Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Asset Retirement Obligations - Changes to Asset Retirement Obligation (Details)      
Asset retirement obligations, beginning of period $ 424,495 $ 392,704  
Liabilities settled (76,225) (27,309)  
Accretion expense 26,508 22,925 $ 22,521
Liabilities acquired 33,202 454  
Liabilities incurred 138    
Revisions of estimated liabilities 58,312 35,721  
Asset retirement obligations, end of period 466,430 424,495 $ 392,704
Less: Current portion (25,359) (56,419)  
Long-term $ 441,071 $ 368,076