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Consolidated Statements Of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Income [Abstract]      
Revenue $ 2,751,534 $ 1,833,737 $ 1,510,970
Transportation costs 2,438,986 1,620,304 1,325,280
Gross margin 312,548 213,433 185,690
Costs and expenses:      
Salaries and benefits 121,044 99,138 88,518
Agent fees and commissions 41,491 2,410 1,287
General and administrative 49,951 38,211 36,180
Depreciation and amortization 5,603 3,792 4,174
Total costs and expenses 218,089 143,551 130,159
Operating income 94,459 69,882 55,531
Other income (expense):      
Interest expense (638) (54) (91)
Interest and dividend income 148 119 146
Other, net 328 146 299
Total other (expense) income (162) 211 354
Income before provision for income taxes 94,297 70,093 55,885
Provision for income taxes 36,119 26,635 21,620
Net income $ 58,178 $ 43,458 $ 34,265
Basic earnings per common share $ 1.58 $ 1.17 $ 0.92
Diluted earnings per common share $ 1.57 $ 1.16 $ 0.91
Basic weighted average number of shares outstanding 36,913 37,223 37,367
Diluted weighted average number of shares outstanding 37,063 37,385 37,525