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Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands, in Billions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 17, 2018 XAF ( ) | Sep. 17, 2018 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 XAF ( ) $ / bbl / $ | Dec. 31, 2018 USD ($) $ / bbl / $
Organization And Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Capitalized oil and gas property |  |  | $ 442,203 |  | $ 409,367 |  |  | $ 443,329
Deferred tax assets |  |  | 50,195 |  | 1,260 |  |  | $ 40,077
Exchange rate | / $ |  |  |  |  |  |  | 573.000 | 573.000
Other operating income (expense), net |  |  |  | $ 365 | (84) | $ (266) |  |
Inventory write-off |  |  |  | 400 |  |  |  |
Asset retirement obligation, revision of estimate |  |  |  | (6,527) | 703 | (1) |  |
Receivable balance, net |  |  |  |  | 3,556 |  |  | $ 11,907
Value added tax and other receivables, net |  |  | 2,306 |  | 6,925 |  |  | 2,226
Gains on foreign currency transactions |  |  |  | 100 | 500 | 30 |  |
Interest expense capitalized |  |  |  | $ 0 | 0 | 0 |  |
Monthly royalty rate, based on production at the published price |  |  |  | 13.00% |  |  |  |
Working interest of carried partner, percentage |  |  |  | 7.50% |  |  |  |
Future working interest of carried partner percentage |  |  |  | 10.00% |  |  |  |
Deferred tax assets, gross |  |  |  |  | 154,465 |  |  | 131,012
Valuation allowance |  |  |  |  | 153,205 | 211,800 |  | $ 90,935
Change in valuation allowance |  |  |  | $ (16,500) | 57,600 |  |  |
Derivative cap price | $ / bbl |  |  |  |  |  |  | 74.00 | 74.00
Derivative floor price | $ / bbl |  |  |  |  |  |  | 74.00 | 74.00
Cash paid to settle derivatives |  |  |  | 700 |  |  |  |
Cash received to settle derivatives |  |  |  |  | 200 |  |  |
Restatement Adjustment [Member] |  |  |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Capitalized oil and gas property |  |  | 18,612 |  |  |  |  |
Deferred tax assets |  |  | (18,612) |  |  |  |  |
Accrued liabilities |  |  |  |  | (2,600) |  |  |
Deferred Tax Liability, Understated [Member] |  |  |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Amount misstated |  |  | $ 18,600 |  |  |  |  |
Gabon |  |  |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Other operating income (expense), net |  |  |  | 400 | (300) | (300) |  |
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 |  |  |  |  |  |
Recoveries (allowances) of VAT receivable |  |  |  | $ 100 | $ (400) | $ (700) |  |
Office Equipment |  |  |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Estimated useful life |  |  |  | 5 years |  |  |  |
Leasehold Improvements | Minimum |  |  |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Estimated useful life |  |  |  | 5 years |  |  |  |
Leasehold Improvements | Maximum |  |  |  |  |  |  |  |
Organization And Accounting Policies [Line Items] |  |  |  |  |  |  |  |
Estimated useful life |  |  |  | 7 years |  |  |  |

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