DEBT - Summary of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Less: Deferred financing costs	$ (3,668)	$ (12,452)
Total Debt	477,405	451,934
Less: Current portion	(1,731)	(18,521)
Long-term debt, net of current portion	475,674	433,413
Senior Credit Facilities
Debt Instrument [Line Items]
Long-term debt	0	265,507
First Lien Note Facility, net of unamortized discount
Debt Instrument [Line Items]
Long-term debt	198,000	0
Second Lien Note Facility, net of unamortized discount
Debt Instrument [Line Items]
Long-term debt	82,931	0
2021 Notes
Debt Instrument [Line Items]
Long-term debt	197,008	196,670
Capital leases
Debt Instrument [Line Items]
Capital leases	$ 3,134	$ 2,209

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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