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Commitments And Contingencies (Narrative) (Details) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Jun. 30, 2016 USD ($)
Commitments And Contingencies [Line Items] |  |  |
Number Monthly Payments | item | 7 |  |
Contractual Obligation Company Share |  |  | $ 5,100
Abandonment Funding | $ 8,510 | $ 8,510 |
Abandonment cost related to annual funding | 61,100 |  |
Abandonment cost related to annual funding, net | 19,000 |  |
Accrued potential fees from customs audit | 1,000 |  |
Gabon [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Abandonment Funding | 8,500 |  |
Abandonment funding, gross | $ 27,400 |  |
Accrued Payroll Taxes |  | $ 1,000 |
Offshore Gabon [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Production License Agreement Term Extended By Government | 5 years |  |
Percentage of annual funding over seven years | 12.14% |  |
Funding period for initial rate | 7 years |  |
Second funding period of production license | 3 years |  |
Percentage of annual funding over last three years | 5.00% |  |
Funding period abandonment funding | 10 years |  |
Number of contract extension periods | item | 2 |  |

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