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Quarterly Results of Operations (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Results of Operations |
(In thousands, except per share amounts) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2016: |  |  |  |  |  |  |
Operating revenues | $ | 482,802 |  |  | $ | 498,681 |  |  | $ | 508,676 |  |  | $ | 518,832 |
Operating income | 32,487 |  |  | 29,553 |  |  | 29,074 |  |  | 34,956 |
Net income | 20,092 |  |  | 18,306 |  |  | 18,920 |  |  | 21,811 |
Basic earnings per share | 0.28 |  |  | 0.25 |  |  | 0.26 |  |  | 0.30 |
Diluted earnings per share | 0.28 |  |  | 0.25 |  |  | 0.26 |  |  | 0.30 |
(In thousands, except per share amounts) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2015: |  |  |  |  |  |  |
Operating revenues | $ | 495,654 |  |  | $ | 534,644 |  |  | $ | 534,448 |  |  | $ | 528,783 |
Operating income | 38,185 |  |  | 52,210 |  |  | 52,800 |  |  | 57,261 |
Net income | 23,142 |  |  | 31,848 |  |  | 32,076 |  |  | 36,648 |
Basic earnings per share | 0.32 |  |  | 0.44 |  |  | 0.45 |  |  | 0.51 |
Diluted earnings per share | 0.32 |  |  | 0.44 |  |  | 0.44 |  |  | 0.51 |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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