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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
Mar. 31, 2012
Mar. 31, 2011
Consolidated Statements Of Income And Other Comprehensive Income [Abstract]    
Revenue $ 739,885 $ 485,379
Transportation costs 656,143 428,072
Gross margin 83,742 57,307
Costs and expenses:    
Salaries and benefits 33,299 26,801
Agent fees and commissions 13,695 751
General and administrative 12,577 12,059
Depreciation and amortization 1,660 936
Total costs and expenses 61,231 40,547
Operating income 22,511 16,760
Other income (expense):    
Interest expense (307) (14)
Interest and dividend income 34 32
Other, net (23) 209
Total other (expense) income (296) 227
Income before provision for income taxes 22,215 16,987
Provision for income taxes 8,553 6,489
Net income 13,662 10,498
Foreign currency translation adjustments 1  
Total comprehensive income $ 13,663 $ 10,498
Basic earnings per common share $ 0.37 $ 0.28
Diluted earnings per common share $ 0.37 $ 0.28
Basic weighted average number of shares outstanding 37,043 36,886
Diluted weighted average number of shares outstanding 37,143 37,022