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Change in Estimate
9 Months Ended
Sep. 30, 2011
New Accounting Standards and Change in Estimate [Abstract] 
Change in Estimate
Note 14. Change in Estimate
In the first quarter of 2010, management undertook an evaluation of the Company’s revenue equipment and concluded that it would be more cost effective to scrap approximately 7,000 dry van trailers rather than to maintain them in the operating fleet and is now in the process of scrapping them. These trailers did not qualify for assets held for sale treatment and were thus considered long-lived assets held and used. As a result, management revised its previous estimates regarding remaining useful lives and estimated residual values for these trailers, resulting in incremental depreciation expense in the first quarter of 2010 of $7.4 million. These trailers are in addition to the approximately 2,500 trailers that were reclassified to assets held for sale, as discussed in Note 11.