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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Note 7 - Asset Retirement Obligations - Changes to Asset Retirement Obligation (Details)          
Asset retirement obligations, beginning of period     $ 424,495    
Liabilities settled     (39,775)    
Accretion expense $ 6,681 $ 6,028 12,917 $ 11,895  
Liabilities acquired     33,202    
Liabilities incurred     138    
Revisions of estimated liabilities     29,792    
Asset retirement obligations, end of period 460,769   460,769    
Less current portion (51,504)   (51,504)   $ (56,419)
Long-term $ 409,265   $ 409,265   $ 368,076