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LONG-TERM DEBT - 6.75% Senior Notes (Details) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 15, 2018 | Oct. 10, 2017 | Sep. 07, 2017 | Jul. 25, 2017 | Feb. 16, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Current and long-term debt |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 625,005 |  | $ 425,005
Accrued and unpaid interest |  | $ 4,100 |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  |  |  | $ (56,898) |
6.75% senior notes due 2025 |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 850,000 |  | $ 850,000 |  |  |  |
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% |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  | $ 56,900 |  |  |
Loss on the write-off of the discount on notes |  |  |  |  |  | 26,000 |  |  |
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 | $ 425,000 |  |  |  |  |  |
Loss on the repurchase for the tender premium paid |  |  |  |  |  | $ 30,900 |  |  |
Period within which to complete exchange offer after closing |  |  |  |  |  |  | 180 days |  |
Unamortized discount |  |  |  |  |  |  | $ 7,700 |  | $ 8,100
Additional 2025 Notes |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |
Principal amount | $ 200,000 |  |  |  |  |  |  |  |
Net proceeds from issuance | $ 202,400 |  |  |  |  |  |  |  |
Redemption price of debt instrument (as a percent) | 103.00% |  |  |  |  |  |  |  |
Issue price as a percentage of par value | 103.00% |  |  |  |  |  |  |  |
Unamortized premium related to debt issued |  |  |  |  |  |  | $ 5,700 |  |
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 |  |  |  |  |  |

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