GOODWILL AND OTHER INTANGIBLES - Accumulated Impairment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Goodwill [Line Items]
Accumulated impairment losses	$ 4,546,944	$ 4,544,718
Branded Pharmaceuticals
Goodwill [Line Items]
Accumulated impairment losses	855,810	855,810
Sterile Injectables
Goodwill [Line Items]
Accumulated impairment losses	0	0
Generic Pharmaceuticals
Goodwill [Line Items]
Accumulated impairment losses	3,142,657	3,142,657
International Pharmaceuticals
Goodwill [Line Items]
Accumulated impairment losses	$ 548,477	$ 546,251