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Guarantees	9 Months Ended
	Sep. 30, 2011
Guarantees [Abstract]
Guarantees	NOTE 6. Guarantees We are guaranteeing certain tractor lease payments. The guarantees expire at various dates beginning in 2012 through 2017. The potential maximum exposure under these lease guarantees was approximately $16.8 million and $6.8 million as of September 30, 2011 and December 31, 2010, respectively. The potential maximum exposure represents the amount of the remaining lease payments on all outstanding guaranteed leases as of September 30, 2011 and December 31, 2010. However, upon default, we have the option to purchase the tractors. We could then sell the tractors and use the proceeds to recover all or a portion of the amounts paid under the guarantees. There were no material defaults during the quarter ended September 30, 2011. As of September 30, 2011 and December 31, 2010, respectively, the liability was approximately $0.3 million and $0.1 million, for the guarantees representing the fair value of the guarantees based on a discounted cash-flow analysis. We are amortizing the liability over the remaining lives of the respective guarantees.

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The entire disclosure for each guarantee obligation, or each group of similar guarantee obligations, including (a) the nature of the guarantee, including its term, how it arose, and the events or circumstances that would require the guarantor to perform under the guarantee; (b) the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee; (c) the current carrying amount of the liability, if any, for the guarantor's obligations under the guarantee; and (d) the nature of any recourse provisions under the guarantee, and any assets held either as collateral or by third parties, and any relevant related party disclosure. Excludes disclosures about product warranties.

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