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GOODWILL AND INTANGIBLE ASSETS (Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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