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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Accounting Policies [Abstract] |
Estimated Useful Lives Of Property And Equipment | Depreciation of property and equipment is calculated using the straight-line method over the estimated useful lives of the related assets. The following table provides the estimated useful lives by asset type:
Structures |  | 7 to 30 years
Revenue equipment |  | 4 to 15 years
Other equipment |  | 2 to 20 years
Leasehold improvements |  | Lesser of economic life or life of lease
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] |
|  | Year Ended December 31,
(In thousands) |  | 2015 |  | 2014 |  | 2013
Acquisition of property and equipment by capital lease |  | $ | 3,552 |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: 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 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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- Definition Tabular disclosure of supplemental cash flow information for the periods presented. + References No definition available. + Details
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