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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Schedule Of Changes In Carrying Amount Of Goodwill (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Goodwill
Beginning balance	$ 2,145,935,000	$ 3,325,622,000	$ 3,325,622,000
Impairment	0	(1,200,000,000)	(1,224,374,000)
Acquisitions	167,406,000		44,606,000
Dispositions			(164,000)
Foreign currency	(118,000)		245,000
Ending balance	2,313,223,000		2,145,935,000
Audio
Goodwill
Beginning balance	2,041,536,000	3,221,468,000	3,221,468,000
Impairment			(1,224,374,000)
Acquisitions			44,606,000
Dispositions			(164,000)
Foreign currency			0
Ending balance			2,041,536,000
Audio and Media Services
Goodwill
Beginning balance	104,399,000	$ 104,154,000	104,154,000
Impairment			0
Acquisitions	0		0
Dispositions			0
Foreign currency	(118,000)		245,000
Ending balance	104,281,000		104,399,000
Multiplatform Group
Goodwill
Beginning balance	1,462,217,000
Acquisitions	0
Foreign currency	0
Ending balance	1,462,217,000		1,462,217,000
Digital Audio Group
Goodwill
Beginning balance	579,319,000
Acquisitions	167,406,000
Foreign currency	0
Ending balance	$ 746,725,000		$ 579,319,000

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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