INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	1 Months Ended				12 Months Ended
	Aug. 31, 2015	Jul. 31, 2015	Mar. 31, 2015	Dec. 26, 2013	Dec. 31, 2017	Dec. 31, 2016
GOODWILL AND INTANGIBLE ASSETS
Gross Carrying Amount					$ 284,716	$ 203,992
Accumulated Amortization					(54,926)	(28,200)
Acquired ANDA intangible assets
GOODWILL AND INTANGIBLE ASSETS
Gross Carrying Amount		$ 25,000	$ 4,500		42,076	42,076
Accumulated Amortization					$ (12,592)	(8,390)
Weighted Average Amortization Period		10 years	10 years	10 years	10 years
NDAs and product rights
GOODWILL AND INTANGIBLE ASSETS
Gross Carrying Amount					$ 230,974	150,250
Accumulated Amortization					$ (37,091)	(17,081)
Weighted Average Amortization Period					10 years
Marketing and distribution rights
GOODWILL AND INTANGIBLE ASSETS
Gross Carrying Amount	$ 1,000				$ 11,042	11,042
Accumulated Amortization					$ (5,087)	(2,662)
Weighted Average Amortization Period	7 years				4 years 8 months 12 days
Non-compete agreement
GOODWILL AND INTANGIBLE ASSETS
Gross Carrying Amount					$ 624	624
Accumulated Amortization					$ (156)	$ (67)
Weighted Average Amortization Period					7 years