Quarterly report pursuant to Section 13 or 15(d)

ASSET RETIREMENT OBLIGATIONS - Changes to Asset Retirement Obligation (Details)

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ASSET RETIREMENT OBLIGATIONS - Changes to Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Asset Retirement Obligations - Changes to Asset Retirement Obligation (Details)          
Asset retirement obligations, beginning of period     $ 466,429 $ 424,495  
Liabilities settled     (24,918) (61,285)  
Accretion expense $ 6,414 $ 6,620 21,641 19,536  
Liabilities acquired     16,352 33,202  
Liabilities incurred     113 138  
Revisions of estimated liabilities     18,797 37,524  
Asset retirement obligations, end of period 498,414 453,610 498,414 453,610  
Less: Current portion (33,169) (54,886) (33,169) (54,886) $ (25,359)
Asset retirement obligations, less current portion $ 465,245 $ 398,724 $ 465,245 $ 398,724