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Note 7 - Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Revenues from external customers $ 1,316,015 $ 1,002,512 $ 2,547,821 $ 2,289,175  
Segment operating income 72,791 23,001 129,016 58,198  
Segment income before taxes 74,749 22,512 131,386 54,181  
Segment assets 2,912,124 3,064,601 2,912,124 3,064,601 $ 2,985,393
Truck Segment [Member]          
Revenues from external customers 1,311,678 998,739 2,539,790 2,282,118  
Segment operating income 72,163 22,678 128,113 58,129  
Segment income before taxes 74,191 22,260 130,623 54,253  
Segment assets 2,863,087 3,021,241 2,863,087 3,021,241  
Other Segments [Member]          
Revenues from external customers 4,337 3,773 8,031 7,057  
Segment operating income 628 323 903 69  
Segment income before taxes 558 252 763 (72)  
Segment assets $ 49,037 $ 43,360 $ 49,037 $ 43,360