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	8 Months Ended	12 Months Ended
	May 01, 2019	Jun. 30, 2019	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	May 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	May 02, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Nonamortizable intangible assets	$ 2,195,984									$ 2,195,984
Impairment charges	0	$ 0	$ 0	$ 0	$ 91,382	$ 0	$ 33,150	$ 0	$ 0	91,382	$ 0	$ 33,150	$ 6,040
Intangible assets acquired													6,000
Amortization of intangible assets										12,700	171,500	110,900	169,300
Goodwill	3,415,492		$ 3,325,622			$ 3,412,753				3,415,492	$ 3,325,622	$ 3,412,753	3,337,039	$ 3,323,365
Licensing Agreements
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Nonamortizable intangible assets	$ 2,281,720									$ 2,281,720
iHM
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment loss													3,500,000
Corporate and Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Impairment loss													$ 212,000