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Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 30, 2023
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of asset retirement obligations | The following table describes the changes in our AROs (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2023 |  | 2022
AROs at January 1, | ​ | $ | 51,956 | ​ | $ | 29,658
Accretion expense | ​ |  | 2,364 | ​ |  | 1,303
AROs at June 30, | ​ | $ | 54,320 | ​ | $ | 30,961

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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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