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
	Sep. 30, 2019	Sep. 30, 2018	May 01, 2019	Sep. 30, 2019	Sep. 30, 2018	May 02, 2019	Dec. 31, 2018	Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangibles - licenses			$ 2,195,984
Impairment charges	$ 0	$ 33,150	91,382	$ 0	$ 33,150
Total amortization expense related to definite-lived intangible assets	67,000	$ 19,200	12,700	109,500	$ 101,100
Goodwill	$ 3,325,546		3,415,492	$ 3,325,546		$ 3,323,365	$ 3,412,753	$ 3,337,039
Licenses
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangibles - licenses			$ 2,281,720