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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
May 01, 2019
Jun. 30, 2019
Jun. 30, 2020
Mar. 31, 2020
May 01, 2019
Jun. 30, 2020
Jun. 30, 2019
Indefinite-lived Intangible Assets [Line Items]              
Total amortization expense related to definite-lived intangible assets $ 3,000 $ 42,500 $ 64,300   $ 12,700 $ 128,600  
Goodwill impairment       $ 1,200,000   $ 1,224,374  
FCC Licenses              
Indefinite-lived Intangible Assets [Line Items]              
Impairment of FCC licenses       $ 502,700     $ 91,400