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LONG-TERM DEBT - 6.75% Senior Notes (Details) - USD ($) $ in Thousands						3 Months Ended	8 Months Ended	12 Months Ended
	Feb. 15, 2018	Oct. 10, 2017	Sep. 07, 2017	Jul. 25, 2017	Feb. 16, 2017	Mar. 31, 2017	Sep. 09, 2016	Dec. 31, 2018	Dec. 31, 2017	Oct. 07, 2017	Jul. 10, 2017	Jun. 09, 2016	Dec. 21, 2015	May 01, 2015
Current and long-term debt
Accrued interest expense								$ 16,971	$ 10,985
Accrued and unpaid interest		$ 4,100
Gains (Losses) on Extinguishment of Debt									(114,931)
Predecessor
Current and long-term debt
Interest rate (as a percent)												13.00%
Gains (Losses) on Extinguishment of Debt							$ 81,434
12.0% senior secured second lien notes due 2022
Current and long-term debt
Interest rate (as a percent)										12.00%
Gains (Losses) on Extinguishment of Debt									(29,200)
Loss on the write-off of the discount on notes									6,200
12.0% senior secured second lien notes due 2022 | Predecessor
Current and long-term debt
Principal amount													$ 112,800
Interest rate (as a percent)													12.00%
6.75% senior notes due 2025
Current and long-term debt
Principal amount			$ 850,000		$ 850,000			$ 625,005	$ 425,005		$ 850,000
Interest rate (as a percent)					6.75%			6.75%	6.75%		6.75%
Net proceeds from issuance					$ 834,100
Gains (Losses) on Extinguishment of Debt									$ (28,900)
Loss on the repurchase for the tender premium paid									12,800
Loss on the write-off of the discount on notes									8,300
Loss on write off of debt issuance costs									7,800
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								$ 7,200	$ 8,100
9.75% senior notes due 2020 | Predecessor
Current and long-term debt
Interest rate (as a percent)												9.75%
8.875% senior notes due 2021 | Predecessor
Current and long-term debt
Interest rate (as a percent)												8.875%
9.25% senior notes due 2022 | Predecessor
Current and long-term debt
Interest rate (as a percent)												9.25%
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%
Period within which to complete exchange offer after closing								180 days
Unamortized premium related to debt issued								$ 5,400
8.625% senior secured second lien notes due 2020
Current and long-term debt
Interest rate (as a percent)					8.625%
Gains (Losses) on Extinguishment of Debt						$ (56,900)
Loss on the repurchase for the tender premium paid						30,900
Loss on the write-off of the discount on notes						$ 26,000
8.625% senior secured second lien notes due 2020 | Predecessor
Current and long-term debt
Principal amount														$ 700,000
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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