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DEBT - 6.75% Senior Notes (Details) - USD ($) $ in Thousands |  |  |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 07, 2019 | Feb. 15, 2018 | Oct. 10, 2017 | Sep. 07, 2017 | Jul. 25, 2017 | Feb. 16, 2017 | Sep. 30, 2019 | Aug. 02, 2019 | Dec. 31, 2018
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |
Accrued and unpaid interest |  |  | $ 4,100 |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  |  | $ 0 |  |  | $ 11,100 |
Write-off debt discounts/premium and debt issuance costs |  |  |  |  |  |  | 10,953 |  |  |  |
6.75% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | $ 850,000 |  | $ 850,000 | $ 625,005 | [1] |  | $ 625,005 | [1]
Interest rate (as a percent) |  |  |  |  |  | 6.75% | 6.75% |  | 6.75% | 6.75% |
Net proceeds from issuance |  |  |  |  |  | $ 834,100 |  |  |  |  |
Redemption price of debt instrument (as a percent) |  |  | 103.00% |  |  |  |  |  |  |  |
Percentage of holders concluded a consent solicitation |  |  |  |  | 99.00% |  |  |  |  |  |
Percentage of consent fee paid |  |  |  |  | 2.00% |  |  |  |  |  |
Consent fee paid |  |  |  |  | $ 16,900 |  |  |  |  |  |
Principal amount repurchased |  |  | $ 425,000 |  |  |  |  |  |  |  |
Write-off debt discounts/premium and debt issuance costs | $ 6,600 |  |  |  |  |  |  |  |  |  |
Additional 2025 Notes |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 200,000 |  |  |  |  |  |  |  |  |
Net proceeds from issuance |  | $ 202,400 |  |  |  |  |  |  |  |  |
Issue price as a percentage of par value |  | 103.00% |  |  |  |  |  |  |  |  |
Unamortized premium related to debt issued |  |  |  |  |  |  |  |  |  | $ 5,400 |
Unamortized debt issuance costs |  |  |  |  |  |  |  |  |  | $ 10,100 |
Write-off of debt premium | $ 4,900 |  |  |  |  |  |  |  |  |  |
8.625% senior secured second lien notes due 2020 |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 8.625% |  |  |  |  |
Williston Basin Assets | 6.75% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |
Redemption price of debt instrument (as a percent) |  |  |  | 103.00% |  |  |  |  |  |  |
Principal amount repurchased |  |  |  | $ 425,000 |  |  |  |  |  |  |
[1] | The Company’s 6.75% senior notes due 2025 were cancelled on the Effective Date. See Note 2, “Reorganization,” for further details.

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