GOODWILL AND INTANGIBLE ASSETS - Components (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Definite-Lived Intangible Assets:
Gross Carrying Amount	$ 485,244,000		$ 485,244,000		$ 480,915,000
Accumulated Amortization	$ (281,520,000)		$ (281,520,000)		(255,855,000)
Remaining Weighted Average Amortization Period	4 years 8 months 12 days		4 years 8 months 12 days
Indefinite-Lived Intangible Assets:
Total Intangible Assets, Gross	$ 511,819,000		$ 511,819,000		507,490,000
Amortization of intangible assets	12,800,000	$ 11,900,000	25,700,000	$ 24,400,000
Intangible asset impairment charge	$ 0	$ 112,000	$ 0	$ 112,000
Minimum
Indefinite-Lived Intangible Assets:
Remaining estimated useful lives	7 years		7 years
Maximum
Indefinite-Lived Intangible Assets:
Remaining estimated useful lives	10 years		10 years
In process research and development
Indefinite-Lived Intangible Assets:
Gross Carrying Amount	$ 26,575,000		$ 26,575,000		26,575,000
Acquired ANDAs intangible assets
Definite-Lived Intangible Assets:
Gross Carrying Amount	200,191,000		200,191,000		195,862,000
Accumulated Amortization	$ (87,653,000)		$ (87,653,000)		(75,606,000)
Remaining Weighted Average Amortization Period	5 years 6 months		5 years 6 months
NDAs and product rights
Definite-Lived Intangible Assets:
Gross Carrying Amount	$ 242,372,000		$ 242,372,000		242,372,000
Accumulated Amortization	$ (173,524,000)		$ (173,524,000)		(162,188,000)
Remaining Weighted Average Amortization Period	3 years 4 months 24 days		3 years 4 months 24 days
Marketing and distribution rights
Definite-Lived Intangible Assets:
Gross Carrying Amount	$ 17,157,000		$ 17,157,000		17,157,000
Accumulated Amortization	$ (13,790,000)		$ (13,790,000)		(13,309,000)
Remaining Weighted Average Amortization Period	3 years 6 months		3 years 6 months
Non-compete agreement
Definite-Lived Intangible Assets:
Gross Carrying Amount	$ 624,000		$ 624,000		624,000
Accumulated Amortization	(624,000)		(624,000)		(602,000)
Customer relationships
Definite-Lived Intangible Assets:
Gross Carrying Amount	24,900,000		24,900,000		24,900,000
Accumulated Amortization	$ (5,929,000)		$ (5,929,000)		$ (4,150,000)
Remaining Weighted Average Amortization Period	5 years 3 months 18 days		5 years 3 months 18 days