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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data (Unaudited) |
Schedule of Quarterly Financial Data (Unaudited) |
|  | Year ended December 31, 2018 |
|  | First |  | Second |  | Third |  | Fourth |  |  |  |
|  | Quarter |  | Quarter |  | Quarter |  | Quarter |  | Year |
Operating revenues |  | $ | 783,400 |  | $ | 805,515 |  | $ | 829,275 |  | $ | 803,489 |  | $ | 3,221,679 |
Operating income |  |  | 88,175 |  |  | 126,678 |  |  | 137,925 |  |  | 121,502 |  |  | 474,280 |
Net income |  |  | 54,362 |  |  | 75,859 |  |  | 83,046 |  |  | 67,105 |  |  | 280,372 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 1.05 |  |  | 1.46 |  |  | 1.60 |  |  | 1.30 |  |  | 5.40 |
Diluted |  |  | 1.03 |  |  | 1.43 |  |  | 1.57 |  |  | 1.28 |  |  | 5.30 |
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  | 51,921 |  |  | 52,046 |  |  | 52,039 |  |  | 51,650 |  |  | 51,914 |
Diluted: |  |  | 53,033 |  |  | 52,913 |  |  | 52,981 |  |  | 52,556 |  |  | 52,871 |
|  | Year ended December 31, 2017 |
|  | First |  | Second |  | Third |  | Fourth |  |  |  |
|  | Quarter |  | Quarter |  | Quarter |  | Quarter |  | Year |
Operating revenues |  | $ | 747,166 |  | $ | 791,512 |  | $ | 812,673 |  | $ | 771,241 |  | $ | 3,122,592 |
Operating income |  |  | 76,295 |  |  | 106,596 |  |  | 112,369 |  |  | 92,939 |  |  | 388,199 |
Net income (1) |  |  | 34,786 |  |  | 50,477 |  |  | 53,716 |  |  | 289,928 |  |  | 428,907 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 0.67 |  |  | 0.98 |  |  | 1.04 |  |  | 5.60 |  |  | 8.28 |
Diluted |  |  | 0.65 |  |  | 0.95 |  |  | 1.01 |  |  | 5.46 |  |  | 8.08 |
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic: |  |  | 51,820 |  |  | 51,751 |  |  | 51,833 |  |  | 51,811 |  |  | 51,804 |
Diluted: |  |  | 53,202 |  |  | 52,977 |  |  | 53,080 |  |  | 53,140 |  |  | 53,100 |
Net income for 2017 included a $246.8 million benefit related to the revaluation of the Company’s deferred tax liability and other tax liabilities in accordance with the Tax Act.

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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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