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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 4 Months Ended | 5 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 22, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | May 01, 2019 | Sep. 30, 2019 | Sep. 30, 2020
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Total amortization expense related to definite-lived intangible assets |  | $ 64,500 |  | $ 67,000 | $ 12,700 | $ 109,500 | $ 193,000
Goodwill impairment |  |  | $ 1,200,000 |  |  |  | $ 1,224,374
Voxnest | Subsequent Event |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Consideration transferred for acquisition | $ 50,000 |  |  |  |  |  |
FCC Licenses |  |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Impairment of FCC licenses |  |  | $ 502,700 |  | $ 91,400 |  |

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