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SUPPLEMENTARY DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 2016 and 2015, are summarized below (in thousands, except per share data).
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 |
2015 |  | March 31 |  | June 30 |  | September 30 |  | December 31
Revenues: |  |  |  |  |  |  |  |
Transportation |  | $ | 2,947,257 |  |  | $ | 3,130,722 |  |  | $ | 3,044,500 |  |  | $ | 2,867,301 |
Sourcing |  | 353,633 |  |  | 414,366 |  |  | 374,753 |  |  | 343,552 |
Total revenues |  | 3,300,890 |  |  | 3,545,088 |  |  | 3,419,253 |  |  | 3,210,853 |
Costs and expenses: |  |  |  |  |  |  |  |
Purchased transportation and related services |  | 2,452,112 |  |  | 2,582,374 |  |  | 2,484,409 |  |  | 2,323,376 |
Purchased products sourced for resale |  | 323,668 |  |  | 378,696 |  |  | 346,269 |  |  | 316,700 |
Personnel expenses |  | 255,144 |  |  | 263,999 |  |  | 264,077 |  |  | 268,190 |
Other selling, general, and administrative expenses |  | 88,041 |  |  | 90,924 |  |  | 91,787 |  |  | 88,008 |
Total costs and expenses |  | 3,118,965 |  |  | 3,315,993 |  |  | 3,186,542 |  |  | 2,996,274 |
Income from operations |  | 181,925 |  |  | 229,095 |  |  | 232,711 |  |  | 214,579 |
Net income |  | $ | 106,476 |  |  | $ | 137,208 |  |  | $ | 139,432 |  |  | $ | 126,583 |
Basic net income per share |  | $ | 0.73 |  |  | $ | 0.94 |  |  | $ | 0.96 |  |  | $ | 0.88 |
Diluted net income per share |  | $ | 0.73 |  |  | $ | 0.94 |  |  | $ | 0.96 |  |  | $ | 0.88 |
Basic weighted average shares outstanding |  | 146,204 |  |  | 145,515 |  |  | 144,578 |  |  | 143,484 |
Dilutive effect of outstanding stock awards |  | 179 |  |  | 164 |  |  | 204 |  |  | 660 |
Diluted weighted average shares outstanding |  | 146,383 |  |  | 145,679 |  |  | 144,782 |  |  | 144,144 |
Market price range of common stock: |  |  |  |  |  |  |  |
High |  | $ | 76.18 |  |  | $ | 73.09 |  |  | $ | 71.50 |  |  | $ | 73.34 |
Low |  | $ | 67.11 |  |  | $ | 61.46 |  |  | $ | 61.64 |  |  | $ | 59.71 |

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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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