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Consolidated Statements Of Income (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements Of Income [Abstract]
Revenue	$ 760,379	$ 478,417	$ 2,005,467	$ 1,353,824
Transportation costs	673,657	421,020	1,776,685	1,197,033
Gross margin	86,722	57,397	228,782	156,791
Costs and expenses:
Salaries and benefits	32,023	25,547	91,570	72,868
Agent fees and commissions	13,884	641	28,400	1,774
General and administrative	12,612	9,564	37,523	28,640
Depreciation and amortization	1,560	938	3,968	2,845
Total costs and expenses	60,079	36,690	161,461	106,127
Operating income	26,643	20,707	67,321	50,664
Other income (expense):
Interest expense	(236)	(12)	(319)	(38)
Interest and dividend income	41	35	118	83
Other, net	17	(68)	286	84
Total other (expense) income	(178)	(45)	85	129
Income before provision for income taxes	26,465	20,662	67,406	50,793
Provision for income taxes	10,189	8,045	26,242	19,844
Net income	$ 16,276	$ 12,617	$ 41,164	$ 30,949
Basic earnings per common share	$ 0.44	$ 0.34	$ 1.12	$ 0.83
Diluted earnings per common share	$ 0.44	$ 0.34	$ 1.11	$ 0.83
Basic weighted average number of shares outstanding	36,923	37,118	36,903	37,358
Diluted weighted average number of shares outstanding	37,065	37,288	37,049	37,504

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Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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