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BASIS OF PRESENTATION - NARRATIVE (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) contract segment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of operating segments | segment			1
Receivables from contracts with customers	$ 86,414,000		$ 86,414,000		$ 32,673,000
Abandonment and impairment of unproved properties	$ 0	$ 223,000	$ 2,215,000	$ 30,589,000
Purchase of Fresh Water Commitment
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of contracts | contract	1		1

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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