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Derivative financial instruments - Impact of commodity derivatives on earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative instruments
Gain (loss) on commodity derivatives	$ 25,544	$ (25,324)	$ (32,389)
Net cash receipts from (payments on) commodity derivatives	22,895	(42,437)	(25,219)
Oil derivatives
Derivative instruments
Gain (loss) on commodity derivatives	6,459	(14,985)	(24,885)
Net cash receipts from (payments on) commodity derivatives	4,576	(23,695)	(19,034)
Natural gas derivatives
Derivative instruments
Gain (loss) on commodity derivatives	19,085	(10,339)	(7,504)
Net cash receipts from (payments on) commodity derivatives	$ 18,319	$ (18,742)	$ (6,185)

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- Definition

The net cash outflow or inflow from derivative instruments during the period, which are classified as operating activities, excluding those designated as hedging instruments.

+ References

No definition available.

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
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-Topic 815
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4CC

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
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