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Consolidated Statements Of Income (USD $)
In Thousands, except Per Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Consolidated Statements Of Income        
Revenue $ 759,709 $ 458,113 $ 1,245,088 $ 875,407
Transportation costs 674,956 407,537 1,103,028 776,013
Gross margin 84,753 50,576 142,060 99,394
Costs and expenses:        
Salaries and benefits 32,746 23,863 59,547 47,321
Agent fees and commissions 13,765 584 14,516 1,133
General and administrative 12,852 9,480 24,911 19,076
Depreciation and amortization 1,472 934 2,408 1,907
Total costs and expenses 60,835 34,861 101,382 69,437
Operating income 23,918 15,715 40,678 29,957
Other income (expense):        
Interest expense (69) (12) (83) (26)
Interest and dividend income 45 23 77 48
Other, net 60 84 269 152
Total other income 36 95 263 174
Income before provision for income taxes 23,954 15,810 40,941 30,131
Provision for income taxes 9,564 6,180 16,053 11,799
Net income $ 14,390 $ 9,630 $ 24,888 $ 18,332
Basic earnings per common share $ 0.39 $ 0.26 $ 0.67 $ 0.49
Diluted earnings per common share $ 0.39 $ 0.26 $ 0.67 $ 0.49
Basic weighted average number of shares outstanding 36,901 37,429 36,893 37,478
Diluted weighted average number of shares outstanding 37,060 37,580 37,041 37,611