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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Taxes [Abstract] |
Provision for Income Taxes |
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
U.S. Federal: | (in thousands)
Current | $ | (337) |  | $ | (337) |  | $ | (674)
Deferred |  | 11,814 |  |  | 3,916 |  |  | (15,910)
Foreign: |  |  |  |  |  |  |  |
Current |  | 3,859 |  |  | 9,747 |  |  | 14,327
Deferred |  | 12,345 |  |  | 10,564 |  |  | (40,997)
Total | $ | 27,681 |  | $ | 23,890 |  | $ | (43,254)
Summary of Differences between the Financial Statement and Tax Bases of Assets and Liabilities |
|  | As of December 31,
(in thousands) |  | 2020 |  | 2019
Deferred tax assets: |  |  |  |  |  |
Basis difference in fixed assets |  | $ | 27,995 |  | $ | 26,590
Foreign tax credit carryforward |  |  | 34,144 |  |  | 34,144
Alternative minimum tax credit carryover |  |  | — |  |  | 337
U.S. federal net operating losses |  |  | 32,579 |  |  | 30,572
Foreign net operating losses |  |  | 24,602 |  |  | 11,770
Asset retirement obligations |  |  | 3,640 |  |  | 3,407
Operating leases |  |  | 1,472 |  |  | —
Basis difference in accrued liabilities |  |  | 368 |  |  | 676
Basis difference in receivables |  |  | 331 |  |  | 171
Other |  |  | 1,121 |  |  | 1,120
Total deferred tax assets |  |  | 126,252 |  |  | 108,787
Valuation allowance |  |  | (126,252) |  |  | (84,628)
Net deferred tax assets |  | $ | — |  | $ | 24,159
Pretax Income |
|  | Year Ended December 31,
(in thousands) |  | 2020 |  | 2019 |  | 2018
U.S. |  | $ | (2,908) |  | $ | (13,330) |  | $ | (5,672)
Foreign |  |  | (17,494) |  |  | 34,372 |  |  | 61,146
|  | $ | (20,402) |  | $ | 21,042 |  | $ | 55,474
Statutory Rate Reconciliation |
|  | Year Ended December 31,
(in thousands) |  | 2020 |  | 2019 |  | 2018
Tax provision computed at U.S. statutory rate |  | $ | (4,284) |  | $ | 4,386 |  | $ | 11,650
Foreign taxes not offset in U.S. by foreign tax credits |  |  | (9,801) |  |  | 16,015 |  |  | 24,840
Recognition of foreign deferred tax assets, net of U.S. impact |  |  | — |  |  | — |  |  | (45,751)
Unrealizable foreign deferred tax assets |  |  | — |  |  | — |  |  | 24,176
Permanent differences |  |  | 97 |  |  | 180 |  |  | (104)
Foreign tax credit expirations |  |  | — |  |  | 9,616 |  |  | 4,311
Increase/(decrease) in valuation allowance |  |  | 41,635 |  |  | (6,307) |  |  | (62,270)
Other |  |  | 34 |  |  | — |  |  | (106)
Total income tax expense (benefit) |  | $ | 27,681 |  | $ | 23,890 |  | $ | (43,254)
Income Tax Years Subject to Examination by Major Tax Jurisdictions |
Jurisdiction |  | Years
U.S. |  | 2011-2020
Gabon |  | 2016-2020

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of income tax examinations that an enterprise is currently subject to or that have been completed in the current period typically including a description of the examination, the jurisdiction conducting the examination, the tax year(s) under examination, the likelihood of an unfavorable settlement, the range of possible losses, the liability recorded, the increase or decrease in the liability from the prior period, and any penalties and interest that have been recorded. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=117331294&loc=d3e36027-109320 + Details
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