INTANGIBLE ASSETS AND GOODWILL - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 272,010	$ 1,098,588
Accumulated Amortization	(71,928)	(508,263)
Impairment		(189,790)
Total	$ 200,082	400,535
Product rights | INDOCIN Products
Finite-Lived Intangible Assets [Line Items]
Remaining Useful Life (In years)	11 years 4 months 24 days
Gross Carrying Amount	$ 154,100	0
Accumulated Amortization	(7,812)	0
Total	$ 146,288	0
Product rights | SPRIX
Finite-Lived Intangible Assets [Line Items]
Remaining Useful Life (In years)	6 years 4 months 24 days
Gross Carrying Amount	$ 39,000	0
Accumulated Amortization	(3,389)	0
Total	$ 35,611	0
Product rights | CAMBIA
Finite-Lived Intangible Assets [Line Items]
Remaining Useful Life (In years)	3 years
Gross Carrying Amount	$ 51,360	51,360
Accumulated Amortization	(36,163)	(31,027)
Total	$ 15,197	20,333
Product rights | Zipsor
Finite-Lived Intangible Assets [Line Items]
Remaining Useful Life (In years)	1 year 2 months 12 days
Gross Carrying Amount	$ 27,250	27,250
Accumulated Amortization	(24,381)	(22,044)
Total	$ 2,869	5,206
Product rights | OXAYDO
Finite-Lived Intangible Assets [Line Items]
Remaining Useful Life (In years)	4 months 24 days
Gross Carrying Amount	$ 300	0
Accumulated Amortization	(183)	0
Total	117	0
Product rights | NUCYNTA
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	0	1,019,978
Accumulated Amortization	0	(455,192)
Impairment		(189,790)
Total	$ 0	$ 374,996	$ 564,800