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GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill by reportable operating segment
Balance at the beginning of the period	$ 108,320	$ 108,875
Goodwill divested		(661)
Purchase accounting adjustments		106
Balance at the end of the period	108,320	108,320
ArcBest
Goodwill by reportable operating segment
Balance at the beginning of the period	107,690	108,245
Goodwill divested		(661)
Purchase accounting adjustments		106
Balance at the end of the period	107,690	107,690
FleetNet
Goodwill by reportable operating segment
Balance at the beginning of the period	630	630
Balance at the end of the period	$ 630	$ 630

X

- 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460

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- Definition

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

+ References

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