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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Revenue $ 1,075,107 $ 924,812 $ 2,975,980 $ 2,542,914
Transportation costs 917,507 816,777 2,589,072 2,223,036
Gross margin 157,600 108,035 386,908 319,878
Costs and expenses:        
Salaries and benefits 65,370 45,576 176,696 146,128
General and administrative 23,445 20,845 63,058 76,151
Depreciation and amortization 8,912 7,697 26,282 22,945
Total costs and expenses 97,727 74,118 266,036 245,224
Operating income 59,873 33,917 120,872 74,654
Other income (expense):        
Interest expense (1,793) (2,237) (5,555) (7,698)
Other, net (96) (122) (382) 106
Total other expense (1,889) (2,359) (5,937) (7,592)
Income before provision for income taxes 57,984 31,558 114,935 67,062
Income tax expense 14,646 6,777 27,775 15,891
Net income 43,338 24,781 87,160 51,171
Other comprehensive (loss) income:        
Foreign currency translation adjustments (25) 23 (10) (74)
Total comprehensive income $ 43,313 $ 24,804 $ 87,150 $ 51,097
Basic earnings per common share $ 1.30 $ 0.75 $ 2.61 $ 1.54
Diluted earnings per common share $ 1.28 $ 0.74 $ 2.58 $ 1.53
Basic weighted average number of shares outstanding 33,433 33,177 33,427 33,169
Diluted weighted average number of shares outstanding 33,873 33,597 33,842 33,513