FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Senior Notes
Fair Value Of Instruments [Line Items]
Carrying value of debt	$ 218,549	$ 218,269
Fair value of debt	227,291	227,000
Finance Method Lease Obligations
Fair Value Of Instruments [Line Items]
Carrying value of debt	0	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	225,000	242,750
Fair value of debt	226,406	242,447
Other Debt [Member]
Fair Value Of Instruments [Line Items]
Carrying value of debt	$ 90	$ 0