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ASSET RETIREMENT OBLIGATIONS (Tables) | 6 Months Ended
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Jun. 30, 2026
ASSET RETIREMENT OBLIGATIONS |
Schedule of Changes in Asset Retirement Obligations | A summary of the changes to ARO is as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30,
​ | ​ ​ ​ | 2026 | ​ ​ ​ | 2025
Asset retirement obligations, beginning of period | ​ | $ | 561,851 | ​ | $ | 548,832
Liabilities settled | ​ |  | (20,603) | ​ |  | (15,978)
Accretion expense | ​ |  | 17,293 | ​ |  | 17,073
Disposition of oil and natural gas properties | ​ | ​ | — | ​ | ​ | (1,469)
Liabilities incurred | ​ | ​ | — | ​ | ​ | 1,029
Revisions of estimated liabilities | ​ |  | 14,694 | ​ |  | 7,306
Asset retirement obligations, end of period | ​ | ​ | 573,235 | ​ | ​ | 556,793
Less: Current portion | ​ |  | (24,411) | ​ |  | (31,813)
Long-term | ​ | $ | 548,824 | ​ | $ | 524,980
​

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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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