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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Taxes [Abstract] |
Provision for Income Taxes |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year Ended December 31,
﻿(in thousands) |  | 2017 |  | 2016 |  | 2015
﻿U.S. Federal: |  |  |  |  |  |  |  |  |
﻿Current |  | $ | — |  | $ | — |  | $ | —
﻿Deferred |  |  | (1,260) |  |  | — |  |  | 1,349
﻿Foreign: |  |  |  |  |  |  |  |  |
﻿Current |  |  | 11,638 |  |  | 9,248 |  |  | 13,238
﻿Deferred |  |  | — |  |  | — |  |  | —
﻿Total |  | $ | 10,378 |  | $ | 9,248 |  | $ | 14,587
﻿ |  |  |  |  |  |  |  |  |
﻿
Summary of Differences between the Financial Statement and Tax Bases of Assets and Liabilities |
﻿ |  |  |  |  |  |
﻿ |  | As of December 31,
﻿(in thousands) |  | 2017 |  | 2016
﻿Deferred tax assets: |  |  |  |  |  |
﻿Basis difference in fixed assets |  | $ | 46,929 |  | $ | 89,016
﻿Foreign tax credit carryforward |  |  | 48,071 |  |  | 50,339
﻿Alternative minimum tax credit carryover |  |  | 1,349 |  |  | 1,349
﻿U.S. federal net operating losses |  |  | 22,490 |  |  | 30,230
﻿Foreign net operating losses |  |  | 26,371 |  |  | 25,543
﻿Asset retirement obligations |  |  | 4,234 |  |  | 6,514
﻿Basis difference in receivables |  |  | 1,331 |  |  | 1,824
﻿Other |  |  | 3,690 |  |  | 6,952
﻿Total deferred tax assets |  |  | 154,465 |  |  | 211,767
﻿Valuation allowance |  |  | (153,205) |  |  | (211,767)
﻿Net deferred tax assets |  | $ | 1,260 |  | $ | —
﻿ |  |  |  |  |  |
﻿
Pretax Income |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year Ended December 31,
﻿(in thousands) |  | 2017 |  | 2016 |  | 2015
﻿United States |  | $ | (9,453) |  | $ | (9,893) |  | $ | (15,177)
﻿Foreign |  |  | 30,103 |  |  | 874 |  |  | (90,790)
﻿ |  | $ | 20,650 |  | $ | (9,019) |  | $ | (105,967)
﻿
Statutory Rate Reconciliation |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Year Ended December 31,
﻿(in thousands) |  | 2017 |  | 2016 |  | 2015
﻿Tax provision computed at U.S. statutory rate |  | $ | 7,228 |  | $ | (3,156) |  | $ | (37,089)
﻿Foreign taxes not offset in U.S. by foreign tax credits |  |  | 6,775 |  |  | 6,319 |  |  | (394)
﻿Impact of Tax Reform Act |  |  | 52,449 |  |  | — |  |  | —
﻿Effect of change in foreign statutory rates |  |  | — |  |  | 2,394 |  |  | 3,014
﻿Permanent differences |  |  | 309 |  |  | 4,505 |  |  | 1,803
﻿Foreign tax credit adjustments |  |  | 2,394 |  |  | — |  |  | —
﻿Increase/(decrease) in valuation allowance |  |  | (58,777) |  |  | (802) |  |  | 47,253
﻿Other |  |  | — |  |  | (12) |  |  | —
﻿Total income tax expense |  | $ | 10,378 |  | $ | 9,248 |  | $ | 14,587
﻿ |  |  |  |  |  |  |  |  |
﻿
Income Tax Years Subject to Examination by Major Tax Jurisdictions |
﻿ |  |
﻿ |  |
﻿Jurisdiction |  | Years
﻿United States |  | 2008-2017
﻿Gabon |  | 2013-2017
﻿

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=96868398&loc=d3e36027-109320 + Details
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