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ACCOUNTING POLICIES (Property) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Held-for-sale | Other long-term assets |  |
Property, Plant and Equipment |  |
Assets held for sale which are reported within other noncurrent assets | $ 1.4 | $ 1.2
Structures | Minimum |  |
Property, Plant and Equipment |  |
Depreciation/amortization period | 15 years |
Structures | Maximum |  |
Property, Plant and Equipment |  |
Depreciation/amortization period | 60 years |
Revenue equipment | Minimum |  |
Property, Plant and Equipment |  |
Depreciation/amortization period | 3 years |
Revenue equipment | Maximum |  |
Property, Plant and Equipment |  |
Depreciation/amortization period | 14 years |
Service, office, and other equipment | Minimum |  |
Property, Plant and Equipment |  |
Depreciation/amortization period | 2 years |
Service, office, and other equipment | Maximum |  |
Property, Plant and Equipment |  |
Depreciation/amortization period | 15 years |
Software | Minimum |  |
Property, Plant and Equipment |  |
Depreciation/amortization period | 2 years |
Software | Maximum |  |
Property, Plant and Equipment |  |
Depreciation/amortization period | 7 years |

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- Definition Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of after one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=65878427&loc=d3e1107-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2510-110228 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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