DEBT - Summary of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt	$ 402,937
Less: Deferred financing costs	(12,271)	$ (12,452)
Total Debt	472,498	451,934
Less: Current portion	(22,426)	(18,521)
Long-term debt, net of current portion	450,072	433,413
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	54,862	55,300
Term Loan Facilities
Debt Instrument [Line Items]
Long-term debt	207,070	210,207
Long-term debt, net of current portion	194,900
Priming Credit Facility
Debt Instrument [Line Items]
Long-term debt	25,000	0
2021 Notes
Debt Instrument [Line Items]
Long-term debt	195,867	196,670
Capital leases
Debt Instrument [Line Items]
Capital leases	$ 1,970	$ 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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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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