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SUPPLEMENTARY DATA (UNAUDITED) - Summary of Unaudited Results of Operations for Each Quarter (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues: |  |  |  |  |  |  |  |  |  |  |
Transportation | $ 3,647,167 | $ 3,433,701 | $ 3,319,995 | $ 3,102,043 | $ 3,110,978 | $ 2,998,583 | $ 2,881,496 | $ 2,713,688 | $ 13,502,906 | $ 11,704,745 | $ 11,989,780
Sourcing | 312,619 | 350,750 | 390,023 | 313,082 | 303,997 | 357,171 | 418,245 | 360,255 | 1,366,474 | 1,439,668 | 1,486,304
Total revenues | 3,959,786 | 3,784,451 | 3,710,018 | 3,415,125 | 3,414,975 | 3,355,754 | 3,299,741 | 3,073,943 | 14,869,380 | 13,144,413 | 13,476,084
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Purchased transportation and related services | 3,042,434 | 2,869,616 | 2,781,355 | 2,563,885 | 2,575,378 | 2,469,939 | 2,324,995 | 2,179,622 | 11,257,290 | 9,549,934 | 9,842,271
Purchased products sourced for resale | 285,503 | 320,989 | 354,874 | 282,674 | 278,081 | 327,353 | 380,531 | 330,986 | 1,244,040 | 1,316,951 | 1,365,333
Personnel expenses | 311,599 | 293,204 | 284,220 | 290,504 | 260,305 | 256,883 | 270,251 | 277,497 | 1,179,527 | 1,064,936 | 1,051,410
Other selling, general, and administrative expenses | 109,374 | 106,177 | 107,749 | 90,104 | 107,646 | 90,312 | 90,217 | 86,886 | 413,404 | 375,061 | 358,760
Total costs and expenses | 3,748,910 | 3,589,986 | 3,528,198 | 3,227,167 | 3,221,410 | 3,144,487 | 3,065,994 | 2,874,991 | 14,094,261 | 12,306,882 | 12,617,774
Income from operations | 210,876 | 194,465 | 181,820 | 187,958 | 193,565 | 211,267 | 233,747 | 198,952 | 775,119 | 837,531 | 858,310
Net income | $ 152,556 | $ 119,186 | $ 111,071 | $ 122,080 | $ 122,303 | $ 129,028 | $ 143,090 | $ 118,963 | $ 504,893 | $ 513,384 | $ 509,699
Basic net income per share (in dollars per share) | $ 1.09 | $ 0.85 | $ 0.79 | $ 0.86 | $ 0.86 | $ 0.90 | $ 1.00 | $ 0.83 | $ 3.59 | $ 3.60 | $ 3.52
Diluted net income per share (in dollars per share) | $ 1.08 | $ 0.85 | $ 0.78 | $ 0.86 | $ 0.86 | $ 0.90 | $ 1.00 | $ 0.83 | $ 3.57 | $ 3.59 | $ 3.51
Basic weighted average shares outstanding (in shares) | 139,572 | 140,422 | 141,061 | 141,484 | 141,711 | 142,611 | 142,998 | 143,525 | 140,610 | 142,706 | 144,967
Dilutive effect of outstanding stock awards (in shares) | 1,152 | 600 | 526 | 374 | 453 | 272 | 218 | 133 | 772 | 285 | 382
Diluted weighted average shares outstanding (in shares) | 140,724 | 141,022 | 141,587 | 141,858 | 142,164 | 142,883 | 143,216 | 143,658 | 141,382 | 142,991 | 145,349
Market price range of common stock: |  |  |  |  |  |  |  |  |  |  |
High (in dollars per share) | $ 89.89 | $ 76.16 | $ 78.31 | $ 81.16 | $ 77.89 | $ 75.69 | $ 76.10 | $ 75.11 |  |  |
Low (in dollars per share) | $ 74.30 | $ 63.41 | $ 66.33 | $ 72.17 | $ 65.57 | $ 66.62 | $ 69.84 | $ 60.31 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  |  |  |  |  |  | $ 223,570 | $ 298,566 | $ 313,082
Tax benefit for qualified production activity |  |  |  |  |  |  |  |  | 19,700 |  |
Tax Cuts and Jobs Act of 2017, Provisional income tax benefit |  |  |  |  |  |  |  |  | 12,100 |  |
Accounting Standards Update 2016-09 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Provision for income taxes |  |  |  |  |  |  |  |  | $ 13,700 |  |

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