GOODWILL AND INTANGIBLE ASSETS - Components (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 21, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Definite-Lived Intangible Assets:
Accumulated Amortization		$ (255,855)	$ (206,367)
Weighted Average Amortization Period		8 years 10 months 24 days
Indefinite-Lived Intangible Assets:
Gross Carrying Amount, total		$ 507,490	500,489
Intangible asset impairment charge		112	2,374	$ 446
Amortization of intangible assets		49,500	41,800	$ 39,900
Oakrum Pharma
Definite-Lived Intangible Assets:
Weighted Average Amortization Period	7 years
Indefinite-Lived Intangible Assets:
Intangible asset impairment charge		0
In process research and development
Indefinite-Lived Intangible Assets:
Gross Carrying Amount		26,575	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		(20,300)
Acquired ANDA intangible assets
Definite-Lived Intangible Assets:
Gross Carrying Amount		195,862	168,536
Accumulated Amortization		$ (75,606)	(54,079)
Weighted Average Amortization Period		8 years 3 months 18 days
Indefinite-Lived Intangible Assets:
Intangible asset impairment charge		$ 100	2,400
Acquired ANDA intangible assets | Oakrum Pharma
Definite-Lived Intangible Assets:
Gross Carrying Amount	$ 7,200
Indefinite-Lived Intangible Assets:
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:
Gross Carrying Amount		$ 20,300
Weighted Average Amortization Period		7 years
NDAs and product rights
Definite-Lived Intangible Assets:
Gross Carrying Amount		$ 242,372	242,372
Accumulated Amortization		$ (162,188)	(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
Accumulated Amortization		$ (13,309)	(12,347)
Weighted Average Amortization Period		5 years 6 months
Non-compete agreement
Definite-Lived Intangible Assets:
Gross Carrying Amount		$ 624	624
Accumulated Amortization		$ (602)	(513)
Weighted Average Amortization Period		7 years
Customer relationships
Definite-Lived Intangible Assets:
Gross Carrying Amount		$ 24,900	24,900
Accumulated Amortization		$ (4,150)	$ (593)
Weighted Average Amortization Period		7 years