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Significant Accounting Policies Property, Equipment and Depreciation (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
Property, Plant and Equipment |  |  |  |
Amortization Period of Tires | 2 years |  |  |
Percentage of Tractor Fleet Depreciated at 150 Percent | 100.00% | 68.00% | 54.00% | 0.00%
Depreciation | $ 57,226,000 | $ 61,949,000 | $ 58,730,000 |
Communications and Utilities Expense [Member] |  |  |  |
Property, Plant and Equipment |  |  |  |
Depreciation | 700,000 |  |  |
Tractors [Member] |  |  |  |
Property, Plant and Equipment |  |  |  |
Property, Plant, and Equipment, Salvage Value | 15,000 |  |  |
Trailers [Member] |  |  |  |
Property, Plant and Equipment |  |  |  |
Property, Plant, and Equipment, Salvage Value | $ 4,000 |  |  |
Land Improvements and Buildings [Member] |  |  |  |
Property, Plant and Equipment |  |  |  |
Property, Plant and Equipment, Useful Life, Minimum | 5 |  |  |
Property, Plant and Equipment, Useful Life, Maximum | 30 |  |  |
Furniture and Fixtures [Member] |  |  |  |
Property, Plant and Equipment |  |  |  |
Property, Plant and Equipment, Useful Life, Minimum | 3 |  |  |
Property, Plant and Equipment, Useful Life, Maximum | 5 |  |  |
Shop and Service Equipment [Member] |  |  |  |
Property, Plant and Equipment |  |  |  |
Property, Plant and Equipment, Useful Life, Minimum | 3 |  |  |
Property, Plant and Equipment, Useful Life, Maximum | 10 |  |  |
Revenue Equipment [Member] |  |  |  |
Property, Plant and Equipment |  |  |  |
Property, Plant and Equipment, Useful Life, Minimum | 5 |  |  |
Property, Plant and Equipment, Useful Life, Maximum | 7 |  |  |

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- Definition Amortization Period of Tires + References No definition available. + Details
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- Definition Percentage of Tractor Fleet Depreciated at 150 Percent + References No definition available. + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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- Details
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- Definition The estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose). + References No definition available. + Details
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- Definition The maximum useful life of long-lived, physical assets used in the normal conduct of business 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 No definition available. + Details
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- Definition The minimum useful life of long lived, physical assets used in the normal conduct of business 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 No definition available. + Details
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