DEBT (Details) - USD ($)				9 Months Ended	12 Months Ended
	Sep. 09, 2015	Apr. 02, 2015	Sep. 09, 2014	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Long-term debt
Effective interest rate (as a percent)				10.00%	10.00%
Equity component of convertible debt issued, net of tax						$ 73,272,000
Net deferred tax liability						22,988,000
Carrying amounts of the liability component
Net carrying amount of the liabilty component				$ 243,035,000	$ 243,035,000	229,891,000
Net carrying amount of the Senior Notes				563,473,000	563,473,000
Interest expense incurred
Unamortized discount and debt issuance costs				107,700,000	107,700,000
Convertible debt
Long-term debt
Equity component of convertible debt issued, net of tax			$ 73,300,000
Interest expense incurred
Unamortized discount and debt issuance costs				102,000,000	102,000,000
Other Assets
Interest expense incurred
Unamortized discount and debt issuance costs				$ 5,700,000	$ 5,700,000
Senior Notes
Long-term debt
Aggregate principal amount of notes issued		$ 575,000,000
Effective interest rate (as a percent)				10.75%	10.75%
Proceeds from the issuance of debt		$ 562,000,000
April 2, 2018					$ 57,500,000
April 2, 2019					115,000,000
April 2, 2020					115,000,000
April 2, 2021					143,750,000
April 2, 2022					143,750,000
Amount that can be paid after first year but before second anniversary					100,000,000
Threshold limit to repay principal amount outstanding in full					100,000,000
Threshold limit of asset dispositions which is required to make mandatory prepayments on senior notes					10,000,000
Principal amount				$ 575,000,000	575,000,000
Carrying amounts of the liability component
Principal amount of the Notes				575,000,000	575,000,000
Unamortized debt issuance costs				(11,527,000)	(11,527,000)
Net carrying amount of the Senior Notes				563,473,000	563,473,000
Interest expense incurred
Contractual/Stated interest					46,874,000
Amortization of debt discount and debt issuance costs					1,466,000
Total interest expense					48,340,000
Senior Notes | Other Assets
Long-term debt
Debt issuance costs				500,000
Senior Notes | Three month LIBOR
Long-term debt
Basis spread (as a percent)		9.75%
Debt instrument, floor rate (as a percent)		1.00%
Interest rate through third anniversary (as a percent)		11.95%
Interest rate after third anniversary (as a percent)		12.95%
Senior Notes | NUCYNTA
Long-term debt
Proceeds from the issuance of debt		$ 550,000,000
Convertible debt
Long-term debt
Aggregate principal amount of notes issued			575,000,000	$ 345,000,000	$ 345,000,000
Net proceeds from debt offering			334,200,000
Underwriting discount			10,400,000
Offering expenses			$ 400,000
Interest rate (as a percent)			2.50%	2.50%	2.50%
Conversion price (in dollars per share)			$ 19.24
Effective interest rate (as a percent)			9.34%
Liability component of debt			$ 226,000,000
Equity component of debt			$ 119,000,000
Consecutive trading days, period	30 days
Stock price trigger			$ 25.01
Stock price trigger (as a percent)			130.00%
Business days, period			5 days
Principal amount	$ 345,000,000		$ 1,000
Maximum product of the closing sale price of shares of the Company's common stock and the applicable conversion rate for such trading day (as a percent)			98.00%
Observation period			40 days
Carrying amounts of the liability component
Net carrying amount of the liabilty component				$ 243,035,000	$ 243,035,000	229,891,000
Principal amount of the Notes				345,000,000	345,000,000	345,000,000
Unamortized debt issuance costs				$ (101,965,000)	(101,965,000)	(115,109,000)
Interest expense incurred
Contractual/Stated interest					8,625,000	2,683,000
Amortization of debt discount and debt issuance costs					14,163,000	4,200,000
Total interest expense					$ 22,788,000	$ 6,883,000
Convertible debt | Other Assets
Long-term debt
Debt issuance costs			$ 7,100,000
Convertible debt | Additional Paid-In Capital
Long-term debt
Equity issuance costs			$ 3,700,000