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OPERATING SEGMENT DATA - Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
OPERATING INCOME
Operating income	$ 74,299	$ 20,425	$ 106,490	$ 28,244
OTHER INCOME (COSTS)
Interest and dividend income	322	991	714	2,366
Interest and other related financing costs	(2,274)	(3,378)	(4,702)	(6,325)
Other, net	1,111	2,696	2,303	(1,166)
TOTAL OTHER INCOME (COSTS)	(841)	309	(1,685)	(5,125)
INCOME BEFORE INCOME TAXES	73,458	20,734	104,805	23,119
Operating Segments | Asset Based
OPERATING INCOME
Operating income	63,911	21,036	93,966	34,276
Operating Segments | ArcBest
OPERATING INCOME
Operating income	15,127	1,303	23,392	(106)
Operating Segments | FleetNet
OPERATING INCOME
Operating income	1,138	782	2,161	1,822
Other and eliminations
OPERATING INCOME
Operating income	$ (5,877)	$ (2,696)	$ (13,029)	$ (7,748)

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