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Capital Lease And Financing Arrangements	3 Months Ended
	Mar. 31, 2012
Capital Lease And Financing Arrangements [Abstract]
Capital Lease And Financing Arrangements	NOTE 7. Capital Lease and Financing Arrangements We have standby letters of credit that expire at various dates in 2012. As of March 31, 2012, the outstanding letters of credit totaled $2.6 million. We had $47.4 million of unused and available borrowings under our bank revolving line of credit as of March 31, 2012. We were in compliance with our debt covenants as of March 31, 2012. On August 1, 2011, we entered into an agreement to lease 3,126 chassis for a period of 10 years. We are accounting for this lease as a capital lease. Interest on this capital lease obligation is based on interest rates that approximate currently available interest rates. We paid interest of $0.2 million related to this capital lease during the quarter ended March 31, 2012.

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The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 2, 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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