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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2012
Significant Accounting Policies [Abstract] |
Property, Plant and Equipment [Table Text Block] |
Lives of the assets are as follows: |
| Years
Land improvements and buildings | 5-30
Furniture and fixtures | 3-5
Shop & service equipment | 3-10
Revenue equipment | 5-7
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block] | A reconciliation of the numerator (net income) and denominator (weighted average number of shares outstanding of the basic and diluted earnings per share ("EPS") for 2012 and 2011 is as follows (in thousands, except per share data):
| 2012
| Net Income (numerator) |  | Shares (denominator) |  | Per Share Amount
Basic EPS | $ | 61,541 |  |  | 85,892 |  |  | $ | 0.72 |
Effect of restricted stock | — |  |  | 309 |  |  |
Diluted EPS | $ | 61,541 |  |  | 86,201 |  |  | $ | 0.71 |
| 2011
| Net Income (numerator) |  | Shares (denominator) |  | Per Share Amount
Basic EPS | $ | 69,932 |  |  | 89,656 |  |  | $ | 0.78 |
Effect of restricted stock | — |  |  | 17 |  |  |
Diluted EPS | $ | 69,932 |  |  | 89,673 |  |  | $ | 0.78 |

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- Definition No authoritative reference available. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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