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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

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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- Definition Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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