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FAIR VALUE MEASUREMENTS - NARRATIVE (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Apr. 01, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proved oil and gas property impairments	$ 0	$ 0	$ 0	$ 0
HighPoint Merger | Senior Notes Due 2026, 7.50% | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate					7.50%
Aggregate principal amount					$ 100,000,000
Debt issuance costs, discounts or premiums					$ 0
HighPoint Merger | Senior Notes Due 2026, 7.50% | Senior Notes | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt, estimated fair value	$ 100,800,000		$ 100,800,000

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- Definition

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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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