Acquisitions, Goodwill and Other Long-Lived Assets Carrying Value of Goodwill (Details) $ in Thousands |
12 Months Ended | ||
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Dec. 31, 2020
USD ($)
numberOfSegments
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Dec. 31, 2019
USD ($)
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Dec. 31, 2018
USD ($)
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| Goodwill [Line Items] | |||
| Number of Reportable Segments | numberOfSegments | 2 | ||
| Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ 165,839 | ||
| Accumulated impairment loss | (25,686) | ||
| Goodwill, Net | 244,982 | $ 215,699 | $ 193,686 |
| Goodwill, Acquired During Period | 29,283 | 22,013 | |
| Expedited Freight | |||
| Goodwill [Line Items] | |||
| Goodwill, Net | 165,268 | 137,034 | 117,071 |
| Goodwill, Acquired During Period | 28,234 | 19,963 | |
| Intermodal [Member] | |||
| Goodwill [Line Items] | |||
| Goodwill, Net | 79,714 | 78,665 | $ 76,615 |
| Goodwill, Acquired During Period | $ 1,049 | $ 2,050 | |
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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. No definition available.
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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