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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognized (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) product	Dec. 31, 2020 USD ($)
Accounting Policies [Abstract]
Number of primary products | product	2
Contract cash settlement max days	25 days
Contract cancellable notice term	30 days
Oil and gas sales | $	$ 213,661	$ 125,016

X

- Definition

Contract cancellable notice term.

+ References

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- Definition

Contract cash settlement max days.

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- Definition

Number of primary products.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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