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Business Segments (Tables) | 12 Months Ended
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Dec. 31, 2017
Segment Reporting [Abstract] |
Summary of Operating Results | The following is a summary of operating results for our business segments for the years ended December 31, 2017, 2016 and 2015 (in thousands):
| Twelve Months |  |  | Twelve Months |
| Ended December 31, 2017 |  |  | Ended December 31, 2016 |
|  |  |  |  |  |  | Inter- |  | Hub |  |  |  |  |  |  |  |  | Inter- |  | Hub |
|  |  |  |  |  |  | Segment |  | Group |  |  |  |  |  |  |  |  | Segment |  | Group |
| Hub |  | Mode |  | Elims |  | Total |  |  | Hub |  | Mode |  | Elims |  | Total |
Revenue | $ | 3,107,394 |  | $ | 1,029,160 |  | $ | (101,657 | ) | $ | 4,034,897 |  |  | $ | 2,734,541 |  | $ | 948,735 |  | $ | (110,486 | ) | $ | 3,572,790 |
Transportation costs |  | 2,771,291 |  |  | 907,746 |  |  | (101,657 | ) |  | 3,577,380 |  |  |  | 2,404,946 |  |  | 823,545 |  |  | (110,486 | ) |  | 3,118,005 |
Gross margin |  | 336,103 |  |  | 121,414 |  |  | - |  |  | 457,517 |  |  |  | 329,595 |  |  | 125,190 |  |  | - |  |  | 454,785 |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Salaries and benefits |  | 174,573 |  |  | 13,816 |  |  | - |  |  | 188,389 |  |  |  | 165,136 |  |  | 15,323 |  |  | - |  |  | 180,459 |
Agent fees and commissions |  | 58 |  |  | 74,024 |  |  | - |  |  | 74,082 |  |  |  | 66 |  |  | 72,830 |  |  | - |  |  | 72,896 |
General and administrative |  | 77,085 |  |  | 8,097 |  |  | - |  |  | 85,182 |  |  |  | 60,811 |  |  | 7,819 |  |  | - |  |  | 68,630 |
Depreciation and amortization |  | 12,139 |  |  | 1,174 |  |  | - |  |  | 13,313 |  |  |  | 7,698 |  |  | 1,268 |  |  | - |  |  | 8,966 |
Total costs and expenses |  | 263,855 |  |  | 97,111 |  |  | - |  |  | 360,966 |  |  |  | 233,711 |  |  | 97,240 |  |  | - |  |  | 330,951 |
Operating income | $ | 72,248 |  | $ | 24,303 |  | $ | - |  | $ | 96,551 |  |  |  | 95,884 |  |  | 27,950 |  |  | - |  |  | 123,834 |
Capital expenditures | $ | 73,772 |  | $ | 769 |  | $ | - |  | $ | 74,541 |  |  | $ | 106,316 |  | $ | 1,093 |  | $ | - |  | $ | 107,409 |
| Twelve Months |
| Ended December 31, 2015 |
|  |  |  |  |  |  | Inter- |  | Hub |
|  |  |  |  |  |  | Segment |  | Group |
| Hub |  | Mode |  | Elims |  | Total |
Revenue | $ | 2,679,318 |  | $ | 928,661 |  | $ | (82,384 | ) | $ | 3,525,595 |
Transportation costs |  | 2,385,197 |  |  | 810,087 |  |  | (82,384 | ) |  | 3,112,900 |
Gross margin |  | 294,121 |  |  | 118,574 |  |  | - |  |  | 412,695 |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Salaries and benefits |  | 143,993 |  |  | 14,945 |  |  | - |  |  | 158,938 |
Agent fees and commissions |  | 56 |  |  | 68,668 |  |  | - |  |  | 68,724 |
General and administrative |  | 53,023 |  |  | 6,992 |  |  | - |  |  | 60,015 |
Depreciation and amortization |  | 6,688 |  |  | 1,300 |  |  | - |  |  | 7,988 |
Total costs and expenses |  | 203,760 |  |  | 91,905 |  |  | - |  |  | 295,665 |
Operating income | $ | 90,361 |  | $ | 26,669 |  | $ | - |  | $ | 117,030 |
Capital expenditures | $ | 79,860 |  | $ | 3,182 |  | $ | - |  | $ | 83,042 |
Schedule of Assets |
| As of December 31, 2017 |  |  | As of December 31, 2016 |
|  |  |  |  |  |  | Inter- |  | Hub |  |  |  |  |  |  |  |  | Inter- |  | Hub |
|  |  |  |  |  |  | Segment |  | Group |  |  |  |  |  |  |  |  | Segment |  | Group |
| Hub |  | Mode |  | Elims |  | Total |  |  | Hub |  | Mode |  | Elims |  | Total |
Total assets | $ | 1,470,792 |  | $ | 210,088 |  | $ | (9,939 | ) | $ | 1,670,941 |  |  | $ | 1,178,110 |  | $ | 191,374 |  | $ | (9,225 | ) | $ | 1,360,259 |
Goodwill | $ | 319,272 |  | $ | 29,389 |  | $ | - |  |  | 348,661 |  |  | $ | 232,987 |  | $ | 29,389 |  | $ | - |  |  | 262,376 |
Summary of Revenue by Segment and Business Line | The following tables summarize our revenue by segment and business line (in thousands):
| Twelve Months |  |  | Twelve Months |
| Ended December 31, 2017 |  |  | Ended December 31, 2016 |
|  |  |  |  |  |  | Inter- |  | Hub |  |  |  |  |  |  |  |  | Inter- |  | Hub |
|  |  |  |  |  |  | Segment |  | Group |  |  |  |  |  |  |  |  | Segment |  | Group |
| Hub |  | Mode |  | Elims |  | Total |  |  | Hub |  | Mode |  | Elims |  | Total |
Intermodal | $ | 1,852,884 |  | $ | 496,733 |  | $ | (56,587 | ) | $ | 2,293,030 |  |  | $ | 1,785,865 |  | $ | 486,758 |  | $ | (81,556 | ) | $ | 2,191,067 |
Truck brokerage |  | 483,955 |  |  | 340,330 |  |  | (1,990 | ) |  | 822,295 |  |  |  | 391,901 |  |  | 308,055 |  |  | (1,456 | ) |  | 698,500 |
Logistics |  | 655,543 |  |  | 192,097 |  |  | (43,061 | ) |  | 804,579 |  |  |  | 556,775 |  |  | 153,922 |  |  | (27,474 | ) |  | 683,223 |
Dedicated |  | 115,012 |  |  | - |  |  | (19 | ) |  | 114,993 |  |  |  | - |  |  | - |  |  | - |  |  | - |
Total revenue | $ | 3,107,394 |  | $ | 1,029,160 |  | $ | (101,657 | ) | $ | 4,034,897 |  |  | $ | 2,734,541 |  | $ | 948,735 |  | $ | (110,486 | ) | $ | 3,572,790 |
| Twelve Months |
| Ended December 31, 2015 |
|  |  |  |  |  |  | Inter- |  | Hub |
|  |  |  |  |  |  | Segment |  | Group |
| Hub |  | Mode |  | Elims |  | Total |
Intermodal | $ | 1,792,046 |  | $ | 483,910 |  | $ | (78,688 | ) | $ | 2,197,268 |
Truck brokerage |  | 355,402 |  |  | 314,498 |  |  | (1,908 | ) |  | 667,992 |
Logistics |  | 531,870 |  |  | 130,253 |  |  | (1,788 | ) |  | 660,335 |
Total revenue | $ | 2,679,318 |  | $ | 928,661 |  | $ | (82,384 | ) | $ | 3,525,595 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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