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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Income Statement [Abstract]    
Operating revenue $ 1,152,265 $ 1,298,123
Operating expenses:    
Purchased transportation and warehousing 866,931 995,265
Salaries and benefits 137,431 128,739
Depreciation and amortization 35,449 31,289
Insurance and claims 12,683 9,293
General and administrative 25,541 23,222
Gain on sale of assets, net (3,975) (4,745)
Total operating expenses 1,074,060 1,183,063
Operating income 78,205 115,060
Other income (expense):    
Interest expense (2,970) (1,703)
Interest income 1,377 4
Other, net 38 132
Total other expense, net (1,555) (1,567)
Income before provision for income taxes 76,650 113,493
Provision for income taxes 14,870 25,990
Net income 61,780 87,503
Other comprehensive income:    
Foreign currency translation adjustments 34 20
Total comprehensive income $ 61,814 $ 87,523
Basic earnings per common share $ 1.90 $ 2.60
Diluted earnings per common share $ 1.88 $ 2.58
Basic weighted average number of shares outstanding 32,549 33,644
Diluted weighted average number of shares outstanding 32,838 33,966