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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