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OPERATING SEGMENT DATA - Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING INCOME
Operating income	$ 399,269	$ 280,986	$ 98,278
OTHER INCOME (COSTS)
Interest and dividend income	3,957	1,275	3,616
Interest and other related financing costs	(7,701)	(8,904)	(11,697)
Other, net	(2,370)	3,797	2,299
TOTAL OTHER INCOME (COSTS)	(6,114)	(3,832)	(5,782)
INCOME BEFORE INCOME TAXES	393,155	277,154	92,496
Operating Segments | Asset Based
OPERATING INCOME
Operating income	381,133	260,707	98,865
Operating Segments | ArcBest
OPERATING INCOME
Operating income	52,725	46,397	9,655
Operating Segments | FleetNet
OPERATING INCOME
Operating income	5,825	4,544	3,367
Other and eliminations
OPERATING INCOME
Operating income	$ (40,414)	$ (30,662)	$ (13,609)

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