Annual report pursuant to Section 13 and 15(d)

Note 6 - Asset Retirement Obligations - Changes to Asset Retirement Obligation (Details)

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Note 6 - Asset Retirement Obligations - Changes to Asset Retirement Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Asset retirement obligations $ 310,137 $ 300,446  
Liabilities settled (11,443) (28,617)  
Asset retirement obligations accretion 19,460 18,431 $ 17,172
Liabilities incurred and assumed through acquisition 29,887 4,286  
Revisions of estimated liabilities (1) (2) [1],[2] 7,553 15,591  
Asset retirement obligations 355,594 310,137 $ 300,446
Less current portion 21,991 24,994  
Long-term $ 333,603 $ 285,143  
[1] Revisions in 2018 reflect cost estimate increases as a result of new data on the required scope of work becoming available to us through 2018. This new data included data realized during the planning phase of the projects, and as the projects proceeded through the execution phase. This new data indicated that the scope was larger and more difficult than the scope used for end of 2017 estimates. As an example, larger heavy lift vessels would be needed for certain platform removals, and certain wells needed additional well plugging operations to complete the decommissioning per agency requirements.
[2] Revisions in 2019