Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Note 5 - Asset Retirement Obligations - Changes to Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Balances $ 310,137  
Liabilities settled (7,740)  
Accretion of discount 14,086  
Liabilities assumed through purchase 21,619  
Liabilities incurred 426  
Revisions of estimated liabilities 5,967  
Balances 344,495  
Less current portion 23,095 $ 24,994
Long-term $ 321,400 $ 285,143