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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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