GOODWILL AND INTANGIBLE ASSETS - Components (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Definite-Lived Intangible Assets:
Gross Carrying Amount	$ 496,708,000		$ 496,708,000
Accumulated Amortization	(320,464,000)		(307,499,000)
Net Carrying Amount	$ 176,244,000		189,209,000
Remaining Weighted Average Amortization Period	4 years 3 months 18 days
Indefinite-Lived Intangible Assets:
Total Intangible Assets, Gross	$ 516,508,000		516,508,000
Total Intangible Assets, Net	196,044,000		209,009,000
Amortization of intangible assets	13,000,000	$ 12,800,000
Impairment	0	0
Impairment of indefinite lived intangible assets	$ 0	$ 0
Minimum
Indefinite-Lived Intangible Assets:
Remaining estimated useful lives	7 years
Maximum
Indefinite-Lived Intangible Assets:
Remaining estimated useful lives	10 years
In process research and development
Indefinite-Lived Intangible Assets:
Gross Carrying Amount	$ 19,800,000		19,800,000
Acquired ANDAs intangible assets
Definite-Lived Intangible Assets:
Gross Carrying Amount	209,780,000		209,780,000
Accumulated Amortization	(106,701,000)		(100,660,000)
Net Carrying Amount	$ 103,079,000		109,120,000
Remaining Weighted Average Amortization Period	5 years
NDAs and product rights
Definite-Lived Intangible Assets:
Gross Carrying Amount	$ 244,871,000		244,871,000
Accumulated Amortization	(190,656,000)		(184,861,000)
Net Carrying Amount	$ 54,215,000		60,010,000
Remaining Weighted Average Amortization Period	3 years
Marketing and distribution rights
Definite-Lived Intangible Assets:
Gross Carrying Amount	$ 17,157,000		17,157,000
Accumulated Amortization	(14,512,000)		(14,271,000)
Net Carrying Amount	$ 2,645,000		2,886,000
Remaining Weighted Average Amortization Period	2 years 9 months 18 days
Customer relationships
Definite-Lived Intangible Assets:
Gross Carrying Amount	$ 24,900,000		24,900,000
Accumulated Amortization	(8,595,000)		(7,707,000)
Net Carrying Amount	$ 16,305,000		$ 17,193,000
Remaining Weighted Average Amortization Period	4 years 7 months 6 days