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Significant Accounting Policies (Estimated Useful Lives Of Property And Equipment) (Details) | 12 Months Ended
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Dec. 31, 2012
Structures [Member] |
Significant Accounting Policies [Line Items] |
Estimated minimum useful lives of asset, years | 7
Estimated maximum useful lives of asset, years | 30
Revenue Equipment [Member] |
Significant Accounting Policies [Line Items] |
Estimated minimum useful lives of asset, years | 4
Estimated maximum useful lives of asset, years | 15
Other Equipment [Member] |
Significant Accounting Policies [Line Items] |
Estimated minimum useful lives of asset, years | 2
Estimated maximum useful lives of asset, years | 20
Leasehold Improvements [Member] |
Significant Accounting Policies [Line Items] |
Estimated useful lives of assets | Lesser of economic life or life of lease

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- Details
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- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 + 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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