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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Statement [Abstract]        
Revenue $ 933,224 $ 824,809 $ 2,665,300 $ 2,213,824
Transportation costs 818,240 738,482 2,358,286 1,982,800
Gross margin 114,984 86,327 307,014 231,024
Costs and expenses:        
Salaries and benefits 57,123 45,978 163,496 127,643
General and administrative 19,327 20,637 55,557 57,681
Depreciation and amortization 3,800 3,966 11,286 8,331
Total costs and expenses 80,250 70,581 230,339 193,655
Operating income 34,734 15,746 76,675 37,369
Other income (expense):        
Interest expense (2,411) (2,345) (6,702) (4,474)
Interest and dividend income 340 42 365 332
Other, net 251 355 20 533
Total other expense (1,820) (1,948) (6,317) (3,609)
Income from Continuing Operations Before Income Taxes 32,914 13,798 70,358 33,760
Provision for income taxes 7,150 2,210 16,371 10,060
Income from Continuing Operations 25,764 11,588 53,987 23,700
Income from Discontinued Operations, net of income taxes 88,846 3,746 98,842 11,510
Net income 114,610 15,334 152,829 35,210
Other comprehensive income:        
Foreign currency translation adjustments 22 9 25 101
Total comprehensive income $ 114,632 $ 15,343 $ 152,854 $ 35,311
Earnings per share from continuing operations        
Basic $ 0.77 $ 0.35 $ 1.62 $ 0.71
Diluted 0.77 0.35 1.61 0.71
Earnings per share from discontinued operations        
Basic 2.66 0.11 2.96 0.35
Diluted 2.64 0.11 2.95 0.35
Earnings per share net income        
Basic 3.43 0.46 4.58 1.06
Diluted $ 3.41 $ 0.46 $ 4.56 $ 1.06
Basic weighted average number of shares outstanding 33,399 33,227 33,387 33,217
Diluted weighted average number of shares outstanding 33,605 33,335 33,548 33,323