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ACQUISITIONS AND DIVESTITURES - Divestitures (Details) $ in Thousands |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 19, 2017 USD ($) | Jul. 10, 2017 USD ($) subsidiary | Jan. 24, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Oct. 10, 2017 USD ($) | Sep. 07, 2017 USD ($) | Feb. 16, 2017 USD ($)
Divestitures |  |  |  |  |  |  |  |  |  |  |
Proceeds received from sale of oil and natural gas properties |  |  |  |  |  | $ 1,647 | $ 1,901,578 |  |  |  |
Aggregate principal amount |  |  |  | $ 625,005 |  | 625,005 |  | $ 425,005 |  |  |
Proceeds received from sale of other operating property and equipment |  |  |  |  |  | 2,236 | 21,291 |  |  |  |
Gain (loss) from sale of other operating property and equipment |  |  |  | $ (1,331) | $ 491,830 | $ (7,235) | $ 727,520 |  |  |  |
12.0% senior secured second lien notes due 2022 |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 12.00% |  |  |  |  |  |  |  |  |
6.75% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |
Principal amount repurchased |  |  |  |  |  |  |  |  | $ 425,000 |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 850,000 | $ 850,000
Interest rate (as a percent) |  |  |  | 6.75% |  | 6.75% |  | 6.75% |  | 6.75% | 6.75%
Gain on sale of oil and natural gas assets |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from sale of other operating property and equipment |  | $ 0 | $ 0 |  |  |  |  |  |  |  |
Williston Basin Assets |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from sale of other operating property and equipment |  | 0 |  |  |  | $ (7,200) |  | $ 485,900 |  |  |
Williston Basin Assets | Other operating property and equipment |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |
Proceeds received from sale of oil and natural gas properties |  | 1,390,000 |  |  |  |  |  |  |  |  |
Proceeds received from sale of other operating property and equipment |  | $ 10,900 |  |  |  |  |  |  |  |  |
Williston Basin Assets | 6.75% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |
Principal amount repurchased |  |  |  |  |  |  |  |  |  | $ 425,000 |
Williston Basin Assets | Disposal Group Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |
Ownership percentage in subsidiaries |  | 100.00% |  |  |  |  |  |  |  |  |
Number of subsidiaries | subsidiary |  | 2 |  |  |  |  |  |  |  |  |
Proceeds received from sale of oil and natural gas properties |  | $ 1,400,000 |  |  |  |  |  |  |  |  |
El Halcon Assets |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from sale of other operating property and equipment |  |  | 0 |  |  |  |  |  |  |  |
El Halcon Assets | Other operating property and equipment |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |
Proceeds received from sale of oil and natural gas properties |  |  | 484,100 |  |  |  |  |  |  |  |
Proceeds received from sale of other operating property and equipment |  |  | 10,200 |  |  |  |  |  |  |  |
El Halcon Assets | Gain on sale of oil and natural gas assets |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |
Gain (loss) from sale of other operating property and equipment |  |  |  |  |  |  |  | $ 235,700 |  |  |
El Halcon Assets | Disposal Group Disposed of by Sale |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of interests |  |  | $ 491,100 |  |  |  |  |  |  |  |
Non-operating owner | Williston Basin Assets |  |  |  |  |  |  |  |  |  |  |
Divestitures |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of interests | $ 103,400 |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale | $ 0 |  |  |  |  |  |  |  |  |  |

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