LONG-TERM DEBT LIABILITIES - Senior Unsecured Debt (Details) - USD ($) $ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2011 |
|---|---|---|---|
| Debt Instrument [Line Items] | |||
| Senior Notes | $ 414,158 | $ 416,584 | |
| Debt Instrument, Interest Rate, Stated Percentage | 7.25% | ||
| Senior Unsecured Debt | |||
| Debt Instrument [Line Items] | |||
| Senior Notes | $ 220,000 | ||
| Debt Instrument, Interest Rate, Stated Percentage | 10.50% | ||
| Senior Unsecured Debt | On or After November 1, 2019 | |||
| Debt Instrument [Line Items] | |||
| Redemption of the principal amount | 105.438% | ||
| Senior Unsecured Debt | On or after November 1, 2020 | |||
| Debt Instrument [Line Items] | |||
| Redemption of the principal amount | 103.625% | ||
| Senior Unsecured Debt | On or after November 1, 2021 | |||
| Debt Instrument [Line Items] | |||
| Redemption of the principal amount | 101.813% | ||
| Senior Unsecured Debt | On or after November 1, 2022 | |||
| Debt Instrument [Line Items] | |||
| Redemption of the principal amount | 100.00% |