DEBT - Summary of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term Debt	$ 409,851
Less: Deferred financing costs	(13,325)	$ (15,863)
Total Debt	436,241	418,121
Less: Current portion	48,189	24,380
Long-term debt, net of current portion	388,052	393,741
Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt	39,000	15,000
Term Loan Facilities
Debt Instrument [Line Items]
Long-term Debt	213,345	222,757
Long-term debt, net of current portion	166,300
2021 Notes
Debt Instrument [Line Items]
Long-term Debt	196,506	196,038
Capital Lease Obligations
Debt Instrument [Line Items]
Capital leases	$ 715	$ 189

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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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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