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LONG-TERM DEBT - 14.0% Senior Notes Due 2021 (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Mar. 26, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |
Stated interest rate | 8.75% |  |
14.0% Senior Notes due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 14.00% | 14.00% | 14.00%
Principal amount issued to, and held by, a subsidiary | $ 453.9 |  |
Interest paid per annum in cash (as a percent) | 12.00% |  |
Interest paid per annum through issuance of payment-in-kind notes (as a percent) | 2.00% |  |
Senior Notes | 14.0% Senior Notes due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Principal amounts outstanding | $ 1,781.6 |  |
Stated interest rate | 14.00% |  |

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