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UNAUDITED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Statement [Abstract]        
Revenue $ 893,930 $ 836,685 $ 1,742,379 $ 1,605,665
Transportation costs 795,345 741,212 1,555,050 1,422,854
Gross margin 98,585 95,473 187,329 182,811
Costs and expenses:        
Salaries and benefits 35,556 35,002 72,648 69,585
Agent fees and commissions 15,544 13,686 29,210 26,960
General and administrative 14,681 14,728 30,113 27,919
Depreciation and amortization 1,877 1,593 3,935 3,146
Total costs and expenses 67,658 65,009 135,906 127,610
Operating income 30,927 30,464 51,423 55,201
Other income (expense):        
Interest expense (398) (305) (805) (595)
Interest and dividend income 11 15 25 44
Other, net (25) 23 (230) 12
Total other expense (412) (267) (1,010) (539)
Income before provision for income taxes 30,515 30,197 50,413 54,662
Provision for income taxes 11,839 11,587 19,702 20,688
Net income 18,676 18,610 30,711 33,974
Other comprehensive income (loss):        
Foreign currency translation adjustments 46 (59) 33 (33)
Total comprehensive income $ 18,722 $ 18,551 $ 30,744 $ 33,941
Basic earnings per common share $ 0.51 $ 0.50 $ 0.84 $ 0.92
Diluted earnings per common share $ 0.51 $ 0.50 $ 0.84 $ 0.92
Basic weighted average number of shares outstanding 36,674 36,870 36,667 36,863
Diluted weighted average number of shares outstanding 36,814 36,989 36,769 36,969