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Note 7 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Revenues from external customers | $ 1,544,561 | $ 1,348,831 | $ 2,892,878 | $ 2,589,612 |
Segment operating income | 61,792 | 43,426 | 118,659 | 75,815 |
Segment income before taxes | 54,410 | 38,932 | 103,968 | 67,015 |
Segment assets | 3,530,695 | 3,016,463 | 3,530,695 | 3,016,463 | $ 3,201,350
Truck Segment [Member] |  |  |  |  |
Revenues from external customers | 1,540,237 | 1,344,271 | 2,884,686 | 2,580,924 |
Segment operating income | 61,579 | 43,126 | 118,321 | 75,486 |
Segment income before taxes | 54,269 | 38,684 | 103,774 | 66,787 |
Segment assets | 3,490,254 | 2,981,063 | 3,490,254 | 2,981,063 |
Other Segments [Member] |  |  |  |  |
Revenues from external customers | 4,324 | 4,560 | 8,192 | 8,688 |
Segment operating income | 213 | 300 | 338 | 329 |
Segment income before taxes | 141 | 248 | 194 | 228 |
Segment assets | $ 40,441 | $ 35,400 | $ 40,441 | $ 35,400 |

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