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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
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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