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Selected Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Selected Quarterly Financial Information [Abstract] |
Summary of Quarterly Financial Information |
|  | Three Months Ended
|  | March 31, |  | June 30, |  | September 30, |  | December 31,
|  | (in thousands of dollars except per share information)
2019: |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 19,765 |  | $ | 25,230 |  | $ | 17,603 |  | $ | 21,923
Total operating costs and expenses |  |  | 14,182 |  |  | 14,461 |  |  | 16,137 |  |  | 14,127
Operating income |  |  | 5,546 |  |  | 6,370 |  |  | 1,501 |  |  | 7,776
Income (loss) from continuing operations |  |  | 830 |  |  | (871) |  |  | (3,858) |  |  | 1,051
Income (loss) from discontinued operations |  |  | 5,671 |  |  | (162) |  |  | (61) |  |  | (37)
Net income (loss) |  |  | 6,501 |  |  | (1,033) |  |  | (3,919) |  |  | 1,014
Basic net income (loss) per share |  | $ | 0.10 |  | $ | (0.01) |  | $ | (0.07) |  | $ | 0.02
Diluted net income (loss) per share |  | $ | 0.10 |  | $ | (0.01) |  | $ | (0.07) |  | $ | 0.02
Basic income (loss) from continuing operations per share |  | $ | 0.01 |  | $ | (0.01) |  | $ | (0.07) |  | $ | 0.02
Diluted income (loss) from continuing operations per share |  | $ | 0.01 |  | $ | (0.01) |  | $ | (0.07) |  | $ | 0.02
Deferred income tax expense (benefit) for the three months ended September 30, 2019 included a $4.8 million charge to increase the valuation allowances on US deferred tax assets and for the three months ended December 31, 2019 included $1.7 million benefit as a result of a decrease in valuation allowances on deferred tax assets.
|  | Three Months Ended
|  | March 31, |  | June 30, |  | September 30, |  | December 31,
|  | (in thousands of dollars except per share information)
2018: |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  | $ | 27,645 |  | $ | 24,426 |  | $ | 25,266 |  | $ | 27,606
Total operating costs and expenses |  |  | 14,631 |  |  | 19,017 |  |  | 7,940 |  |  | 12,433
Operating income |  |  | 13,038 |  |  | 5,723 |  |  | 17,320 |  |  | 15,206
Income from continuing operations |  |  | 8,711 |  |  | 887 |  |  | 78,626 |  |  | 10,504
Loss from discontinued operations |  |  | (52) |  |  | (343) |  |  | (21) |  |  | (80)
Net income |  |  | 8,659 |  |  | 544 |  |  | 78,605 |  |  | 10,424
Basic net income per share |  | $ | 0.15 |  | $ | 0.02 |  | $ | 1.31 |  | $ | 0.17
Diluted net income per share |  | $ | 0.15 |  | $ | 0.02 |  | $ | 1.28 |  | $ | 0.17
Basic income from continuing operations per share |  | $ | 0.15 |  | $ | 0.02 |  | $ | 1.31 |  | $ | 0.17
Diluted income from continuing operations per share |  | $ | 0.15 |  | $ | 0.02 |  | $ | 1.28 |  | $ | 0.17
As discussed further in Note 8, deferred income tax expense (benefit) for the three months ended September 30 and December 31, 2018 included $(66.6) million and $9.0 million, respectively, related to the recognition of deferred tax assets as well as adjustments to valuation allowances.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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