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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]      
Revenue $ 3,668,117 $ 3,683,593 $ 3,123,063
Transportation costs 3,147,047 3,237,992 2,785,433
Gross margin 521,070 445,601 337,630
Costs and expenses:      
Salaries and benefits 235,963 222,786 175,567
General and administrative 104,206 81,272 77,239
Depreciation and amortization 28,481 16,624 12,155
Total costs and expenses 368,650 320,682 264,961
Operating income 152,420 124,919 72,669
Other income (expense):      
Interest expense (10,994) (9,611) (6,754)
Interest income 2,103 1,359 349
Other, net 341 58 667
Total other income (expense) (8,550) (8,194) (5,738)
Income from continuing operations before income taxes 143,870 116,725 66,931
Income tax expense (benefit) 36,699 29,064 (53,083)
Income from continuing operations 107,171 87,661 120,014
Income from discontinued operations, net of income taxes   114,079 15,139
Net income 107,171 201,740 135,153
Other comprehensive (loss) income:      
Foreign currency translation adjustments (4) 12 79
Total comprehensive income $ 107,167 $ 201,752 $ 135,232
Earnings per share from continuing operations      
Basic $ 3.22 $ 2.62 $ 3.61
Diluted 3.20 2.61 3.60
Earnings per share from discontinued operations      
Basic   3.42 0.46
Diluted   3.40 0.45
Earnings per share net income      
Basic 3.22 6.04 4.07
Diluted $ 3.20 $ 6.01 $ 4.05
Basic weighted average number of shares outstanding 33,284 33,393 33,220
Diluted weighted average number of shares outstanding 33,480 33,560 33,350