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ACQUISITIONS AND DIVESTITURES - Divestitures (Details) $ in Thousands		3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 10, 2017 USD ($) subsidiary	Dec. 31, 2019 USD ($)	Oct. 01, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Aug. 02, 2019	Feb. 15, 2018	Feb. 16, 2017 USD ($)
Divestitures
Increase (Decrease) In Gains On Disposition Of Water Assets		$ 500	$ 3,600
Proceeds received from sales of oil and natural gas assets			$ 1,247	$ 29,029	$ 3,816
Proceeds received from sale of other operating property and equipment		$ 6			216,083
Gain (loss) from sale of other operating property and equipment					(7,235)
12.0% senior secured second lien notes due 2022
Divestitures
Interest rate (as a percent)	12.00%
6.75% senior notes due 2025
Divestitures
Repurchase of aggregate principal amount	$ 425,000
Aggregate principal amount drawn	$ 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
Williston Basin Assets
Divestitures
Gain (loss) from sale of other operating property and equipment	0				$ (7,200)	$ 485,900
Williston Basin Assets | Gas gathering systems and equipment
Divestitures
Proceeds received from sales of oil and natural gas assets	1,390,000
Proceeds received from sale of other operating property and equipment	$ 10,900
Williston Basin Assets | Disposal Group Disposed of by Sale
Divestitures
Ownership percentage disposed	100.00%
Number of subsidiaries | subsidiary	2
Proceeds received from sales of oil and natural gas assets	$ 1,400,000

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