FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value (Details) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Senior Notes | ||
| Fair Value Of Instruments [Line Items] | ||
| Carrying value of debt | $ 218,269 | $ 217,929 |
| Fair value of debt | 227,000 | 237,134 |
| 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 | 620 |
| Revolver, due November 23, 2016 [Member] | ||
| Fair Value Of Instruments [Line Items] | ||
| Carrying value of debt | 26,000 | 0 |
| Fair value of debt | 26,000 | 0 |
| Term Loan B [Member] | ||
| Fair Value Of Instruments [Line Items] | ||
| Carrying value of debt | 242,750 | 262,000 |
| Fair value of debt | $ 242,447 | $ 261,345 |