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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 2,313,223,000 | $ 2,313,223,000 |  | $ 2,145,935,000 | $ 3,325,622,000
Total amortization expense related to definite-lived intangible assets |  | 66,300,000 | $ 64,300,000 |  |
Impairment of intangibles |  |  | 0 |  |
Goodwill impairment |  | 0 | 1,200,000,000 | $ 1,224,374,000 |
Triton Digital |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Consideration transferred for acquisition | 228,400,000 |  |  |  |
Assets acquired | 69,700,000 | 69,700,000 |  |  |
Intangible assets acquired | 190,700,000 | 190,700,000 |  |  |
Goodwill | 167,400,000 | 167,400,000 |  |  |
Tax-deductible goodwill | 6,900,000 | 6,900,000 |  |  |
Liabilities assumed | $ 32,000,000.0 | $ 32,000,000.0 |  |  |
FCC Licenses |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Impairment of FCC licenses |  |  | $ 502,700,000 |  |

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