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Recent Accounting Pronouncements Recent Accounting Pronouncements (Tables) | 9 Months Ended
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Sep. 30, 2018
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] | The impact of implementing this guidance using the full retrospective approach on the prior period statements of operations are shown in the "As Adjusted" columns of the following tables:
|  | Three months ended September 30, 2017
(In thousands, except per share data) |  | As Previously Reported |  | Adjustments |  | As Adjusted
Revenue |  |  |  |  |  |
Expedited LTL |  | $ | 155,703 |  |  | $ | 9,696 |  |  | $ | 165,399 |
Truckload Premium Services |  | 45,941 |  |  | 5,520 |  |  | 51,461 |
Pool Distribution |  | 39,180 |  |  | 1,003 |  |  | 40,183 |
Intermodal |  | 42,292 |  |  | 1,869 |  |  | 44,161 |
Eliminations and other operations |  | (2,915 | ) |  | — |  |  | (2,915 | )
Consolidated revenue |  | 280,201 |  |  | 18,088 |  |  | 298,289 |
Operating Expenses |  | 253,303 |  |  | 17,810 |  |  | 271,113 |
Income from operations |  | 26,898 |  |  | 278 |  |  | 27,176 |
Income tax expenses |  | 8,453 |  |  | 104 |  |  | 8,557 |
Net Income |  | 18,155 |  |  | 173 |  |  | 18,328 |
Diluted earnings per share |  | $ | 0.60 |  |  | $ | 0.01 |  |  | $ | 0.61 |
|  | Nine months ended September 30, 2017
(In thousands, except per share data) |  | As Previously Reported |  | Adjustments |  | As Adjusted
Revenue |  |  |  |  |  |
Expedited LTL |  | $ | 448,571 |  |  | $ | 26,065 |  |  | $ | 474,636 |
Truckload Premium Services |  | 132,912 |  |  | 16,087 |  |  | 148,999 |
Pool Distribution |  | 113,838 |  |  | 2,903 |  |  | 116,741 |
Intermodal |  | 105,853 |  |  | 4,454 |  |  | 110,307 |
Eliminations and other operations |  | (6,474 | ) |  | — |  |  | (6,474 | )
Consolidated revenue |  | 794,700 |  |  | 49,509 |  |  | 844,209 |
Operating Expenses |  | 714,804 |  |  | 48,491 |  |  | 763,295 |
Income from operations |  | 79,896 |  |  | 1,018 |  |  | 80,914 |
Income tax expenses |  | 27,131 |  |  | 391 |  |  | 27,522 |
Net Income |  | 51,948 |  |  | 627 |  |  | 52,575 |
Diluted earnings per share |  | $ | 1.71 |  |  | $ | 0.02 |  |  | $ | 1.73 |

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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