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Quarterly data | 12 Months Ended
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Dec. 31, 2017
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 2017 and 2016:
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |
| (In thousands, except per share amounts)
2017 |  |  |  |
Operating revenues | $ | 937,925 |  | $ | 1,067,639 |  | $ | 1,272,548 |  | $ | 1,165,239 |
Operating expenses | 870,813 |  | 987,960 |  | 1,116,171 |  | 1,039,695 |
Operating income | 67,112 |  | 79,679 |  | 156,377 |  | 125,544 |
Income from continuing operations | 35,638 |  | 44,405 |  | 89,549 |  | 115,394 |
Income (loss) from discontinued operations attributable to the Company, net of tax | 1,687 |  | (3,190 | ) | (2,198 | ) | (82 | )
Net income attributable to the Company | 37,325 |  | 41,215 |  | 87,351 |  | 115,312 |
Earnings per common share - basic: |  |  |  |  |  |  |
Earnings before discontinued operations | .18 |  | .22 |  | .46 |  | .59 |
Discontinued operations attributable to the Company, 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 attributable to the Company, 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 |
2016 |  |  |  |  |  |  |  |
Operating revenues | $ | 860,214 |  | $ | 1,043,948 |  | $ | 1,208,567 |  | $ | 1,016,099 |
Operating expenses | 798,229 |  | 954,983 |  | 1,061,883 |  | 904,613 |
Operating income | 61,985 |  | 88,965 |  | 146,684 |  | 111,486 |
Income from continuing operations | 31,865 |  | 46,298 |  | 88,386 |  | 66,547 |
Loss from discontinued operations attributable to the Company, net of tax | (6,996 | ) | (155,451 | ) | (5,400 | ) | (816 | )
Net income (loss) attributable to the Company | 24,869 |  | (109,153 | ) | 82,986 |  | 65,731 |
Earnings (loss) per common share - basic: |  |  |  |  |  |  |  |
Earnings before discontinued operations | .16 |  | .24 |  | .45 |  | .34 |
Discontinued operations attributable to the Company, net of tax | (.03 | ) | (.80 | ) | (.03 | ) | — |
Earnings (loss) per common share - basic | .13 |  | (.56 | ) | .42 |  | .34 |
Earnings (loss) per common share - diluted: |  |  |  |  |  |  |  |
Earnings before discontinued operations | .16 |  | .24 |  | .45 |  | .33 |
Discontinued operations attributable to the Company, net of tax | (.03 | ) | (.80 | ) | (.03 | ) | — |
Earnings (loss) per common share - diluted | .13 |  | (.56 | ) | .42 |  | .33 |
Weighted average common shares outstanding: |  |  |  |  |  |  |  |
Basic | 195,284 |  | 195,304 |  | 195,304 |  | 195,304 |
Diluted | 195,284 |  | 195,699 |  | 195,811 |  | 195,889 |
Notes:
• | Fourth quarter 2016 reflects a reduction to a previously recorded MEPP withdrawal liability of $11.1 million (before tax). For more information, see Note 14.
• | First quarter 2016 has been recast to present the results of operations of Dakota Prairie Refining as discontinued operations, other than certain general and administrative costs and interest expense which were previously allocated to the former refining segment and do not meet the criteria for income (loss) from discontinued operations.
• | Fourth quarter 2017 reflects an income tax benefit of $39.5 million related to the TCJA. For more information, see Note 11.
Certain Company operations 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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