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Organization And Accounting Policies (Narrative) (Details) $ in Thousands, in Billions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 17, 2018 XAF ( ) | Sep. 17, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 XAF ( ) / $ | Sep. 30, 2018 USD ($) / $ | Dec. 31, 2017 USD ($)
Organization And Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Exchange rate | / $ |  |  |  |  |  |  | 565.129 | 565.129 |
Recorded allowance |  |  | $ (159) | $ (49) | $ (68) | $ 232 |  |  |
Receivable balance, net |  |  |  |  |  |  |  |  | $ 3,556
Transfers between levels |  |  | 0 | 0 | 0 | 0 |  |  |
Gains on foreign currency transactions |  |  | 0 | 200 | 100 | 500 |  |  |
Accrued liabilities |  |  |  |  |  |  |  | $ 17,662 | 12,991
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
ARO liability |  |  |  |  |  |  |  | (6,500) |
Gabon [Member] |  |  |  |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Recorded allowance |  |  | $ 200 | $ (100) | $ 100 | $ 200 |  |  |
Receivable balance, gross | |  |  |  |  |  |  | 6.9 |  |
Receivable balance, net | |  |  |  |  |  |  | 2.3 |  |
Reduction of VAT receivable | | 14.1 |  |  |  |  |  |  |  |
Reduction of VAT receivable, net | 4.7 | $ 4,200 |  |  |  |  |  |  |
SARs Liability [Member] |  |  |  |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Accrued liabilities |  |  |  |  |  |  |  | 2,100 |
Other long-term liabilities |  |  |  |  |  |  |  |  | $ 1,000
Derivative Liability Swaps [Member] |  |  |  |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Accrued liabilities |  |  |  |  |  |  |  | $ 2,100 |

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