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Note F - Segment Information - Segment Revenue Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue, before fuel surcharges	$ 201,502	$ 252,630	$ 630,639	$ 709,246
Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 174,348	$ 216,475	549,885	615,303
Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 549,885	$ 615,303
Revenue, before fuel surcharges, percentage	100.00%	100.00%	100.00%	100.00%
Truckload Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 112,257	$ 144,982
Truckload Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 357,681	$ 404,658
Revenue, before fuel surcharges, percentage	64.40%	67.00%	65.10%	65.80%
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member]
Revenue, before fuel surcharges	$ 62,091	$ 71,493
Brokerage and Logistics Services [Member] | Freight Transportation Service [Member] | Revenue Benchmark [Member] | Product Concentration Risk [Member]
Revenue, before fuel surcharges			$ 192,204	$ 210,645
Revenue, before fuel surcharges, percentage	35.60%	33.00%	34.90%	34.20%

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