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Quarterly Financial Information | 12 Months Ended
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Dec. 31, 2016
Selected Quarterly Financial Information [Abstract] |
Quarterly Financial Information | Note 10. Quarterly Financial Information (Unaudited) A summary of our unaudited quarterly financial information for 2016 and 2015 is provided below. Our tonnage levels and revenue mix are subject to seasonal trends common in the motor carrier industry. Our revenue and operating margins in the first and fourth quarters are typically lower than those during the second and third quarters due to reduced shipments during the winter months. Harsh winter weather or natural disasters, such as hurricanes, tornadoes and floods, 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
2016 |  |  |  |  |  |  |  |  |  |
Revenue |  | $ | 707,733 |  |  | $ | 755,435 |  |  | $ | 782,611 |  |  | $ | 745,738 |  |  | $ | 2,991,517 |
Operating income |  | 99,548 |  |  | 133,436 |  |  | 137,404 |  |  | 113,447 |  |  | 483,835 |
Net income |  | 60,285 |  |  | 81,388 |  |  | 85,581 |  |  | 68,511 |  |  | 295,765 |
Earnings per share: |  |  |  |  |  |  |  |  |  |
Basic |  | 0.72 |  |  | 0.98 |  |  | 1.03 |  |  | 0.83 |  |  | 3.56 |
Diluted |  | 0.72 |  |  | 0.98 |  |  | 1.03 |  |  | 0.83 |  |  | 3.56 |
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 |  | 0.73 |  |  | 1.00 |  |  | 0.99 |  |  | 0.85 |  |  | 3.57 |
Diluted |  | 0.73 |  |  | 1.00 |  |  | 0.99 |  |  | 0.85 |  |  | 3.57 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: 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=68064558&loc=d3e765-108305 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=68064558&loc=d3e725-108305 + Details
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