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Significant Accounting Policies (Estimated Useful Lives Of Property And Equipment) (Details) | 12 Months Ended
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Dec. 31, 2017
Leasehold Improvements [Member] |
Significant Accounting Policies [Line Items] |
Estimated useful lives of assets | Lesser of economic life or life of lease
Minimum [Member] | Structures [Member] |
Significant Accounting Policies [Line Items] |
Estimated useful lives of asset, years | 7 years
Minimum [Member] | Revenue Equipment [Member] |
Significant Accounting Policies [Line Items] |
Estimated useful lives of asset, years | 4 years
Minimum [Member] | Other Equipment [Member] |
Significant Accounting Policies [Line Items] |
Estimated useful lives of asset, years | 2 years
Maximum [Member] | Structures [Member] |
Significant Accounting Policies [Line Items] |
Estimated useful lives of asset, years | 30 years
Maximum [Member] | Revenue Equipment [Member] |
Significant Accounting Policies [Line Items] |
Estimated useful lives of asset, years | 15 years
Maximum [Member] | Other Equipment [Member] |
Significant Accounting Policies [Line Items] |
Estimated useful lives of asset, years | 20 years

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- Definition Significant Accounting Policies [Line Items] + References No definition available. + 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=84158767&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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