GOODWILL AND INTANGIBLE ASSETS - Narrative (Details)		12 Months Ended
	Sep. 16, 2024 USD ($)	Dec. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2013 USD ($)
Goodwill [Line Items]
Number of operating segments | segment		2
Number of reporting units | segment		3
Goodwill		$ 59,990,000	$ 28,221,000
Goodwill, impairment loss		0	0	$ 0
Intangible assets acquired			9,600,000
Intangible asset impairment charge		3,600,000	0	100,000
Amortization of intangible assets		60,300,000	52,300,000	49,500,000
Impairment of intangible assets, indefinite-lived		4,000,000.0	0	$ 0
Increase (decrease) in definite-lived intangible assets			16,400,000
Finite-lived intangible gross carrying amount		$ 893,825,000	496,708,000
Maximum
Goodwill [Line Items]
Remaining estimated useful lives		12 years
Acquired ANDA intangible assets
Goodwill [Line Items]
Finite-lived intangible gross carrying amount		$ 210,497,000	209,780,000
Acquired ANDA intangible assets | Slayback Pharma Limited Liability Company and Akorn Holding Company
Goodwill [Line Items]
Intangible assets acquired			7,100,000
Acquired ANDA intangible assets | Reclassification of Assets on Completion of Project and Launch of Related Products | In process research and development
Goodwill [Line Items]
Finite-lived intangible gross carrying amount			6,800,000
Product Rights | Alvogen Inc
Goodwill [Line Items]
Intangible assets acquired			$ 2,000,000.0
BioSante Pharmaceuticals
Goodwill [Line Items]
Acquisition of goodwill							$ 1,800,000
WellSpring
Goodwill [Line Items]
Acquisition of goodwill						$ 1,700,000
Novitium
Goodwill [Line Items]
Acquisition of goodwill					$ 24,600,000
Alimera Sciences, Inc
Goodwill [Line Items]
Goodwill	$ 32,202,000	31,765,000
Alimera Sciences, Inc | YUTIQ
Goodwill [Line Items]
Intangible assets acquired	$ 170,000	170,000,000.0
Remaining estimated useful lives	12 years
Alimera Sciences, Inc | ILUVIEN
Goodwill [Line Items]
Intangible assets acquired	$ 230,000	$ 230,000,000.0
Remaining estimated useful lives	12 years