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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