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Summary of Significant Accounting Polices (Tables) | 12 Months Ended
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Dec. 31, 2012
Accounting Policies [Abstract] |
Schedule of Estimated Useful Life | For financial reporting purposes, assets are generally depreciated using the following estimated useful lives and salvage values:
|  | Lives |  | Salvage Values
Building and improvements |  | 30 years |  | 0%
Tractors |  | 80 months |  | 0%
Trailers |  | 12 years |  | $1,000
Service and other equipment |  | 3-10 years |  | 0%
Schedule Of Common Stock And Earnings Per Share | The computation of basic and diluted earnings per share is shown below (in thousands, except per share amounts).
| Years Ended December 31,
| 2012 |  | 2011 |  | 2010
Net income | $ | 103,034 |  |  | $ | 102,757 |  |  | $ | 80,039 |
Weighted average common shares outstanding | 72,909 |  |  | 72,787 |  |  | 72,369 |
Dilutive effect of stock-based awards | 544 |  |  | 438 |  |  | 438 |
Shares used in computing diluted earnings per share | 73,453 |  |  | 73,225 |  |  | 72,807 |
Basic earnings per share | $ | 1.41 |  |  | $ | 1.41 |  |  | $ | 1.11 |
Diluted earnings per share | $ | 1.40 |  |  | $ | 1.40 |  |  | $ | 1.10 |

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- Definition Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. + 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-Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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