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Quarterly data | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Supplementary financial Information-quarterly data (Unaudited) | Supplementary Financial Information Quarterly Data (Unaudited) 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.
Certain operations of the Company are highly seasonal and revenues from and certain expenses for such operations may fluctuate significantly among quarterly periods. Accordingly, quarterly financial information may not be indicative of results for a full year.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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