DEBT - Summary of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Less: Deferred financing costs	$ (2,692)	$ (3,656)
Total Debt	498,846	480,588
Less: Current portion of long-term debt	(2,076)	(1,722)
Long-term debt, net of current portion	496,770	478,866
First Lien Note Facility, net of unamortized discount
Debt Instrument [Line Items]
Long-term debt	198,801	198,324
Second Lien Note Facility, net of unamortized discount
Debt Instrument [Line Items]
Long-term debt	103,571	85,694
2021 Notes
Debt Instrument [Line Items]
Long-term debt	197,927	197,363
Capital leases
Debt Instrument [Line Items]
Capital leases	$ 1,239	$ 2,863

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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