GOODWILL AND INTANGIBLE ASSETS - Components (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Definite-Lived Intangible Assets:
Accumulated Amortization	$ (230,737)		$ (230,737)		$ (206,367)
Weighted Average Amortization Period			9 years
Indefinite-Lived Intangible Assets:
Gross Carrying Amount, total	500,330		$ 500,330		500,489
Amortization of intangible assets	11,900	$ 10,100	24,400	$ 19,700
Intangible asset impairment charge	112	$ 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	46,900		$ 46,900		46,900
Acquired ANDA intangible assets
Definite-Lived Intangible Assets:
Gross Carrying Amount	168,377		168,377		168,536
Accumulated Amortization	(64,128)		$ (64,128)		(54,079)
Weighted Average Amortization Period			8 years 6 months
NDAs and product rights
Definite-Lived Intangible Assets:
Gross Carrying Amount	242,372		$ 242,372		242,372
Accumulated Amortization	(150,853)		$ (150,853)		(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	(12,828)		$ (12,828)		(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	(557)		$ (557)		(513)
Weighted Average Amortization Period			7 years
Customer relationships
Definite-Lived Intangible Assets:
Gross Carrying Amount	24,900		$ 24,900		24,900
Accumulated Amortization	$ (2,371)		$ (2,371)		$ (593)
Weighted Average Amortization Period			7 years