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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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenue $ 778,312 $ 751,201 $ 1,518,197 $ 1,236,580
Transportation costs 690,954 666,472 1,347,097 1,094,544
Gross margin 87,358 84,729 171,100 142,036
Costs and expenses:        
Salaries and benefits 31,436 32,722 64,735 59,523
Agent fees and commissions 13,601 13,765 27,296 14,516
General and administrative 12,734 12,852 25,311 24,911
Depreciation and amortization 1,737 1,472 3,397 2,408
Total costs and expenses 59,508 60,811 120,739 101,358
Operating income 27,850 23,918 50,361 40,678
Other income (expense):        
Interest expense (301) (69) (608) (83)
Interest and dividend income 33 45 67 77
Other, net (18) 60 (41) 269
Total other (expense) income (286) 36 (582) 263
Income before provision for income taxes 27,564 23,954 49,779 40,941
Provision for income taxes 10,612 9,564 19,165 16,053
Net income 16,952 14,390 30,614 24,888
Other comprehensive income:        
Foreign currency translation adjustments (3)   (2)  
Total comprehensive income $ 16,949 $ 14,390 $ 30,612 $ 24,888
Basic earnings per common share $ 0.46 $ 0.39 $ 0.83 $ 0.67
Diluted earnings per common share $ 0.46 $ 0.39 $ 0.82 $ 0.67
Basic weighted average number of shares outstanding 37,070 36,901 37,057 36,893
Diluted weighted average number of shares outstanding 37,190 37,060 37,167 37,041