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Quarterly Data (Unaudited) | 12 Months Ended
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Dec. 31, 2016
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 2016 and 2015:
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |
| (In thousands, except per share amounts)
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 |
2015 |  |  |  |  |  |  |  |
Operating revenues | $ | 860,845 |  | $ | 938,039 |  | $ | 1,198,342 |  | $ | 1,016,826 |
Operating expenses | 810,537 |  | 878,330 |  | 1,070,514 |  | 934,896 |
Operating income | 50,308 |  | 59,709 |  | 127,828 |  | 81,930 |
Income from continuing operations | 20,540 |  | 26,061 |  | 73,886 |  | 55,902 |
Loss from discontinued operations attributable to the Company, net of tax | (326,457 | ) | (255,665 | ) | (213,334 | ) | (3,368 | )
Net income (loss) attributable to the Company | (305,917 | ) | (229,604 | ) | (139,448 | ) | 52,534 |
Earnings (loss) per common share - basic: |  |  |  |  |  |  |  |
Earnings before discontinued operations | .10 |  | .13 |  | .38 |  | .29 |
Discontinued operations attributable to the Company, net of tax | (1.67 | ) | (1.31 | ) | (1.10 | ) | (.02 | )
Earnings (loss) per common share - basic | (1.57 | ) | (1.18 | ) | (.72 | ) | .27 |
Earnings (loss) per common share - diluted: |  |  |  |  |  |  |  |
Earnings before discontinued operations | .10 |  | .13 |  | .38 |  | .29 |
Discontinued operations attributable to the Company, net of tax | (1.67 | ) | (1.31 | ) | (1.10 | ) | (.02 | )
Earnings (loss) per common share - diluted | (1.57 | ) | (1.18 | ) | (.72 | ) | .27 |
Weighted average common shares outstanding: |  |  |  |  |  |  |  |
Basic | 194,479 |  | 194,805 |  | 195,151 |  | 195,266 |
Diluted | 194,566 |  | 194,838 |  | 195,169 |  | 195,324 |
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.
• | 2015 and first quarter 2016 have 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.
• | First quarter 2015 has been recast to present the results of operations of Fidelity as discontinued operations, other than certain general and administrative costs and interest expense which were previously allocated to the former exploration and production segment and do not meet the criteria for income (loss) from discontinued operations.
• | First quarter 2015 reflects a MEPP withdrawal liability of $2.4 million (before tax). For more information, see Note 14.
• | Second quarter 2015 reflects an impairment of coalbed natural gas gathering assets of $3.0 million (before tax). For more information, see Note 1.
• | Third quarter 2015 reflects an impairment of coalbed natural gas gathering assets of $14.1 million (before tax). For more information, see Note 1.
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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