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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Taxes [Abstract] |
Provision for Income Taxes |
| Years Ended December 31,
| 2019 |  | 2018 |  | 2017
U.S. Federal: | (in thousands)
Current | $ | (337) |  | $ | (674) |  | $ | —
Deferred |  | 3,916 |  |  | (15,910) |  |  | (1,260)
Foreign: |  |  |  |  |  |  |  |
Current |  | 9,747 |  |  | 14,327 |  |  | 11,638
Deferred |  | 10,564 |  |  | (40,997) |  |  | —
Total | $ | 23,890 |  | $ | (43,254) |  | $ | 10,378
Summary of Differences between the Financial Statement and Tax Bases of Assets and Liabilities |
|  | As of December 31,
(in thousands) |  | 2019 |  | 2018
Deferred tax assets: |  |  |  |  |  |
Basis difference in fixed assets |  | $ | 26,590 |  | $ | 38,479
Foreign tax credit carryforward |  |  | 34,144 |  |  | 43,760
Alternative minimum tax credit carryover |  |  | 337 |  |  | 674
U.S. federal net operating losses |  |  | 30,572 |  |  | 20,616
Foreign net operating losses |  |  | 11,770 |  |  | 19,989
Asset retirement obligations |  |  | 3,407 |  |  | 3,111
Basis difference in accrued liabilities |  |  | 676 |  |  | 3,816
Basis difference in receivables |  |  | 171 |  |  | 387
Other |  |  | 1,120 |  |  | 180
Total deferred tax assets |  |  | 108,787 |  |  | 131,012
Valuation allowance |  |  | (84,628) |  |  | (90,935)
Net deferred tax assets |  | $ | 24,159 |  | $ | 40,077
Pretax Income |
|  | Year Ended December 31,
(in thousands) |  | 2019 |  | 2018 |  | 2017
U.S. |  | $ | (13,330) |  | $ | (5,672) |  | $ | (9,453)
Foreign |  |  | 34,372 |  |  | 61,146 |  |  | 30,103
|  | $ | 21,042 |  | $ | 55,474 |  | $ | 20,650
Statutory Rate Reconciliation |
|  | Year Ended December 31,
(in thousands) |  | 2019 |  | 2018 |  | 2017
Tax provision computed at U.S. statutory rate |  | $ | 4,386 |  | $ | 11,650 |  | $ | 7,228
Foreign taxes not offset in U.S. by foreign tax credits |  |  | 16,015 |  |  | 24,840 |  |  | 6,775
Impact of Tax Reform Act |  |  | — |  |  | — |  |  | 52,449
Recognition of foreign deferred tax assets, net of U.S. impact |  |  | — |  |  | (45,751) |  |  | —
Unrealizable foreign deferred tax assets |  |  | — |  |  | 24,176 |  |  | —
Effect of change in foreign statutory rates |  |  | — |  |  | — |  |  | —
Permanent differences |  |  | 180 |  |  | (104) |  |  | 309
Foreign tax credit expirations |  |  | 9,616 |  |  | 4,311 |  |  | 2,394
Increase/(decrease) in valuation allowance |  |  | (6,307) |  |  | (62,270) |  |  | (58,777)
Other |  |  | — |  |  | (106) |  |  | —
Total income tax expense (benefit) |  | $ | 23,890 |  | $ | (43,254) |  | $ | 10,378
Income Tax Years Subject to Examination by Major Tax Jurisdictions |
Jurisdiction |  | Years
U.S. |  | 2009-2019
Gabon |  | 2015-2019

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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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