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UNAUDITED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Revenue $ 805,859 $ 835,941
Transportation costs 697,472 746,813
Gross margin 108,387 89,128
Costs and expenses:    
Salaries and benefits 43,863 39,476
Agent fees and commissions 16,901 14,826
General and administrative 16,644 14,071
Depreciation and amortization 2,136 1,960
Total costs and expenses 79,544 70,333
Operating income 28,843 18,795
Other income (expense):    
Interest expense (911) (741)
Interest and dividend income 61 6
Other, net 936 (1,404)
Total other income (expense) 86 (2,139)
Income before provision for income taxes 28,929 16,656
Provision for income taxes 10,964 6,380
Net income 17,965 10,276
Other comprehensive income:    
Foreign currency translation adjustments 1 3
Total comprehensive income $ 17,966 $ 10,279
Basic earnings per common share $ 0.51 $ 0.28
Diluted earnings per common share $ 0.51 $ 0.28
Basic weighted average number of shares outstanding 35,137 36,156
Diluted weighted average number of shares outstanding 35,122 36,169