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Acquisitions (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended		0 Months Ended
	Sep. 30, 2011	Sep. 30, 2011 years	Mar. 31, 2011	Sep. 03, 2011 Domestic Transport Inc. [Member]	Jun. 03, 2011 Domestic Transport Inc. [Member]	Sep. 30, 2011 Domestic Transport Inc. [Member]	Mar. 31, 2011 ETS [Member]
Business Acquisition [Line Items]
Acquisition date		April 1, 2011			June 3, 2011
Acquisition of purchase price	$ 90,100,000	$ 90,100,000		$ 600,000
Purchase price			82,187,000	700,000			83,400,000
Business acquisition cash on hand		8,000,000
Working capital adjustment	7,900,000	7,900,000
Purchase price after working capital adjustment	82,200,000	82,200,000
Costs incurred prior to the acquisition	1,700,000	1,700,000
Due diligence and integration costs, total	800,000	2,800,000
Goodwill amortization of period (years)		15
Amortization expense related to acquisition	200,000	400,000
Number of drivers					22
Installments				25,000
Purchase price allocation, payment						100,000
Purchase price allocation, equipment						200,000
Purchase price allocation, goodwill			29,389,000			400,000
Tax deductible goodwill	25,600,000	25,600,000
Goodwill additional tax deductible		$ 5,000,000

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