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UNAUDITED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement [Abstract]        
Revenue $ 899,513 $ 893,930 $ 1,735,454 $ 1,742,379
Transportation costs 797,784 795,345 1,544,597 1,555,050
Gross margin 101,729 98,585 190,857 187,329
Costs and expenses:        
Salaries and benefits 38,837 35,556 78,313 72,648
Agent fees and commissions 16,686 15,544 31,512 29,210
General and administrative 14,763 14,681 28,834 30,113
Depreciation and amortization 1,967 1,877 3,927 3,935
Total costs and expenses 72,253 67,658 142,586 135,906
Operating income 29,476 30,927 48,271 51,423
Other income (expense):        
Interest expense (720) (398) (1,461) (805)
Interest and dividend income 19 11 25 25
Other, net 261 (25) (1,143) (230)
Total other expense (440) (412) (2,579) (1,010)
Income before provision for income taxes 29,036 30,515 45,692 50,413
Provision for income taxes 10,569 11,839 16,949 19,702
Net income 18,467 18,676 28,743 30,711
Other comprehensive (loss) income:        
Foreign currency translation adjustments (23) 46 (20) 33
Total comprehensive income $ 18,444 $ 18,722 $ 28,723 $ 30,744
Basic earnings per common share $ 0.51 $ 0.51 $ 0.80 $ 0.84
Diluted earnings per common share $ 0.51 $ 0.51 $ 0.80 $ 0.84
Basic weighted average number of shares outstanding 35,986 36,674 36,071 36,667
Diluted weighted average number of shares outstanding 36,075 36,814 36,122 36,769