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GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Goodwill by reportable operating segment
Balance at the beginning of the period	$ 108,320
Goodwill impairment	(20,000)
Balance at the end of the period	88,320
Accumulated impairment	(20,000)
ArcBest
Goodwill by reportable operating segment
Balance at the beginning of the period	107,690
Goodwill impairment	(20,000)
Balance at the end of the period	87,690
Accumulated impairment	(20,000)
FleetNet
Goodwill by reportable operating segment
Balance at the beginning of the period	630
Balance at the end of the period	$ 630

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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