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ACQUISITIONS AND DIVESTITURES - Divestitures (Details) $ in Thousands				3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 19, 2017 USD ($)	Jul. 10, 2017 USD ($) subsidiary	Jan. 24, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Oct. 10, 2017 USD ($)	Sep. 07, 2017 USD ($)	Feb. 16, 2017 USD ($)
Divestitures
Proceeds received from sale of oil and natural gas properties						$ 1,647	$ 1,901,578
Aggregate principal amount				$ 625,005		625,005		$ 425,005
Proceeds received from sale of other operating property and equipment						2,236	21,291
Gain (loss) from sale of other operating property and equipment				$ (1,331)	$ 491,830	$ (7,235)	$ 727,520
12.0% senior secured second lien notes due 2022
Divestitures
Interest rate (as a percent)		12.00%
6.75% senior notes due 2025
Divestitures
Principal amount repurchased									$ 425,000
Aggregate principal amount										$ 850,000	$ 850,000
Interest rate (as a percent)				6.75%		6.75%		6.75%		6.75%	6.75%
Gain on sale of oil and natural gas assets
Divestitures
Gain (loss) from sale of other operating property and equipment		$ 0	$ 0
Williston Basin Assets
Divestitures
Gain (loss) from sale of other operating property and equipment		0				$ (7,200)		$ 485,900
Williston Basin Assets | Other operating property and equipment
Divestitures
Proceeds received from sale of oil and natural gas properties		1,390,000
Proceeds received from sale of other operating property and equipment		$ 10,900
Williston Basin Assets | 6.75% senior notes due 2025
Divestitures
Principal amount repurchased										$ 425,000
Williston Basin Assets | Disposal Group Disposed of by Sale
Divestitures
Ownership percentage in subsidiaries		100.00%
Number of subsidiaries | subsidiary		2
Proceeds received from sale of oil and natural gas properties		$ 1,400,000
El Halcon Assets
Divestitures
Gain (loss) from sale of other operating property and equipment			0
El Halcon Assets | Other operating property and equipment
Divestitures
Proceeds received from sale of oil and natural gas properties			484,100
Proceeds received from sale of other operating property and equipment			10,200
El Halcon Assets | Gain on sale of oil and natural gas assets
Divestitures
Gain (loss) from sale of other operating property and equipment								$ 235,700
El Halcon Assets | Disposal Group Disposed of by Sale
Divestitures
Proceeds from sales of interests			$ 491,100
Non-operating owner | Williston Basin Assets
Divestitures
Proceeds from sales of interests	$ 103,400
Gain (loss) on sale	$ 0

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