FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Senior Notes
Fair Value Of Instruments [Line Items]
Carrying value of debt	$ 0	$ 218,269
Fair value of debt	0	227,000
Finance Method Lease Obligations
Fair Value Of Instruments [Line Items]
Carrying value of debt	87	0
Letter of credit
Fair Value Of Instruments [Line Items]
Carrying value of debt	670	670
Revolver, due November 23, 2016 [Member]
Fair Value Of Instruments [Line Items]
Carrying value of debt	0	26,000
Fair value of debt	0	26,000
Term Loan B [Member]
Fair Value Of Instruments [Line Items]
Carrying value of debt	0	242,750
Fair value of debt	0	242,447
New Term B Loan [Member]
Fair Value Of Instruments [Line Items]
Carrying value of debt	480,000	0
Fair value of debt	487,200	0
New Revolver [Member]
Fair Value Of Instruments [Line Items]
Carrying value of debt	0	0
Fair value of debt	$ 0	$ 0