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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended	2 Months Ended	3 Months Ended								4 Months Ended	8 Months Ended	12 Months Ended
	Oct. 22, 2020	May 01, 2019	Jun. 30, 2019	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	May 01, 2019	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Nonamortizable intangible assets		$ 2,195,984										$ 2,195,984
Impairment charges		0	$ 0		$ 5,517	$ 0	$ 5,378	$ 1,727,857	$ 0	$ 0	$ 91,382	91,382	$ 0	$ 1,738,752	$ 33,150
Amortization of intangible assets												12,700	$ 171,500	$ 258,900	110,900
Voxnest, Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount paid for acquisition	$ 50,000
Triton | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amount paid for acquisition				$ 230,000
Licensing Agreements
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Nonamortizable intangible assets		$ 2,281,720										2,281,720
Non-cash impairment charge								$ 502,700				$ 91,400
iHM
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill, accumulated impairment loss															3,500,000
Audio and Media Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill, accumulated impairment loss															$ 212,000

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