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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Statement [Abstract]        
Revenue $ 855,557 $ 899,513 $ 1,661,416 $ 1,735,454
Transportation costs 741,067 797,784 1,438,539 1,544,597
Gross margin 114,490 101,729 222,877 190,857
Costs and expenses:        
Salaries and benefits 43,602 38,837 87,465 78,313
Agent fees and commissions 18,360 16,686 35,262 31,512
General and administrative 16,083 14,763 32,727 28,834
Depreciation and amortization 2,148 1,967 4,283 3,927
Total costs and expenses 80,193 72,253 159,737 142,586
Operating income 34,297 29,476 63,140 48,271
Other income (expense):        
Interest expense (857) (720) (1,767) (1,461)
Interest and dividend income 120 19 181 25
Other, net 216 261 1,152 (1,143)
Total other expense (521) (440) (434) (2,579)
Income before provision for income taxes 33,776 29,036 62,706 45,692
Provision for income taxes 13,105 10,569 24,069 16,949
Net income 20,671 18,467 38,637 28,743
Other comprehensive income:        
Foreign currency translation adjustments (54) (23) (53) (20)
Total comprehensive income $ 20,617 $ 18,444 $ 38,584 $ 28,723
Basic earnings per common share $ 0.61 $ 0.51 $ 1.12 $ 0.80
Diluted earnings per common share $ 0.61 $ 0.51 $ 1.12 $ 0.80
Basic weighted average number of shares outstanding 33,944 35,986 34,541 36,071
Diluted weighted average number of shares outstanding 34,027 36,075 34,575 36,122