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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