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Recent Accounting Pronouncements Recent Accounting Pronouncements (Tables) | 3 Months Ended
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Mar. 31, 2018
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] | We recast certain prior period amounts to conform with the adoption of the revenue recognition standard, as shown in the following tables:
|  | Three months ended March 31, 2017
(In thousands, except per share data) |  | As Previously Reported |  | Adjustments |  | As Adjusted
Income Statement: |  |  |  |  |  |
Revenue |  |  |  |  |  |
LTL revenue |  | $ | 140,598 |  |  | $ | 8,167 |  |  | $ | 148,765 |
Truckload Premium Services |  | 41,785 |  |  | 5,303 |  |  | 47,088 |
Pool Distribution |  | 37,823 |  |  | 978 |  |  | 38,801 |
Intermodal |  | 28,291 |  |  | 616 |  |  | 28,907 |
Eliminations and other operations |  | (1,515 | ) |  | — |  |  | (1,515 | )
Consolidated revenue |  | 246,982 |  |  | 15,064 |  |  | 262,046 |
Operating Expenses |  | 223,793 |  |  | 14,510 |  |  | 238,303 |
Income from operations |  | 23,189 |  |  | 554 |  |  | 23,743 |
Income tax expenses |  | 8,638 |  |  | 216 |  |  | 8,854 |
Net Income |  | 14,243 |  |  | 338 |  |  | 14,581 |
Diluted earnings per share |  | $ | 0.47 |  |  | $ | 0.01 |  |  | $ | 0.48 |
|  | December 31, 2017
|  | As Previously Reported |  | Adjustments |  | As Adjusted
Balance Sheet: |  |  |  |  |  |
Accounts receivable, net |  | $ | 143,041 |  |  | $ | 4,907 |  |  | $ | 147,948 |
Accounts payable |  | 24,704 |  |  | 6,019 |  |  | 30,723 |
Deferred income taxes |  | 29,403 |  |  | (323 | ) |  | 29,080 |
Retained earnings |  | 337,848 |  |  | (790 | ) |  | 337,058 |

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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 -Glossary Direct Effects of a Change in Accounting Principle -URI http://asc.fasb.org/extlink&oid=66092750 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Indirect Effects of a Change in Accounting Principle -URI http://asc.fasb.org/extlink&oid=6515603 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accounting Change -URI http://asc.fasb.org/extlink&oid=6503790 Reference 6: 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 7: 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 8: 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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Change in Accounting Principle -URI http://asc.fasb.org/extlink&oid=6507316 Reference 10: 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 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Retrospective Application -URI http://asc.fasb.org/extlink&oid=6523989 + Details
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