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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2023
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of asset retirement obligations | The following table describes the changes in our AROs (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022 |  | 2021
AROs at January 1, | ​ | $ | 51,956 | ​ | $ | 29,658 | ​ | $ | 30,913
Liability incurred during the period | ​ | ​ | — | ​ | ​ | 23,601 | ​ | ​ | —
Revisions in estimates | ​ |  | 3,257 | ​ |  | (3,285) | ​ |  | (2,631)
Accretion expense | ​ |  | 6,143 | ​ |  | 1,982 | ​ |  | 1,376
AROs at December 31, | ​ | $ | 61,356 | ​ | $ | 51,956 | ​ | $ | 29,658
​

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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