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Acquisitions, Goodwill and Other Long-Lived Assets Carrying Value of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | $ 112,527 |  |
Goodwill, Net | 191,671 | $ 184,675 |
Goodwill, Acquired During Period | 6,996 |  |
Amortization expense of acquired intangible assets | $ 10,193 | 10,122 | $ 10,905
Customer Relationships [Member] |  |  |
Goodwill [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years 10 months 11 days |  |
Noncompete Agreements [Member] |  |  |
Goodwill [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 5 years 2 months 11 days |  |
Trade Names [Member] |  |  |
Goodwill [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 4 years 11 days |  |
Atlantic [Member] | Customer Relationships [Member] |  |  |
Goodwill [Line Items] |  |  |
Weighted average useful lives of acquired intangible assets | 15 years |  |
Atlantic [Member] | Noncompete Agreements [Member] |  |  |
Goodwill [Line Items] |  |  |
Weighted average useful lives of acquired intangible assets | 5 years |  |
KCL [Member] | Customer Relationships [Member] |  |  |
Goodwill [Line Items] |  |  |
Weighted average useful lives of acquired intangible assets | 15 years |  |
KCL [Member] | Noncompete Agreements [Member] |  |  |
Goodwill [Line Items] |  |  |
Weighted average useful lives of acquired intangible assets | 2 years |  |
Expedited LTL [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Net | $ 97,593 | 97,593 |
Truckload Premium Services [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Net | 45,164 | 45,164 |
Accumulated impairment loss | (25,686) | (25,686) |
Pool Distribution [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Net | 12,359 | 12,359 |
Accumulated impairment loss | (6,953) | (6,953) |
Intermodal [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Net | 69,194 | $ 62,198 |
Goodwill, Acquired During Period | $ 6,996 |  |
Triumph & Ace [Member] | Customer Relationships [Member] |  |  |
Goodwill [Line Items] |  |  |
Weighted average useful lives of acquired intangible assets | 15 years |  |
Triumph & Ace [Member] | Noncompete Agreements [Member] |  |  |
Goodwill [Line Items] |  |  |
Weighted average useful lives of acquired intangible assets | 5 years |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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