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Long-Term Debt And Financing Arrangements (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2011 | Mar. 31, 2011 | Dec. 31, 2011 | Aug. 01, 2011 | Dec. 31, 2010
Interest rate under the credit agreement | The interest rate under the Credit Agreement is equal to LIBOR plus 1.75%. |  |  |  |
Current unsecured borrowing capacity | $ 10.0 | $ 10.0 |  |  |
Maximum unsecured borrowing capacity | 50.0 | 50.0 |  |  |
Amount increase over LIBOR to determine interest rate of the credit agreement |  | 1.75% |  |  |
Line of credit, expiration date |  | March 2014 |  |  |
Letter of credit expiration, year |  |  | 2012 |  |
Minimum net worth | 300.0 | 300.0 |  |  |
Commitment fee charged on the unused line of credit |  | 0.375% |  |  |
Outstanding letters of credit |  |  | 2.6 |  |
Unused and available borrowings under bank revolving line of credit |  |  | 47.4 |  | 7.4
Number of chassis leased |  |  |  | 3,126 |
Chassis, lease agreement period (years) |  |  | 10 |  |
Capital lease interest paid |  |  | $ 0.3 |  |
Maximum [Member] |  |  |  |  |
Cash Flow Leverage Ratio |  | 2.0 |  |  |

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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Subparagraph b -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount, during the lease term, of each minimum [capital] lease payment allocated to interest expense so as to produce a constant periodic rate of interest on the remaining balance of the capital lease obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 35 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6916424&loc=d3e43161-112731 + Details
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