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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement [Abstract]      
Revenue $ 3,525,595 $ 3,571,126 $ 3,373,898
Transportation costs 3,112,900 3,200,691 3,002,875
Gross margin 412,695 370,435 371,023
Costs and expenses:      
Salaries and benefits 158,938 136,480 135,341
Agent fees and commissions 68,724 62,041 55,789
General and administrative 60,015 58,014 56,772
Depreciation and amortization 7,988 7,799 6,470
Driver settlements and related costs   10,343  
Impairment of software   11,881  
Impairment of trade name     2,904
Total costs and expenses 295,665 286,558 257,276
Operating income 117,030 83,877 113,747
Other income (expense):      
Interest expense (2,971) (1,785) (1,246)
Interest and dividend income 83 32 82
Other, net (2,560) (257) (28)
Total other expense (5,448) (2,010) (1,192)
Income before provision for income taxes 111,582 81,867 112,555
Provision for income taxes 40,633 30,309 43,445
Net income 70,949 51,558 69,110
Other comprehensive income (loss):      
Foreign currency translation adjustments (101) 8 (86)
Total comprehensive income $ 70,848 $ 51,566 $ 69,024
Basic earnings per common share $ 1.98 $ 1.41 $ 1.88
Diluted earnings per common share $ 1.97 $ 1.40 $ 1.87
Basic weighted average number of shares outstanding 35,876 36,590 36,829
Diluted weighted average number of shares outstanding 35,968 36,732 36,982