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Note 7 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Revenues from external customers | $ 1,599,265 | $ 1,376,136 | $ 4,492,143 | $ 3,965,748 |
Segment operating income (loss) | 58,323 | 58,649 | 176,982 | 134,464 |
Segment income before taxes | 52,210 | 54,181 | 156,178 | 121,196 |
Segment assets | 3,405,254 | 3,189,803 | 3,405,254 | 3,189,803 | $ 3,201,350
Truck Segment [Member] |  |  |  |  |
Revenues from external customers | 1,595,285 | 1,371,472 | 4,479,972 | 3,952,396 |
Segment operating income (loss) | 58,642 | 58,665 | 176,963 | 134,151 |
Segment income before taxes | 51,250 | 54,250 | 155,024 | 121,037 |
Segment assets | 3,364,895 | 3,152,204 | 3,364,895 | 3,152,204 |
Other Segments [Member] |  |  |  |  |
Revenues from external customers | 3,980 | 4,664 | 12,171 | 13,352 |
Segment operating income (loss) | (319) | (16) | 19 | 313 |
Segment income before taxes | 960 | (69) | 1,154 | 159 |
Segment assets | $ 40,359 | $ 37,599 | $ 40,359 | $ 37,599 |

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