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Note 7 - Segment Information (Details) - Segment Reporting Information (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers, by segment | $ 1,182,461 | $ 789,674 | $ 2,141,128 | $ 1,546,462 |
Segment income (loss) from continuing operations before taxes, by segment | 32,389 | 9,309 | 52,004 | 31,409 |
Segment assets, by segment | 2,353,564 | 1,972,240 | 2,353,564 | 1,972,240 | 2,167,798
Truck Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers, by segment | 1,177,306 | 784,573 | 2,131,936 | 1,536,803 |
Segment income (loss) from continuing operations before taxes, by segment | 32,112 | 8,943 | 52,093 | 31,091 |
Segment assets, by segment | 2,321,639 | 1,945,552 | 2,321,639 | 1,945,552 |
Other Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues from external customers, by segment | 5,155 | 5,101 | 9,192 | 9,659 |
Segment income (loss) from continuing operations before taxes, by segment | 277 | 366 | (89) | 318 |
Segment assets, by segment | $ 31,925 | $ 26,688 | $ 31,925 | $ 26,688 |

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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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