODWILL AND RADIO BROADCASTING LICENSES
Discount rate			9.50%					9.50%
Revenue growth rate range	(4.00%)	(3.20%)	(2.30%)	(1.70%)	0.30%			(2.30%)
Terminal growth rate range					0.30%
Mature market share range	1.10%	1.00%	5.20%	5.30%	0.90%			5.20%
Operating profit range	1.30%	2.50%	17.00%	17.00%	18.80%			17.00%
Maximum | Radio broadcasting licenses
GOODWILL AND RADIO BROADCASTING LICENSES
Discount rate			10.00%					10.00%
Revenue growth rate range	0.30%	0.20%	0.80%	0.00%	1.40%			0.80%
Terminal growth rate range					0.80%
Mature market share range	30.50%	28.50%	30.00%	29.50%	28.80%			30.00%
Operating profit range	30.00%	30.00%	31.90%	33.50%	34.60%			31.90%