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Quarterly Results of Operations | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results of Operations | QUARTERLY RESULTS OF OPERATIONS (UNAUDITED)
(In thousands, except per share amounts) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2020: |  |  |  |  |  |  |
Operating revenues | $ | 592,703 |  |  | $ | 568,959 |  |  | $ | 590,214 |  |  | $ | 620,302 |
Operating income | 31,066 |  |  | 52,818 |  |  | 62,103 |  |  | 81,451 |
Net income | 23,058 |  |  | 39,132 |  |  | 46,332 |  |  | 60,556 |
Basic earnings per share | 0.33 |  |  | 0.57 |  |  | 0.67 |  |  | 0.88 |
Diluted earnings per share | 0.33 |  |  | 0.56 |  |  | 0.67 |  |  | 0.88 |
(In thousands, except per share amounts) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2019: |  |  |  |  |  |  |
Operating revenues | $ | 596,117 |  |  | $ | 627,533 |  |  | $ | 618,264 |  |  | $ | 621,787 |
Operating income | 48,019 |  |  | 58,442 |  |  | 53,357 |  |  | 65,654 |
Net income | 36,086 |  |  | 43,318 |  |  | 39,044 |  |  | 48,496 |
Basic earnings per share | 0.51 |  |  | 0.62 |  |  | 0.56 |  |  | 0.70 |
Diluted earnings per share | 0.51 |  |  | 0.62 |  |  | 0.56 |  |  | 0.70 |

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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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