Income Taxes	9 Months Ended
Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the three-month and nine-month periods ended September 30, 2012, there were no material changes to the total amount of unrecognized tax benefits. We accrued interest of $8 thousand during the three-month period and $159 thousand during the nine-month period ended September 30, 2012. Our total gross liability for unrecognized tax benefits at September 30, 2012 is $11.3 million. If recognized, $7.2 million of unrecognized tax benefits would impact our effective tax rate. Interest of $3.5 million has been reflected as a component of the total liability. We expect no other significant increases or decreases for uncertain tax positions during the next twelve months. We file U.S. federal income tax returns, as well as income tax returns in various states and several foreign jurisdictions. The years 2009 through 2011 are open for examination by the Internal Revenue Service (“IRS”), and various years are open for examination by state and foreign tax authorities. State and foreign jurisdictional statutes of limitations generally range from three to four years. In May 2010, the IRS began an audit of our 2007 and 2008 federal income tax returns. During the second quarter of 2012, we received a notice of deficiency including proposed penalties related to our like-kind exchange program for tractors and trailers (such program was discontinued in 2010). The proposed tax deficiency relates to timing differences for recognition of gains on sales of equipment and if upheld would allow us to file for tax refunds for tax years 2009-2011 relating to additional depreciation deductions. If the IRS position is upheld, we would be subject to interest charges, which we estimate as of September 30, 2012 to be approximately $2 million after considering the tax deductibility of the interest payments, and we believe it is unlikely that the IRS would prevail in the assessment of penalties. On July 19, 2012, we filed a petition in the United States Tax Court to contest the deficiency. The IRS responded to our petition at the end of September 2012, and we have until early November 2012 to file a reply to the IRS response. We believe our tax position complies with applicable tax law, and we will vigorously defend against the IRS position in tax court. We have not accrued a liability for any proposed penalties or interest because we believe we will ultimately prevail in this matter.

Income Taxes

9 Months Ended

Sep. 30, 2012

For the three-month and nine-month periods ended September 30, 2012, there were no material changes to the total amount of unrecognized tax benefits. We accrued interest of $8 thousand during the three-month period and $159 thousand during the nine-month period ended September 30, 2012. Our total gross liability for unrecognized tax benefits at September 30, 2012 is $11.3 million. If recognized, $7.2 million of unrecognized tax benefits would impact our effective tax rate. Interest of $3.5 million has been reflected as a component of the total liability. We expect no other significant increases or decreases for uncertain tax positions during the next twelve months.

We file U.S. federal income tax returns, as well as income tax returns in various states and several foreign jurisdictions. The years 2009 through 2011 are open for examination by the Internal Revenue Service (“IRS”), and various years are open for examination by state and foreign tax authorities. State and foreign jurisdictional statutes of limitations generally range from three to four years.

In May 2010, the IRS began an audit of our 2007 and 2008 federal income tax returns. During the second quarter of 2012, we received a notice of deficiency including proposed penalties related to our like-kind exchange program for tractors and trailers (such program was discontinued in 2010). The proposed tax deficiency relates to timing differences for recognition of gains on sales of equipment and if upheld would allow us to file for tax refunds for tax years 2009-2011 relating to additional depreciation deductions. If the IRS position is upheld, we would be subject to interest charges, which we estimate as of September 30, 2012 to be approximately $2 million after considering the tax deductibility of the interest payments, and we believe it is unlikely that the IRS would prevail in the assessment of penalties. On July 19, 2012, we filed a petition in the United States Tax Court to contest the deficiency. The IRS responded to our petition at the end of September 2012, and we have until early November 2012 to file a reply to the IRS response. We believe our tax position complies with applicable tax law, and we will vigorously defend against the IRS position in tax court. We have not accrued a liability for any proposed penalties or interest because we believe we will ultimately prevail in this matter.