Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Disclosures - Cost Incurred in Oil and Gas Property Acquisition Exploration and Development Activities (Details)

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Supplemental Oil and Gas Disclosures - Cost Incurred in Oil and Gas Property Acquisition Exploration and Development Activities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Costs incurred:      
Proved properties acquisitions [1] $ 24.1 $ 1.1 $ 1.3
Exploration [1],[2],[3] 49.9 62.0 4.8
Development [1] 56.2 92.5 56.9
Unproved property acquisitions [1]     0.5
Total costs incurred in oil and gas property acquisition, exploration and development activities [1] $ 130.2 $ 155.6 $ 63.5
[1] Includes net additions from capitalized ARO of $20.3 million, $21.3 million and $10.8 million during 2018, 2017 and 2016, respectively. These adjustments for ARO are associated with acquisitions, liabilities incurred, divestitures and revisions of estimates.
[2] Includes geological and geophysical costs charged to expense of $5.4 million, $4.2 million and $4.1 million during 2018, 2017 and 2016, respectively.
[3] Includes seismic costs of $1.5 million, $0.5 million and $0.2 million incurred during 2018, 2017 and 2016, respectively.