| QUARTERLY FINANCIAL DATA (UNAUDITED) |
QUARTERLY FINANCIAL DATA (UNAUDITED)
| | | | | | | | | | | | | | | | | | | | First Quarter | | Second Quarter | | Third Quarter | | Fourth Quarter | Year Ended December 31, 2019 | | | | | | | (Thousands of dollars) | Revenues | | $ | 661,000 |
| | $ | 290,560 |
| | $ | 248,563 |
| | $ | 452,607 |
| Operating income | | $ | 127,619 |
| | $ | 46,891 |
| | $ | 38,777 |
| | $ | 81,971 |
| Net income | | $ | 93,660 |
| | $ | 24,470 |
| | $ | 17,457 |
| | $ | 51,162 |
| Earnings per share | | | | | | | | | Basic | | $ | 1.77 |
| | $ | 0.46 |
| | $ | 0.33 |
| | $ | 0.97 |
| Diluted | | $ | 1.76 |
| | $ | 0.46 |
| | $ | 0.33 |
| | $ | 0.96 |
|
| | | | | | | | | | | | | | | | | | | | 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 |
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(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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