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Quarterly Financial Information | 12 Months Ended
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Dec. 31, 2015
Selected Quarterly Financial Information [Abstract] |
Quarterly Financial Information | Note 9. Quarterly Financial Information (Unaudited) A summary of our unaudited quarterly financial information for 2015 and 2014 is provided below. Our tonnage levels and revenue mix are subject to seasonal trends common in the motor carrier industry. Financial results in the first quarter are normally lower due to reduced shipments during the winter months. Harsh winter weather can also adversely impact our performance by reducing demand and increasing operating expenses.
|  | Quarter
(In thousands, except per share data) |  | First |  | Second |  | Third |  | Fourth |  | Total
2015 |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 696,245 |  |  | $ | 762,151 |  |  | $ | 779,474 |  |  | $ | 734,572 |  |  | $ | 2,972,442 |
Operating income |  | 103,565 |  |  | 140,899 |  |  | 139,854 |  |  | 113,922 |  |  | 498,240 |
Net income |  | 62,524 |  |  | 85,574 |  |  | 84,368 |  |  | 72,224 |  |  | 304,690 |
Earnings per share: |  |  |  |  |  |  |  |  |  |
Basic and diluted |  | 0.73 |  |  | 1.00 |  |  | 0.99 |  |  | 0.85 |  |  | 3.57 |
2014 |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 620,276 |  |  | $ | 702,987 |  |  | $ | 743,586 |  |  | $ | 721,048 |  |  | $ | 2,787,897 |
Operating income |  | 80,052 |  |  | 122,695 |  |  | 126,262 |  |  | 112,298 |  |  | 441,307 |
Net income |  | 45,887 |  |  | 73,849 |  |  | 77,909 |  |  | 69,869 |  |  | 267,514 |
Earnings per share: |  |  |  |  |  |  |  |  |  |
Basic and diluted |  | 0.53 |  |  | 0.86 |  |  | 0.90 |  |  | 0.81 |  |  | 3.10 |

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 2: 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=51825399&loc=d3e1280-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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