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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Statement [Abstract]        
Revenue $ 882,981 $ 804,888 $ 2,488,646 $ 2,323,085
Transportation costs 789,857 713,301 2,212,711 2,060,398
Gross margin 93,124 91,587 275,935 262,687
Costs and expenses:        
Salaries and benefits 31,888 31,385 101,473 96,120
Agent fees and commissions 14,557 13,810 41,517 41,106
General and administrative 13,757 14,430 41,676 39,741
Depreciation and amortization 1,627 1,611 4,773 5,008
Total costs and expenses 61,829 61,236 189,439 181,975
Operating income 31,295 30,351 86,496 80,712
Other income (expense):        
Interest expense (323) (300) (918) (908)
Interest and dividend income 25 37 69 104
Other, net (35) (17) (23) (58)
Total other expense (333) (280) (872) (862)
Income before provision for income taxes 30,962 30,071 85,624 79,850
Provision for income taxes 12,362 11,576 33,050 30,741
Net income 18,600 18,495 52,574 49,109
Other comprehensive loss:        
Foreign currency translation adjustments (74)   (107) (2)
Total comprehensive income $ 18,526 $ 18,495 $ 52,467 $ 49,107
Basic earnings per common share $ 0.50 $ 0.50 $ 1.43 $ 1.32
Diluted earnings per common share $ 0.50 $ 0.50 $ 1.42 $ 1.32
Basic weighted average number of shares outstanding 36,873 37,079 36,866 37,064
Diluted weighted average number of shares outstanding 37,050 37,206 36,996 37,180