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SUPPLEMENTARY DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018 and 2017, are summarized below (in thousands, except per share data).
2018 |  | March 31 (1) |  | June 30 (1) |  | September 30 (1) |  | December 31 (1)
Revenues: |  |  |  |  |  |  |  |
Transportation |  | $ | 3,637,640 |  |  | $ | 3,953,139 |  |  | $ | 4,028,392 |  |  | $ | 3,896,750 |
Sourcing |  | 287,687 |  |  | 322,898 |  |  | 263,508 |  |  | 241,158 |
Total revenues |  | 3,925,327 |  |  | 4,276,037 |  |  | 4,291,900 |  |  | 4,137,908 |
Costs and expenses: |  |  |  |  |  |  |  |
Purchased transportation and related services |  | 3,041,602 |  |  | 3,313,196 |  |  | 3,359,520 |  |  | 3,207,859 |
Purchased products sourced for resale |  | 257,800 |  |  | 291,358 |  |  | 238,336 |  |  | 216,266 |
Personnel expenses |  | 328,297 |  |  | 340,630 |  |  | 335,299 |  |  | 339,316 |
Other selling, general, and administrative expenses |  | 106,043 |  |  | 111,845 |  |  | 112,772 |  |  | 118,950 |
Total costs and expenses |  | 3,733,742 |  |  | 4,057,029 |  |  | 4,045,927 |  |  | 3,882,391 |
Income from operations |  | 191,585 |  |  | 219,008 |  |  | 245,973 |  |  | 255,517 |
Net income |  | $ | 142,297 |  |  | $ | 159,163 |  |  | $ | 175,895 |  |  | $ | 187,150 |
Basic net income per share |  | $ | 1.02 |  |  | $ | 1.14 |  |  | $ | 1.27 |  |  | $ | 1.36 |
Diluted net income per share |  | $ | 1.01 |  |  | $ | 1.13 |  |  | $ | 1.25 |  |  | $ | 1.34 |
Basic weighted average shares outstanding |  | 140,032 |  |  | 139,464 |  |  | 138,797 |  |  | 137,797 |
Dilutive effect of outstanding stock awards |  | 1,238 |  |  | 1,147 |  |  | 1,363 |  |  | 1,385 |
Diluted weighted average shares outstanding |  | 141,270 |  |  | 140,611 |  |  | 140,160 |  |  | 139,182 |
__________________________ (1) The adoption of ASU 2014-09, Revenue from Contracts with Customers, resulted in an increase to our net income of $2.1 million, $6.6 million, $0.5 million, and reduced our net income by $4.2 million for the quarters ended March 31, June 30, September 30, and December 31, respectively, compared to the accounting standards in effect for 2017.
2017 |  | March 31 (1) |  | June 30 |  | September 30 |  | December 31 (2)
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 |
__________________________ (1) Our provision for income taxes decreased in the first quarter of 2017 by $13.7 million due to our adoption of ASU 2016-09, Compensation - Stock Compensation (Topic 718). (2) 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.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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