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OPERATING SEGMENT DATA - Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
OPERATING INCOME |  |
Operating income | $ 32,191 | $ 7,819
OTHER INCOME (COSTS) |  |
Interest and dividend income | 392 | 1,375
Interest and other related financing costs | (2,428) | (2,947)
Other, net | 1,192 | (3,862)
TOTAL OTHER INCOME (COSTS) | (844) | (5,434)
INCOME BEFORE INCOME TAXES | 31,347 | 2,385
Operating Segments | Asset Based |  |
OPERATING INCOME |  |
Operating income | 30,055 | 13,240
Operating Segments | ArcBest |  |
OPERATING INCOME |  |
Operating income | 8,265 | (1,409)
Operating Segments | FleetNet |  |
OPERATING INCOME |  |
Operating income | 1,023 | 1,040
Other and eliminations |  |
OPERATING INCOME |  |
Operating income | $ (7,152) | $ (5,052)

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