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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	Mar. 31, 2019	Dec. 31, 2018
Current and long-term debt
Accrued interest expense						$ 6,343	$ 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%
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						$ 7,000	$ 7,200
Unamortized premium related to debt issued						5,200	$ 5,400
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						$ 5,200
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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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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