SUBSEQUENT EVENTS (Details) - USD ($)	Feb. 28, 2018	Feb. 13, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 04, 2016	Mar. 03, 2016
Subsequent Event [Line Items]
Term loan facility, outstanding			$ 1,297,023,000	$ 1,540,453,000
Subsequent Event
Subsequent Event [Line Items]
Joint venture ownership percentage		35.00%
Series A Convertible Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Convertible preferred stock sold/issued (in shares)		299,950
Sale of stock, consideration received on transaction		$ 300,000,000
Convertible debt, conversion price (in dollars per share)		$ 5.35
Term Loan Facility
Subsequent Event [Line Items]
Term loan facility, outstanding			1,130,320,000	$ 1,170,486,000
Term Loan Facility Due March 2019
Subsequent Event [Line Items]
Term loan facility, outstanding			1,131,200,000
Term Loan Facility Due March 2019 | Term Loan Facility | Subsequent Event
Subsequent Event [Line Items]
Amount available for borrowings under credit facility	$ 151,900,000
Term loan facility, outstanding	151,900,000
Maturity date extension date trigger	50,000,000
Amended Term Loan Facility Due March 2021 | Term Loan Facility | Subsequent Event
Subsequent Event [Line Items]
Term loan facility, outstanding	704,300,000
Annual principal payment	43,000,000
Revolving Credit Facility
Subsequent Event [Line Items]
Amount available for borrowings under credit facility			$ 225,000,000.0		$ 300,000,000.0	$ 130,000,000.0
Revolving Credit Facility | Asset-backed Securities | Subsequent Event
Subsequent Event [Line Items]
Principal amount	100,000,000
Term Loan | Asset-backed Securities | Subsequent Event
Subsequent Event [Line Items]
Principal amount	$ 275,000,000
Harbin Pharmaceutical Group | Subsequent Event
Subsequent Event [Line Items]
Ownership percentage, parent		65.00%