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ASSET RETIREMENT OBLIGATIONS (Tables) | 9 Months Ended
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Sep. 30, 2025
ASSET RETIREMENT OBLIGATIONS |
Schedule of Changes in Asset Retirement Obligations | A summary of the changes to ARO is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Nine Months Ended September 30,
​ |  | 2025 |  | 2024
Asset retirement obligations, beginning of period | ​ | $ | 548,832 | ​ | $ | 498,815
Liabilities settled | ​ |  | (24,873) | ​ |  | (20,342)
Accretion expense | ​ |  | 25,075 | ​ |  | 24,217
Liabilities acquired | ​ |  | — | ​ |  | 17,647
Disposition of oil and natural gas properties | ​ | ​ | (1,469) | ​ | ​ | —
Liabilities incurred | ​ | ​ | 1,029 | ​ | ​ | —
Revisions of estimated liabilities | ​ |  | 17,427 | ​ |  | 34,690
Asset retirement obligations, end of period | ​ | ​ | 566,021 | ​ | ​ | 555,027
Less: Current portion | ​ |  | (34,528) | ​ |  | (45,139)
Long-term | ​ | $ | 531,493 | ​ | $ | 509,888
​

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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