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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Statement [Abstract]    
Revenue $ 848,449 $ 768,980
Transportation costs 759,705 681,642
Gross margin 88,744 87,338
Costs and expenses:    
Salaries and benefits 37,092 34,583
Agent fees and commissions 13,666 13,274
General and administrative 15,432 13,191
Depreciation and amortization 2,058 1,553
Total costs and expenses 68,248 62,601
Operating income 20,496 24,737
Other income (expense):    
Interest expense (407) (290)
Interest and dividend income 14 29
Other, net (205) (11)
Total other expense (598) (272)
Income before provision for income taxes 19,898 24,465
Provision for income taxes 7,863 9,101
Net income 12,035 15,364
Other comprehensive (loss) income:    
Foreign currency translation adjustments (13) 26
Total comprehensive income $ 12,022 $ 15,390
Basic earnings per common share $ 0.33 $ 0.42
Diluted earnings per common share $ 0.33 $ 0.42
Basic weighted average number of shares outstanding 36,661 36,855
Diluted weighted average number of shares outstanding 36,724 36,949