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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |
Summary of Quarterly Financial Information |
(In thousands of dollars except per share information) |  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |
2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues (1) |  | $ | 28,071 |  |  | $ | 52,098 |  |  | $ | 24,486 |  |  | $ | 23,037 |
Total operating costs and expenses |  |  | 28,721 |  |  |  | 18,270 |  |  |  | 17,799 |  |  |  | 117,308 |
Operating income (loss) |  |  | (650 | ) |  |  | 33,828 |  |  |  | 6,687 |  |  |  | (94,270 | )
Net income (loss) |  |  | (7,038 | ) |  |  | 24,712 |  |  |  | 3,109 |  |  |  | (98,332 | )
Basic net income (loss) per share |  | $ | (0.12 | ) |  | $ | 0.43 |  |  | $ | 0.05 |  |  | $ | (1.70 | )
Diluted net income (loss) per share |  | $ | (0.12 | ) |  | $ | 0.43 |  |  | $ | 0.05 |  |  | $ | (1.70 | )
(In thousands of dollars except per share information) |  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |
2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues (1) |  | $ | 44,137 |  |  | $ | 29,118 |  |  | $ | 37,740 |  |  | $ | 58,282 |
Total operating costs and expenses |  |  | 22,634 |  |  |  | 17,452 |  |  |  | 29,636 |  |  |  | 22,331 |
Operating income |  |  | 21,503 |  |  |  | 11,666 |  |  |  | 8,104 |  |  |  | 35,951 |
Net income |  |  | 7,188 |  |  |  | 7,121 |  |  |  | 2,386 |  |  |  | 26,377 |
Basic net income per share |  | $ | 0.12 |  |  | $ | 0.12 |  |  | $ | 0.04 |  |  | $ | 0.46 |
Diluted net income per share |  | $ | 0.12 |  |  | $ | 0.12 |  |  | $ | 0.04 |  |  | $ | 0.46 |
(1) | Gabon crude oil sales are a function of the number and size of crude oil liftings in each quarter from the floating production, storage and offloading (“FPSO”) facility.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=35737889&loc=d3e1280-108306 + Details
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