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SUPPLEMENTARY DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Our unaudited results of operations for each of the quarters in the years ended December 31, 2017 and 2016, are summarized below (in thousands, except per share data).
2017 |  | March 31 (a) |  | June 30 |  | September 30 |  | December 31 (b)
Revenues: |  |  |  |  |  |  |  |
Transportation |  | $ | 3,102,043 |  |  | $ | 3,319,995 |  |  | $ | 3,433,701 |  |  | $ | 3,647,167 |
Sourcing |  | 313,082 |  |  | 390,023 |  |  | 350,750 |  |  | 312,619 |
Total revenues |  | 3,415,125 |  |  | 3,710,018 |  |  | 3,784,451 |  |  | 3,959,786 |
Costs and expenses: |  |  |  |  |  |  |  |
Purchased transportation and related services |  | 2,563,885 |  |  | 2,781,355 |  |  | 2,869,616 |  |  | 3,042,434 |
Purchased products sourced for resale |  | 282,674 |  |  | 354,874 |  |  | 320,989 |  |  | 285,503 |
Personnel expenses |  | 290,504 |  |  | 284,220 |  |  | 293,204 |  |  | 311,599 |
Other selling, general, and administrative expenses |  | 90,104 |  |  | 107,749 |  |  | 106,177 |  |  | 109,374 |
Total costs and expenses |  | 3,227,167 |  |  | 3,528,198 |  |  | 3,589,986 |  |  | 3,748,910 |
Income from operations |  | 187,958 |  |  | 181,820 |  |  | 194,465 |  |  | 210,876 |
Net income |  | $ | 122,080 |  |  | $ | 111,071 |  |  | $ | 119,186 |  |  | $ | 152,556 |
Basic net income per share |  | $ | 0.86 |  |  | $ | 0.79 |  |  | $ | 0.85 |  |  | $ | 1.09 |
Diluted net income per share |  | $ | 0.86 |  |  | $ | 0.78 |  |  | $ | 0.85 |  |  | $ | 1.08 |
Basic weighted average shares outstanding |  | 141,484 |  |  | 141,061 |  |  | 140,422 |  |  | 139,572 |
Dilutive effect of outstanding stock awards |  | 374 |  |  | 526 |  |  | 600 |  |  | 1,152 |
Diluted weighted average shares outstanding |  | 141,858 |  |  | 141,587 |  |  | 141,022 |  |  | 140,724 |
Market price range of common stock: |  |  |  |  |  |  |  |
High |  | $ | 81.16 |  |  | $ | 78.31 |  |  | $ | 76.16 |  |  | $ | 89.89 |
Low |  | $ | 72.17 |  |  | $ | 66.33 |  |  | $ | 63.41 |  |  | $ | 74.30 |
__________________________ (a) Our provision for income taxes decreased in the first quarter of 2017 by $13.7 million due to our adoption of ASU 2016-09. (b) Our provision for income taxes decreased in the fourth quarter by $19.7 million due to the benefit of deductions under section 199 of the Internal Revenue Code and $12.1 million due to the impact of the Tax Act.
2016 |  | March 31 |  | June 30 |  | September 30 |  | December 31
Revenues: |  |  |  |  |  |  |  |
Transportation |  | $ | 2,713,688 |  |  | $ | 2,881,496 |  |  | $ | 2,998,583 |  |  | $ | 3,110,978 |
Sourcing |  | 360,255 |  |  | 418,245 |  |  | 357,171 |  |  | 303,997 |
Total revenues |  | 3,073,943 |  |  | 3,299,741 |  |  | 3,355,754 |  |  | 3,414,975 |
Costs and expenses: |  |  |  |  |  |  |  |
Purchased transportation and related services |  | 2,179,622 |  |  | 2,324,995 |  |  | 2,469,939 |  |  | 2,575,378 |
Purchased products sourced for resale |  | 330,986 |  |  | 380,531 |  |  | 327,353 |  |  | 278,081 |
Personnel expenses |  | 277,497 |  |  | 270,251 |  |  | 256,883 |  |  | 260,305 |
Other selling, general, and administrative expenses |  | 86,886 |  |  | 90,217 |  |  | 90,312 |  |  | 107,646 |
Total costs and expenses |  | 2,874,991 |  |  | 3,065,994 |  |  | 3,144,487 |  |  | 3,221,410 |
Income from operations |  | 198,952 |  |  | 233,747 |  |  | 211,267 |  |  | 193,565 |
Net income |  | $ | 118,963 |  |  | $ | 143,090 |  |  | $ | 129,028 |  |  | $ | 122,303 |
Basic net income per share |  | $ | 0.83 |  |  | $ | 1.00 |  |  | $ | 0.90 |  |  | $ | 0.86 |
Diluted net income per share |  | $ | 0.83 |  |  | $ | 1.00 |  |  | $ | 0.90 |  |  | $ | 0.86 |
Basic weighted average shares outstanding |  | 143,525 |  |  | 142,998 |  |  | 142,611 |  |  | 141,711 |
Dilutive effect of outstanding stock awards |  | 133 |  |  | 218 |  |  | 272 |  |  | 453 |
Diluted weighted average shares outstanding |  | 143,658 |  |  | 143,216 |  |  | 142,883 |  |  | 142,164 |
Market price range of common stock: |  |  |  |  |  |  |  |
High |  | $ | 75.11 |  |  | $ | 76.10 |  |  | $ | 75.69 |  |  | $ | 77.89 |
Low |  | $ | 60.31 |  |  | $ | 69.84 |  |  | $ | 66.62 |  |  | $ | 65.57 |

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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=84173487&loc=d3e1280-108306 + Details
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