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SUPPLEMENTARY DATA (UNAUDITED) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
SUPPLEMENTARY DATA (UNAUDITED) | SUPPLEMENTARY DATA (UNAUDITED) 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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