Annual report pursuant to Section 13 and 15(d)

ASSET RETIREMENT OBLIGATIONS (Details)

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ASSET RETIREMENT OBLIGATIONS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Asset Retirement Obligations - Changes to Asset Retirement Obligation (Details)      
Asset retirement obligations, beginning of period $ 466,430 $ 424,495  
Liabilities settled (33,970) (76,225)  
Accretion expense 29,018 26,508 $ 22,925
Liabilities acquired 16,352 33,202  
Liabilities incurred 129 138  
Revisions of estimated liabilities 20,856 58,312  
Asset retirement obligations, end of period 498,815 466,430 $ 424,495
Less: Current portion (31,553) (25,359)  
Long-term $ 467,262 $ 441,071