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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Taxes [Line Items] |  |  |  |
Effective income tax rate |  |  | 40.60% | (56.00%)
Change in valuation allowance |  |  | $ (7,000,000.0) |
Current tax expense | $ 6,148,000 | $ 1,046,000 | 9,583,000 | $ (517,000)
Favorable oil price adjustment | 1,000,000.0 |  | 1,500,000 |
Current tax expense, net of favorable oil price adjustment | $ 5,100,000 |  | 8,100,000 |
Uncertain tax positions |  |  | $ 0 |
Authorities Other Than United States And Gabon [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Effective income tax rate |  |  | 0.00% |

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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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