LONG-TERM DEBT AND CAPITAL LEASE - Redemption of Senior Secured Notes (Details) - Senior Secured Notes - Senior Secured Notes Due 2024 |
6 Months Ended |
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Jun. 30, 2018 | |
| On February 2, 2019 to February 1, 2020 | |
| Line of Credit Facility [Line Items] | |
| Percentage Premium | 2.00% |
| On February 2, 2020 to February 1, 2021 | |
| Line of Credit Facility [Line Items] | |
| Percentage Premium | 1.50% |
| On February 2, 2021 to February 1, 2022 | |
| Line of Credit Facility [Line Items] | |
| Percentage Premium | 0.50% |
| On or after February 2, 2022 | |
| Line of Credit Facility [Line Items] | |
| Percentage Premium | 0.00% |
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