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DEBT - 6.75% Senior Notes (Details) - USD ($) $ in Thousands | Feb. 15, 2018 | Oct. 10, 2017 | Sep. 07, 2017 | Jul. 25, 2017 | Feb. 16, 2017 | Aug. 07, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Current and long-term debt |  |  |  |  |  |  |  |  |
Accrued interest expense |  |  |  |  |  |  | $ 19,310 |  | $ 16,971
Accrued and unpaid interest |  | $ 4,100 |  |  |  |  |  |  |
6.75% senior notes due 2025 |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 850,000 |  | $ 850,000 |  | $ 625,005 |  | $ 625,005
Interest rate (as a percent) |  |  |  |  | 6.75% | 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 |  |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  | $ 6,700 |  | $ 7,200
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 |  |  |  |  |  |  | $ 5,000 |  | $ 5,400
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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