FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Long-term debt	$ 94,303,000	$ 121,293,000
Level 2 | 2023 Notes and Second Lien Notes | Estimated Fair Value
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of long-term debt	66,200
Level 2 | 2023 Notes and Second Lien Notes | Carrying Value
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Long-term debt	$ 50,500
Level 2 | Senior Notes and Second Lien Notes | Estimated Fair Value
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of long-term debt		32,300
Level 2 | Senior Notes and Second Lien Notes | Carrying Value
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Long-term debt		$ 86,900