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Note 7 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenues from external customers	$ 1,348,831	$ 1,203,523	$ 2,589,612	$ 2,248,320
Segment operating income	43,426	37,407	75,815	62,256
Segment income before taxes	38,932	34,583	67,015	56,641
Segment assets	3,016,463	2,691,799	3,016,463	2,691,799	$ 2,890,139
Truck Segment [Member]
Revenues from external customers	1,344,271	1,199,703	2,580,924	2,240,556
Segment operating income	43,126	37,546	75,486	62,540
Segment income before taxes	38,684	34,766	66,787	57,010
Segment assets	2,981,063	2,655,860	2,981,063	2,655,860
Other Segments [Member]
Revenues from external customers	4,560	3,821	8,688	7,764
Segment operating income	300	(139)	329	(284)
Segment income before taxes	248	(183)	228	(368)
Segment assets	$ 35,400	$ 35,939	$ 35,400	$ 35,939

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