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UNAUDITED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Revenue $ 838,859 $ 932,998
Transportation costs 734,265 805,709
Gross margin 104,594 127,289
Costs and expenses:    
Salaries and benefits 50,876 62,028
General and administrative 26,336 22,918
Depreciation and amortization 7,623 6,754
Total costs and expenses 84,835 91,700
Operating income 19,759 35,589
Other income (expense):    
Interest expense (2,455) (3,056)
Interest and dividend income 403 373
Other expense, net (222) (40)
Total other expense (2,274) (2,723)
Income before provision for income taxes 17,485 32,866
Provision for income taxes 4,249 8,972
Net income 13,236 23,894
Other comprehensive income:    
Foreign currency translation adjustments (134) 7
Total comprehensive income $ 13,102 $ 23,901
Basic earnings per common share $ 0.40 $ 0.71
Diluted earnings per common share $ 0.40 $ 0.71
Basic weighted average number of shares outstanding 33,159 33,569
Diluted weighted average number of shares outstanding 33,488 33,585