GOODWILL AND INTANGIBLE ASSETS - Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Definite-Lived Intangible Assets:
Accumulated Amortization	$ (218,916)		$ (206,367)
Weighted Average Amortization Period	9 years
Indefinite-Lived Intangible Assets:
Gross Carrying Amount, total	$ 500,489		500,489
Amortization of intangible assets	12,500	$ 9,700
Intangible asset impairment charge	$ 0	$ 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
Acquired ANDA intangible assets
Definite-Lived Intangible Assets:
Gross Carrying Amount	168,536		168,536
Accumulated Amortization	$ (59,127)		(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
Accumulated Amortization	$ (145,184)		(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	$ (12,588)		(12,347)
Weighted Average Amortization Period	5 years 6 months
Non-compete agreement
Definite-Lived Intangible Assets:
Gross Carrying Amount	$ 624		624
Accumulated Amortization	$ (535)		(513)
Weighted Average Amortization Period	7 years
Customer relationships
Definite-Lived Intangible Assets:
Gross Carrying Amount	$ 24,900		24,900
Accumulated Amortization	$ (1,482)		$ (593)
Weighted Average Amortization Period	7 years