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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2018
Schedule of Quarterly Financial Information [Line Items] |
Quarterly Financial Data |
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Year Ended December 31, 2018 |  |  |  |
|  | (Thousands of dollars)
Revenues |  | $ | 638,464 |  |  | $ | 292,521 |  |  | $ | 238,280 |  |  | $ | 464,466 |
Operating income (a) |  | $ | 130,290 |  |  | $ | 41,043 |  |  | $ | 36,241 |  |  | $ | 80,855 |
Net income |  | $ | 90,835 |  |  | $ | 20,419 |  |  | $ | 16,276 |  |  | $ | 44,704 |
Earnings per share |  |  |  |  |  |  |  |
Basic |  | $ | 1.73 |  |  | $ | 0.39 |  |  | $ | 0.31 |  |  | $ | 0.85 |
Diluted |  | $ | 1.72 |  |  | $ | 0.39 |  |  | $ | 0.31 |  |  | $ | 0.84 |
(a) Reflects the impact of the adoption of a new accounting standard in fiscal year 2018 related to the presentation of net periodic benefit costs. See Note 1 for additional information regarding our adoption of this standard.
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Year Ended December 31, 2017 |  |  |  |
|  | (Thousands of dollars)
Revenues |  | $ | 550,408 |  |  | $ | 279,689 |  |  | $ | 247,142 |  |  | $ | 462,394 |
Operating income (a) |  | $ | 129,445 |  |  | $ | 48,365 |  |  | $ | 45,093 |  |  | $ | 93,825 |
Net income |  | $ | 76,456 |  |  | $ | 20,623 |  |  | $ | 18,797 |  |  | $ | 47,119 |
Earnings per share |  |  |  |  |  |  |  |
Basic |  | $ | 1.45 |  |  | $ | 0.39 |  |  | $ | 0.36 |  |  | $ | 0.90 |
Diluted |  | $ | 1.44 |  |  | $ | 0.39 |  |  | $ | 0.36 |  |  | $ | 0.89 |
(a) Reflects the impact of the adoption of a new accounting standard in fiscal year 2018 related to the presentation of net periodic benefit costs. See Note 1 for additional information regarding our adoption of this standard.

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- Definition [Line Items] for Schedule of Quarterly Financial Information [Table] + References No definition available. + Details
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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=109225645&loc=d3e1280-108306 + Details
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