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DEBT - Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Feb. 11, 2014
Debt Instrument [Line Items]
Long-term debt	$ 502,863
Less: Deferred financing costs	(3,656)	$ (12,452)
Total Debt	480,588	451,934
Less: Current portion	(1,722)	(18,521)
Long-term debt, net of current portion	478,866	433,413
First Lien Note Facility, net of unamortized discount
Debt Instrument [Line Items]
Long-term debt	198,324	0
Second Lien Note Facility, net of unamortized discount
Debt Instrument [Line Items]
Long-term debt	85,694	0
2021 Notes, net of unamortized discount
Debt Instrument [Line Items]
Long-term debt	197,363	196,670
Less: Deferred financing costs			$ (500)
Term Loan Facilities
Debt Instrument [Line Items]
Long-term debt	0	210,207
Capital leases
Debt Instrument [Line Items]
Capital leases	2,863	2,209
Senior Credit Facilities \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 55,300