GOODWILL AND INTANGIBLE ASSETS - Components (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 21, 2022	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Definite-Lived Intangible Assets:
Accumulated Amortization		$ (243,253)		$ (243,253)		$ (206,367)
Weighted Average Amortization Period				8 years 10 months 24 days
Indefinite-Lived Intangible Assets:
Gross Carrying Amount, total		507,490		$ 507,490		500,489
Amortization of intangible assets		12,500	$ 10,100	36,900	$ 29,800
Intangible asset impairment charge			$ 0	$ 112	$ 0
Minimum
Definite-Lived Intangible Assets:
Weighted Average Amortization Period				7 years
Maximum
Definite-Lived Intangible Assets:
Weighted Average Amortization Period				10 years
In process research and development
Indefinite-Lived Intangible Assets:
Gross Carrying Amount		33,350		$ 33,350		46,900
In process research and development | Reclassification of Assets on Completion of Project and Launch of Related Products
Definite-Lived Intangible Assets:
Gross Carrying Amount		(13,600)		(13,600)
Acquired ANDA intangible assets | Reclassification of Assets on Completion of Project and Launch of Related Products
Definite-Lived Intangible Assets:
Gross Carrying Amount		13,600		13,600
Acquired ANDA intangible assets
Definite-Lived Intangible Assets:
Gross Carrying Amount		189,087		189,087		168,536
Accumulated Amortization		(69,824)		$ (69,824)		(54,079)
Weighted Average Amortization Period				8 years 3 months 18 days
Acquired ANDA intangible assets | Oakrum Pharma
Definite-Lived Intangible Assets:
Gross Carrying Amount	$ 7,200
Weighted Average Amortization Period	7 years
Indefinite-Lived Intangible Assets:
Intangible asset impairment charge				$ 0
Intangible assets acquired		$ 7,200
Acquired ANDA intangible assets | Reclassification of Assets on Completion of Project and Launch of Related Products
Definite-Lived Intangible Assets:
Weighted Average Amortization Period		7 years
NDAs and product rights
Definite-Lived Intangible Assets:
Gross Carrying Amount		$ 242,372		242,372		242,372
Accumulated Amortization		(156,520)		$ (156,520)		(138,835)
Weighted Average Amortization Period				9 years 10 months 24 days
Marketing and distribution rights
Definite-Lived Intangible Assets:
Gross Carrying Amount		17,157		$ 17,157		17,157
Accumulated Amortization		(13,069)		$ (13,069)		(12,347)
Weighted Average Amortization Period				5 years 6 months
Non-compete agreement
Definite-Lived Intangible Assets:
Gross Carrying Amount		624		$ 624		624
Accumulated Amortization		(579)		$ (579)		(513)
Weighted Average Amortization Period				7 years
Customer relationships
Definite-Lived Intangible Assets:
Gross Carrying Amount		24,900		$ 24,900		24,900
Accumulated Amortization		$ (3,261)		$ (3,261)		$ (593)
Weighted Average Amortization Period				7 years