Quarterly report [Sections 13 or 15(d)]

ASSET RETIREMENT OBLIGATIONS (Details)

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ASSET RETIREMENT OBLIGATIONS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
ASSET RETIREMENT OBLIGATIONS          
Asset retirement obligations, beginning of period     $ 561,851 $ 548,832  
Liabilities settled     (26,512) (24,873)  
Accretion expense $ 8,606 $ 8,002 25,899 25,075  
Disposition of oil and natural gas properties       (1,469)  
Liabilities incurred       1,029  
Revisions of estimated liabilities     19,574 17,427  
Asset retirement obligations, end of period 580,812 566,021 580,812 566,021  
Less: Current portion (22,010) (34,528) (22,010) (34,528) $ (26,147)
Long-term $ 558,802 $ 531,493 $ 558,802 $ 531,493 $ 535,704