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Note 6 - Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Revenues from external customers $ 1,980,740 $ 1,864,286 $ 5,895,559 $ 5,218,729  
Segment operating income 121,621 127,037 392,256 369,559  
Segment income before taxes 107,560 120,547 357,225 381,079  
Segment assets 4,218,053 3,742,579 4,218,053 3,742,579 $ 3,821,066
Truck Segment [Member]          
Revenues from external customers 1,976,395 1,859,823 5,883,127 5,205,802  
Segment operating income 121,675 126,770 391,870 368,596  
Segment income before taxes 107,614 120,373 356,839    
Segment assets 4,163,261 3,688,151 4,163,261 3,688,151  
Other Segments [Member]          
Revenues from external customers 4,345 4,463 12,432 12,927  
Segment operating income   267 386 963  
Segment income before taxes (54) 174 386    
Segment assets $ 54,792 $ 54,428 $ 54,792 $ 54,428