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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, 2018
May 01, 2019
Jun. 30, 2018
Indefinite-lived Intangible Assets [Line Items]          
Indefinite-lived intangibles - licenses $ 2,195,984     $ 2,195,984  
Impairment charges   $ 0   91,382 $ 0
Total amortization expense related to definite-lived intangible assets 3,000 $ 42,500 $ 40,100 12,700 $ 81,900
Licenses          
Indefinite-lived Intangible Assets [Line Items]          
Indefinite-lived intangibles - licenses $ 2,281,720     $ 2,281,720