FAIR VALUE OF FINANCIAL INSTRUMENTS - Carrying Value (Details) - USD ($) $ in Thousands |
Jun. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Senior Notes | ||
| Fair Value Of Instruments [Line Items] | ||
| Carrying value of debt | $ 218,453 | $ 218,269 |
| Fair value of debt | 230,468 | 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 | 17,000 | 26,000 |
| Fair value of debt | 17,000 | 26,000 |
| Term Loan B [Member] | ||
| Fair Value Of Instruments [Line Items] | ||
| Carrying value of debt | 230,000 | 242,750 |
| Fair value of debt | 230,288 | 242,447 |
| Other Debt [Member] | ||
| Fair Value Of Instruments [Line Items] | ||
| Carrying value of debt | $ 94 | $ 0 |