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Acquisition (Pro Forma Financial Information) (Details) - Petrobas America Inc - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Pro Forma Financial Information |  |
Revenues | $ 874,631 | $ 1,453,711
Net Income Attributable to Murphy | $ 246,889 | $ 458,386
Net Income Attributable to PAI per Common Share [Abstract] |  |
Basic | $ 1.43 | $ 2.65
Diluted | $ 1.42 | $ 2.62

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