Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Asset Retirement Obligations - Changes to Asset Retirement Obligation (Details)

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Note 5 - Asset Retirement Obligations - Changes to Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Balances, December 31, 2019 $ 355,594  
Liabilities settled (249)  
Accretion of discount 5,716  
Liabilities incurred, including acquisitions 2,704  
Revisions of estimated liabilities 335  
Balances, March 31, 2020 364,100  
Less current portion 2,803 $ 21,991
Long-term $ 361,297 $ 333,603