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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]      
Revenue $ 3,683,593 $ 3,123,063 $ 2,750,449
Transportation costs 3,237,992 2,785,433 2,419,130
Gross margin 445,601 337,630 331,319
Costs and expenses:      
Salaries and benefits 222,786 175,567 166,118
General and administrative 81,272 77,239 60,932
Depreciation and amortization 16,624 12,155 7,712
Total costs and expenses 320,682 264,961 234,762
Operating income 124,919 72,669 96,557
Other income (expense):      
Interest expense (9,611) (6,754) (3,625)
Interest income 1,359 349 346
Other, net 58 667 749
Total other income (expense) (8,194) (5,738) (2,530)
Income from continuing operations before income taxes 116,725 66,931 94,027
Income tax expense (benefit) 29,064 (53,083) 36,381
Income from continuing operations 87,661 120,014 57,646
Income from discontinued operations, net of income taxes 114,079 15,139 17,159
Net income 201,740 135,153 74,805
Other comprehensive income (loss):      
Foreign currency translation adjustments 12 79 (95)
Total comprehensive income $ 201,752 $ 135,232 $ 74,710
Earnings per share from continuing operations      
Basic $ 2.62 $ 3.61 $ 1.70
Diluted 2.61 3.60 1.70
Earnings per share from discontinued operations      
Basic 3.42 0.46 0.51
Diluted 3.40 0.45 0.51
Earnings per share net income      
Basic 6.04 4.07 2.21
Diluted $ 6.01 $ 4.05 $ 2.20
Basic weighted average number of shares outstanding 33,393 33,220 33,841
Diluted weighted average number of shares outstanding 33,560 33,350 33,949