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OPERATING SEGMENT DATA (Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
OPERATING SEGMENT DATA      
CAPITAL EXPENDITURES, GROSS $ 160,684 $ 137,675 $ 149,951
DEPRECIATION AND AMORTIZATION EXPENSE 112,466 108,635 103,068
Amortization of intangibles 4,367 4,521 4,538
Operating Segments | ArcBest      
OPERATING SEGMENT DATA      
CAPITAL EXPENDITURES, GROSS 3,909 5,174 9,823
DEPRECIATION AND AMORTIZATION EXPENSE 11,344 13,750 13,090
Amortization of intangibles 4,200 4,300 4,300
Operating Segments | FleetNet      
OPERATING SEGMENT DATA      
CAPITAL EXPENDITURES, GROSS 590 1,365 1,089
DEPRECIATION AND AMORTIZATION EXPENSE 1,341 1,140 1,089
Amortization of intangibles 200 200 200
Operating Segments | Asset-Based      
OPERATING SEGMENT DATA      
CAPITAL EXPENDITURES, GROSS 122,437 116,505 112,751
DEPRECIATION AND AMORTIZATION EXPENSE 89,798 85,951 82,507
Assets acquired through notes payable and capital leases 67,600 86,800 84,200
Other and eliminations      
OPERATING SEGMENT DATA      
CAPITAL EXPENDITURES, GROSS 33,748 14,631 26,288
DEPRECIATION AND AMORTIZATION EXPENSE 9,983 7,794 $ 6,382
Assets acquired through notes payable $ 23,200 $ 6,900