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OPERATING SEGMENT DATA - Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Revenues	$ 948,973	$ 627,370	$ 1,778,186	$ 1,328,769
Asset Based
Revenues
Revenues	630,145	439,585	1,159,869	935,313
ArcBest
Revenues
Revenues	268,038	149,683	518,279	312,631
FleetNet
Revenues
Revenues	49,951	37,245	98,385	78,989
Operating Segments | Asset Based
Revenues
Revenues	652,832	460,070	1,209,124	975,783
Operating Segments | ArcBest
Revenues
Revenues	270,748	151,467	523,084	316,242
Operating Segments | FleetNet
Revenues
Revenues	59,547	46,440	118,710	98,879
Other and eliminations
Revenues
Revenues	$ (34,154)	$ (30,607)	$ (72,732)	$ (62,135)

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