Business Segments (Summary Of Operating Results) (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Business Segments [Line Items]
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
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
Capital expenditures	20,101	11,311	35,382	13,362
Mode [Member]
Business Segments [Line Items]
Revenue	205,961		407,717
Transportation costs	182,845		362,434
Gross margin	23,116		45,283
Salaries and benefits	5,139		9,774
Agent fees and commissions	13,224		26,351
General and administrative	2,471		5,059
Depreciation and amortization	557		1,078
Total costs and expenses	21,391		42,262
Operating income	1,725		3,021
Capital expenditures	105		132
Inter-Segment Elims [Member]
Business Segments [Line Items]
Revenue	(6,392)		(8,857)
Transportation costs	(6,392)		(8,857)
Gross margin
Salaries and benefits
Agent fees and commissions
General and administrative
Depreciation and amortization
Total costs and expenses
Operating income
Capital expenditures
Hub [Member]
Business Segments [Line Items]
Revenue	560,810	478,417	1,606,607	1,353,824
Transportation costs	497,204	421,020	1,423,108	1,197,033
Gross margin	63,606	57,397	183,499	156,791
Salaries and benefits	26,884	25,547	81,796	72,868
Agent fees and commissions	660	641	2,049	1,774
General and administrative	10,141	9,564	32,464	28,640
Depreciation and amortization	1,003	938	2,890	2,845
Total costs and expenses	38,688	36,690	119,199	106,127
Operating income	24,918	20,707	64,300	50,664
Capital expenditures	$ 19,996	$ 11,311	$ 35,250	$ 13,362

The costs for commissions to independent agents for sales related and transportation coordination services between customers and third party capacity providers during the period.

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Total costs related to services rendered by an entity during the reporting period.

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