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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Revenue $ 836,685 $ 778,312 $ 1,605,665 $ 1,518,197
Transportation costs 741,212 690,954 1,422,854 1,347,097
Gross margin 95,473 87,358 182,811 171,100
Costs and expenses:        
Salaries and benefits 35,002 31,436 69,585 64,735
Agent fees and commissions 13,686 13,601 26,960 27,296
General and administrative 14,728 12,734 27,919 25,311
Depreciation and amortization 1,593 1,737 3,146 3,397
Total costs and expenses 65,009 59,508 127,610 120,739
Operating income 30,464 27,850 55,201 50,361
Other income (expense):        
Interest expense (305) (301) (595) (608)
Interest and dividend income 15 33 44 67
Other, net 23 (18) 12 (41)
Total other (expense) income (267) (286) (539) (582)
Income before provision for income taxes 30,197 27,564 54,662 49,779
Provision for income taxes 11,587 10,612 20,688 19,165
Net income 18,610 16,952 33,974 30,614
Other comprehensive loss:        
Foreign currency translation adjustments (59) (3) (33) (2)
Total comprehensive income $ 18,551 $ 16,949 $ 33,941 $ 30,612
Basic earnings per common share $ 0.50 $ 0.46 $ 0.92 $ 0.83
Diluted earnings per common share $ 0.50 $ 0.46 $ 0.92 $ 0.82
Basic weighted average number of shares outstanding 36,870 37,070 36,863 37,057
Diluted weighted average number of shares outstanding 36,989 37,190 36,969 37,167