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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Statement [Abstract]      
Revenue $ 3,495,644 $ 3,668,117 $ 3,683,593
Transportation costs 3,070,207 3,147,047 3,237,992
Gross margin 425,437 521,070 445,601
Costs and expenses:      
Salaries and benefits 188,777 235,963 222,786
General and administrative 99,597 104,206 81,272
Depreciation and amortization 31,237 28,481 16,624
Total costs and expenses 319,611 368,650 320,682
Operating income 105,826 152,420 124,919
Other income (expense):      
Interest expense (9,746) (10,994) (9,611)
Interest income 403 2,103 1,359
Other, net (383) 341 58
Total other income (expense) (9,726) (8,550) (8,194)
Income from continuing operations before income taxes 96,100 143,870 116,725
Income tax expense 22,541 36,699 29,064
Income from continuing operations 73,559 107,171 87,661
Income from discontinued operations, net of income taxes     114,079
Net income 73,559 107,171 201,740
Other comprehensive (loss) income:      
Foreign currency translation adjustments (5) (4) 12
Total comprehensive income $ 73,554 $ 107,167 $ 201,752
Earnings per share from continuing operations      
Basic $ 2.22 $ 3.22 $ 2.62
Diluted 2.19 3.20 2.61
Earnings per share from discontinued operations      
Basic     3.42
Diluted     3.40
Earnings per share net income      
Basic 2.22 3.22 6.04
Diluted $ 2.19 $ 3.20 $ 6.01
Basic weighted average number of shares outstanding 33,180 33,284 33,393
Diluted weighted average number of shares outstanding 33,543 33,480 33,560