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
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Asset Retirement Obligations - Changes to Asset Retirement Obligation (Details)      
Asset retirement obligations, beginning of period $ 466,430    
Liabilities settled (8,642)    
Accretion expense 7,510 $ 6,236  
Liabilities incurred 110    
Revisions of estimated liabilities 3,798    
Asset retirement obligations, end of period 469,206    
Less: Current portion (9,859)   $ (25,359)
Long-term $ 459,347   $ 441,071