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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement [Abstract]      
Revenue $ 3,373,898 $ 3,124,108 $ 2,751,534
Transportation costs 3,002,875 2,768,042 2,438,986
Gross margin 371,023 356,066 312,548
Costs and expenses:      
Salaries and benefits 135,341 129,143 121,044
Agent fees and commissions 55,789 55,112 41,491
General and administrative 56,772 52,832 49,951
Depreciation and amortization 6,470 6,619 5,603
Impairment of trade name 2,904    
Total costs and expenses 257,276 243,706 218,089
Operating income 113,747 112,360 94,459
Other income (expense):      
Interest expense (1,246) (1,207) (638)
Interest and dividend income 82 134 148
Other, net (28) (30) 328
Total expense (1,192) (1,103) (162)
Income before provision for income taxes 112,555 111,257 94,297
Provision for income taxes 43,445 43,304 36,119
Net income 69,110 67,953 58,178
Other comprehensive income (loss):      
Foreign currency translation adjustments (86) (3) (2)
Total comprehensive income $ 69,024 $ 67,950 $ 58,176
Basic earnings per common share $ 1.88 $ 1.83 $ 1.58
Diluted earnings per common share $ 1.87 $ 1.83 $ 1.57
Basic weighted average number of shares outstanding 36,829 37,053 36,913
Diluted weighted average number of shares outstanding 36,982 37,185 37,063