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FAIR VALUE DISCLOSURES - Acquired (Details) $ in Thousands	1 Months Ended							3 Months Ended		12 Months Ended
FAIR VALUE DISCLOSURES - Acquired (Details) $ in Thousands	Jul. 31, 2020 USD ($)	May 31, 2020 USD ($) product	Jan. 31, 2020 USD ($) product	Jun. 30, 2019 USD ($) item	Mar. 31, 2019 USD ($) item	Jan. 31, 2019 USD ($)	Apr. 30, 2018 USD ($) product	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Payments to acquire intangible assets										$ 62,187	$ 20,914	$ 5,169
Gross carrying amount								$ 355,170	$ 307,225	$ 355,170	307,225
Useful life of intangible assets										9 years 4 months 24 days
Research and development										$ 16,001	19,806	15,388
Intangible asset impairment charge										446	75	0
Amortization of intangible assets										39,900	40,200	31,700
Inventories, net								60,803	48,163	60,803	48,163
Raw materials								41,591	34,881	41,591	34,881
Finished goods								20,363	16,750	20,363	16,750
Acquired in-process research and development ("IPR&D")										3,753	2,324	$ 1,335
Acquired ANDA intangible assets
Gross carrying amount								106,415	64,704	$ 106,415	64,704
Useful life of intangible assets										8 years 9 months 18 days
Marketing and distribution rights
Gross carrying amount								17,157	10,923	$ 17,157	10,923
Useful life of intangible assets										5 years 8 months 12 days
Intangible asset impairment charge										$ 400
Private Company [Member]
Number of generic products \| product		1
Total asset purchase	$ 4,300	$ 200
Transaction costs	100
Gross carrying amount	$ 3,000
Useful life of intangible assets	7 years	7 years
Intangible asset impairment charge										0
Inventories, net	$ 1,400
Amerigen Pharmaceuticals, Ltd.
Number of generic products \| product			23
Total asset purchase			$ 56,800
Transaction costs			700
Contingent liability not recognized			$ 25,000
Period of contingent payments			4 years
Number of commercial products under product portfolio			10
Number of approved products with launches pending under product portfolio			3
Number of filed products under product portfolio			4
Number of in-development products under product portfolio			4
Number of approved products under product portfolio			2
Useful life of intangible assets			7 years
Research and development			$ 3,800
Intangible asset impairment charge										0
Inventories, net			8,400
Raw materials			1,700
Finished goods			6,700
Amerigen Pharmaceuticals, Ltd. \| Revolver [Member]
Amount borrowed			$ 15,000
Amerigen Pharmaceuticals, Ltd. \| Discount rate
Fair values inputs discount rate			8.00%
Amerigen Pharmaceuticals, Ltd. \| Acquired ANDA intangible assets
Gross carrying amount			$ 38,500
Amerigen Pharmaceuticals, Ltd. \| Marketing and distribution rights
Gross carrying amount			$ 6,700
Coeptis Pharmaceuticals, Inc. [Member]
Number of generic products \| item				7
Total asset purchase				$ 2,300
Transaction costs				24
Contingent liability not recognized				$ 12,000
Pharmaceutics International, Inc and BAS ANDA LLC [Member]
Payments to acquire intangible assets									$ 500
Useful life of intangible assets									10 years
Intangible asset impairment charge								$ 400
Teva Pharmaceuticals [Member]
Number of generic products \| item					35
Payments to acquire intangible assets					$ 2,500	$ 16,000
Gross carrying amount					$ 2,500	9,200
Useful life of intangible assets					10 years
Intangible asset impairment charge										0	0
Cumulative amortization expense						$ 6,800
Teva Pharmaceuticals [Member] \| Discount rate
Fair values inputs discount rate					15.00%	12.00%
Impax Laboratories, Inc. [Member]
Number of generic products \| product							2
Transaction costs							$ 100
Payments to acquire intangible assets							2,300
Gross carrying amount							$ 1,000
Useful life of intangible assets							10 years
Intangible asset impairment charge										$ 0
Purchase commitment period							17 months
Equipment fair value							$ 58
Property useful life							5 years
Acquired in-process research and development ("IPR&D")							$ 1,300
Impax Laboratories, Inc. [Member] \| Discount rate
Fair values inputs discount rate							75.00%
Impax Laboratories, Inc. [Member] \| Discount rate \| Minimum
Fair values inputs discount rate							10.00%
Impax Laboratories, Inc. [Member] \| Discount rate \| Maximum
Fair values inputs discount rate							15.00%
Impax Laboratories, Inc. [Member] \| Milestone One [Member]
Contingent liability not recognized							$ 25,000
Impax Laboratories, Inc. [Member] \| Milestone Two [Member]
Contingent liability not recognized							15,000
Impax Laboratories, Inc. [Member] \| Milestone Three [Member]
Contingent liability not recognized							$ 10,000
Appco Pharma, LLC [Member]
Intangible asset impairment charge											$ 75