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, 2022
Mar. 31, 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 (5,492)    
Accretion of discount 6,236 $ 5,868  
Liabilities incurred and assumed through acquisition 26,493    
Revisions of estimated liabilities 23,224    
Asset retirement obligations, end of period 474,956    
Less current portion (67,274)   $ (56,419)
Long-term $ 407,682   $ 368,076