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Quarterly data (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial data | The following unaudited information shows selected items by quarter for the years 2018 and 2017:
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |
| (In thousands, except per share amounts)
2018 |  |  |  |
Operating revenues | $ | 976,293 |  | $ | 1,064,597 |  | $ | 1,280,787 |  | $ | 1,209,875 |
Operating expenses | 906,917 |  | 990,605 |  | 1,140,783 |  | 1,091,524 |
Operating income | 69,376 |  | 73,992 |  | 140,004 |  | 118,351 |
Income from continuing operations | 41,960 |  | 44,075 |  | 107,369 |  | 75,982 |
Income (loss) from discontinued operations, net of tax | 477 |  | (273 | ) | (118 | ) | 2,846 |
Net income | 42,437 |  | 43,802 |  | 107,251 |  | 78,828 |
Earnings per common share - basic: |  |  |  |  |  |  |
Earnings before discontinued operations | .22 |  | .22 |  | .55 |  | .39 |
Discontinued operations, net of tax | — |  | — |  | — |  | .01 |
Earnings per common share - basic | .22 |  | .22 |  | .55 |  | .40 |
Earnings per common share - diluted: |  |  |  |  |  |  |
Earnings before discontinued operations | .22 |  | .22 |  | .55 |  | .39 |
Discontinued operations, net of tax | — |  | — |  | — |  | .01 |
Earnings per common share - diluted | .22 |  | .22 |  | .55 |  | .40 |
Weighted average common shares outstanding: |  |  |  |  |  |  |
Basic | 195,304 |  | 195,524 |  | 196,018 |  | 196,023 |
Diluted | 195,982 |  | 196,169 |  | 196,265 |  | 196,385 |
2017 |  |  |  |  |  |  |  |
Operating revenues | $ | 937,925 |  | $ | 1,067,639 |  | $ | 1,272,548 |  | $ | 1,165,239 |
Operating expenses | 872,139 |  | 988,979 |  | 1,117,228 |  | 1,040,957 |
Operating income | 65,786 |  | 78,660 |  | 155,320 |  | 124,282 |
Income from continuing operations | 35,638 |  | 44,405 |  | 89,549 |  | 115,394 |
Income (loss) from discontinued operations, net of tax | 1,687 |  | (3,190 | ) | (2,198 | ) | (82 | )
Net income | 37,325 |  | 41,215 |  | 87,351 |  | 115,312 |
Earnings per common share - basic: |  |  |  |  |  |  |  |
Earnings before discontinued operations | .18 |  | .22 |  | .46 |  | .59 |
Discontinued operations, net of tax | .01 |  | (.01 | ) | (.01 | ) | — |
Earnings per common share - basic | .19 |  | .21 |  | .45 |  | .59 |
Earnings per common share - diluted: |  |  |  |  |  |  |  |
Earnings before discontinued operations | .18 |  | .22 |  | .46 |  | .59 |
Discontinued operations, net of tax | .01 |  | (.01 | ) | (.01 | ) | — |
Earnings per common share - diluted | .19 |  | .21 |  | .45 |  | .59 |
Weighted average common shares outstanding: |  |  |  |  |  |  |  |
Basic | 195,304 |  | 195,304 |  | 195,304 |  | 195,304 |
Diluted | 196,023 |  | 195,973 |  | 195,783 |  | 195,617 |
Notes:
• | Fourth quarter 2017 reflects an income tax benefit of $39.5 million related to the TCJA. For more information, see Note 13.

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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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