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CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Revenue $ 804,888 $ 752,179 $ 2,323,085 $ 1,988,759
Transportation costs 713,301 665,478 2,060,398 1,760,022
Gross margin 91,587 86,701 262,687 228,737
Costs and expenses:        
Salaries and benefits 31,385 32,002 96,120 91,525
Agent fees and commissions 13,810 13,884 41,106 28,400
General and administrative 14,430 12,612 39,741 37,523
Depreciation and amortization 1,611 1,560 5,008 3,968
Total costs and expenses 61,236 60,058 181,975 161,416
Operating income 30,351 26,643 80,712 67,321
Other income (expense):        
Interest expense (300) (236) (908) (319)
Interest and dividend income 37 41 104 118
Other, net (17) 17 (58) 286
Total other (expense) income (280) (178) (862) 85
Income before provision for income taxes 30,071 26,465 79,850 67,406
Provision for income taxes 11,576 10,189 30,741 26,242
Net income 18,495 16,276 49,109 41,164
Other comprehensive income:        
Foreign currency translation adjustments   (5) (2) (5)
Total comprehensive income $ 18,495 $ 16,271 $ 49,107 $ 41,159
Basic earnings per common share $ 0.50 $ 0.44 $ 1.32 $ 1.12
Diluted earnings per common share $ 0.50 $ 0.44 $ 1.32 $ 1.11
Basic weighted average number of shares outstanding 37,079 36,923 37,064 36,903
Diluted weighted average number of shares outstanding 37,206 37,065 37,180 37,049