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SUBSEQUENT EVENTS - Pending Divestiture of Williston Basin Operated Assets (Details) $ in Millions	Jul. 25, 2017 USD ($)	Jul. 10, 2017 USD ($) subsidiary	Jun. 30, 2017	Dec. 31, 2016
12.0% senior secured second lien notes due 2022
Subsequent event
Interest rate (as a percent)		12.00%	12.00%	12.00%
Subsequent events | Williston Basin Assets | Disposal Group Disposed of by Sale
Subsequent event
Ownership percentage in subsidiaries		100.00%
Number of subsidiaries | subsidiary		2
Proceeds received from sales of oil and natural gas assets		$ 1,400.0
Escrow deposit		$ 140.0
Minimum percentage of purchase price on total adjustments for termination		15
Minimum amount of purchase price on total adjustments for termination		$ 210.0
Subsequent events | Williston Basin Assets | Disposal Group Disposed of by Sale | 12.0% senior secured second lien notes due 2022
Subsequent event
Percentage of principal amount of the outstanding 2025 Notes, held		56.00%
Percentage of indenture from holders of the 2025 Notes	99.00%
Maximum percentage of outstanding notes covered under cash offer	50.00%
Redemption price of debt instrument (as a percent)	103.00%
Percentage of consent fee paid	2.00%
Consent fee paid	$ 16.9
Subsequent events | Williston Basin Assets | Disposal Group Disposed of by Sale | Minimum
Subsequent event
Number of calendar days for mailing definitive information statement		20 days

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