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ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (Acquisitions) (Details) - USD ($) $ in Thousands				1 Months Ended		12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Sep. 02, 2016	Jan. 31, 2019	Jan. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquisitions
Net cash consideration								$ 24,780
Divestitures
Proceeds from sale of subsidiaries						$ 4,680	$ 2,490	$ 2,780
ArcBest
Divestitures
Value of divested subsidiaries	$ 5,200	$ 4,800
Proceeds from sale of subsidiaries	500	2,800
Contingent consideration	$ 4,700	$ 2,000
LDS
Acquisitions
Paid from escrow					$ 3,500
LDS | Subsequent Event
Acquisitions
Paid from escrow				$ 4,500
LDS | ArcBest
Acquisitions
Total consideration			$ 25,000
Cash consideration			17,000
Contingent consideration			$ 8,000
Contingent consideration period			2 years

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