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Acquisitions (Narrative) (Details) (USD $) | 12 Months Ended |  | 0 Months Ended |  |  |  | 12 Months Ended |
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Dec. 31, 2011 years | Dec. 31, 2010 | Dec. 31, 2009 | Mar. 31, 2011 | Oct. 03, 2011 Challenge Transport Inc [Member] | Jun. 03, 2011 Domestic Transport Inc. [Member] | Dec. 31, 2011 ETS [Member] | Sep. 30, 2011 ETS [Member] | Jun. 30, 2011 ETS [Member] | Dec. 31, 2011 Mode [Member] | Dec. 31, 2011 Agency/Customer Relationships [Member] | Oct. 03, 2011 Customer Relationships [Member] Challenge Transport Inc [Member] | Oct. 03, 2011 Driver Relationships [Member] Challenge Transport Inc [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition |  |  |  |  | October 3, 2011 | June 3, 2011 |  |  | April 1, 2011 |  |  |  |
Purchase price, stock |  |  |  |  |  |  |  |  | $ 83,400,000 |  |  |  |
Purchase price |  |  |  | 82,187,000 | 2,500,000 | 700,000 |  |  | 90,100,000 |  |  |  |
Business acquisition cash on hand |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |
Working capital adjustment |  |  |  |  |  |  |  | 7,900,000 |  |  |  |  |
Purchase price after working capital adjustment |  |  |  |  |  |  | 82,200,000 |  |  |  |  |  |
Costs incurred prior to the acquisition | 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of independent business owners |  |  |  |  |  |  |  |  |  | 97 |  |  |
Number of sales agents |  |  |  |  |  |  |  |  |  | 128 |  |  |
Integration costs | 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill amortization period (years) | 15 |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense related to acquisition | 1,300,000 | 500,000 | 400,000 |  |  |  |  |  |  |  | 600,000 |  |
Number of drivers |  |  |  |  | 41 | 22 |  |  |  |  |  |  |
Number of installment payments |  |  |  |  | 4 | 4 |  |  |  |  |  |  |
Initial installment payment |  |  |  |  | 2,000,000 | 600,000 |  |  |  |  |  |  |
Subsequent installment payments |  |  |  |  | 125,000 | 25,000 |  |  |  |  |  |  |
Purchase price allocation, driver and customer relationships |  |  |  |  |  | 100,000 |  |  |  |  |  | 1,300,000 | 300,000
Purchase price allocation, tractors |  |  |  |  |  | 200,000 |  |  |  |  |  |  |
Purchase price allocation, goodwill |  |  |  | 29,389,000 | 900,000 | 400,000 |  |  |  |  |  |  |
Tax deductible goodwill | 25,800,000 |  |  |  |  |  |  |  |  |  |  |  |
Assumed liabilities | $ 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |

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