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Dispositions (Narrative) (Details) - Discontinued Operations [Member] - Joint Operating With Republic Of Angola [Member] - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Nov. 30, 2006 | Mar. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |
Joint operation agreement related to third party in working interest percentage | 40.00% |  |
Additional joint operation agreement related to third party in working interest percentage | 10.00% |  |
Stipulated payment for each exploration well, under PSA terms | $ 10.0 |  |
Drilling commitment, net | $ 5.0 |  |
Liability for the potential payment |  | $ 4.5 | $ 15.0
Write off of receivable |  | $ 3.3 |

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