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UNAUDITED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement [Abstract]        
Revenue $ 924,812 $ 913,275 $ 2,542,914 $ 2,767,436
Transportation costs 816,777 778,057 2,223,036 2,372,226
Gross margin 108,035 135,218 319,878 395,210
Costs and expenses:        
Salaries and benefits 45,576 59,765 146,128 182,652
General and administrative 20,845 30,906 76,151 77,852
Depreciation and amortization 7,697 7,301 22,945 21,150
Total costs and expenses 74,118 97,972 245,224 281,654
Operating income 33,917 37,246 74,654 113,556
Other income (expense):        
Interest expense (2,237) (2,780) (7,698) (8,526)
Other, net (122) 669 106 1,567
Total other expense (2,359) (2,111) (7,592) (6,959)
Income before provision for income taxes 31,558 35,135 67,062 106,597
Income tax expense 6,777 9,030 15,891 27,381
Net income 24,781 26,105 51,171 79,216
Other comprehensive income:        
Foreign currency translation adjustments 23 (33) (74) (29)
Total comprehensive income $ 24,804 $ 26,072 $ 51,097 $ 79,187
Basic earnings per common share $ 0.75 $ 0.79 $ 1.54 $ 2.37
Diluted earnings per common share $ 0.74 $ 0.78 $ 1.53 $ 2.36
Basic weighted average number of shares outstanding 33,177 33,034 33,169 33,385
Diluted weighted average number of shares outstanding 33,597 33,265 33,513 33,522