FAIR VALUE MEASURMENTS (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	$ 506,018
2017 warrants	25,331
Carrying Value | First Lien Note Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	198,962
Carrying Value | Second Lien Note Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	108,931
Carrying Value | 2021 Notes Indenture
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	198,125
Fair Value | Markets for Identical Item (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	0
2017 warrants	0
Fair Value | Markets for Identical Item (Level 1) | First Lien Note Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	0
Fair Value | Markets for Identical Item (Level 1) | Second Lien Note Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	0
Fair Value | Markets for Identical Item (Level 1) | 2021 Notes Indenture
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	0
Fair Value | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	186,500
2017 warrants	25,331
Fair Value | Significant Other Observable Inputs (Level 2) | First Lien Note Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	0
Fair Value | Significant Other Observable Inputs (Level 2) | Second Lien Note Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	0
Fair Value | Significant Other Observable Inputs (Level 2) | 2021 Notes Indenture
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	186,500
Fair Value | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	325,084
2017 warrants	0
Fair Value | Significant Unobservable Inputs (Level 3) | First Lien Note Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	203,462
Fair Value | Significant Unobservable Inputs (Level 3) | Second Lien Note Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	121,622
Fair Value | Significant Unobservable Inputs (Level 3) | 2021 Notes Indenture
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total debt instruments	$ 0