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Summary of significant accounting policies - Oil and natural gas properties (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accounting Policies [Abstract] |  |  |  |
Exploratory wells capitalized whose proved reserves are yet to be determined | $ 0 | $ 0 |  |
Depletion | 160,200,000 | 105,300,000 | $ 94,200,000 |
Interest costs capitalized | 1,000,000 | 0 | $ 0 |
Impairment of oil and gas properties | $ 26,500,000 | $ 0 |  | $ 0

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- Definition Amount of interest expense for capitalized exploratory well costs. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Additions to capitalized exploratory well costs that were added during the reporting period pending the determination of proved reserves. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 1B -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482274/932-235-50-1B + Details
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- Definition The noncash expense charged against earnings to recognize the consumption of natural resources. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 360 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482099/360-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482450/932-360-35-11 + Details
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