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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Disaggregated Revenue [Table Text Block] |
|  | Year Ended December 31,
(In thousands) |  | 2017 |  | 2016 |  | 2015
LTL services |  | $ | 3,303,611 |  |  | $ | 2,939,572 |  |  | $ | 2,893,683 |
Other services |  | 54,501 |  |  | 51,945 |  |  | 78,759 |
Total revenue |  | $ | 3,358,112 |  |  | $ | 2,991,517 |  |  | $ | 2,972,442 |
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) |  | 2017 |  | 2016 |  | 2015
Acquisition of property and equipment by capital lease |  | $ | — |  |  | $ | — |  |  | $ | 3,552 |

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