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Goodwill and Other Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in the carrying amount of goodwill during the nine months ended September 30, 2021 are summarized as follows:
| Expedited Freight |  | Intermodal |  | Consolidated
Balance as of December 31, 2020 | $ | 165,268 |  |  | $ | 79,714 |  |  | $ | 244,982 |
Acquisitions | 3,545 |  |  | 6,249 |  |  | 9,794 |
Balance as of September 30, 2021 | $ | 168,813 |  |  | $ | 85,963 |  |  | $ | 254,776 |
Schedule of Other Intangible Assets | Changes in the carrying amount of acquired intangible assets during the nine months ended September 30, 2021 are summarized as follows:
|  | Gross Carrying Amount
|  | Customer Relationships 1 |  | Non-Compete Agreements |  | Trade Names |  | Total
Balance as of December 31, 2020 |  | $ | 228,416 |  |  | $ | 8,125 |  |  | $ | 1,500 |  |  | $ | 238,041 |
Acquisitions |  | 7,640 |  |  | 150 |  |  | — |  |  | 7,790 |
Balance as of September 30, 2021 |  | $ | 236,056 |  |  | $ | 8,275 |  |  | $ | 1,500 |  |  | $ | 245,831 |
|  | Accumulated Amortization
|  | Customer Relationships 1 |  | Non-Compete Agreements |  | Trade Names |  | Total
Balance as of December 31, 2020 |  | $ | 85,930 |  |  | $ | 5,579 |  |  | $ | 1,500 |  |  | $ | 93,009 |
Amortization expense |  | 9,652 |  |  | 974 |  |  | — |  |  | 10,626 |
Balance as of September 30, 2021 |  | $ | 95,582 |  |  | $ | 6,553 |  |  | $ | 1,500 |  |  | $ | 103,635 |
1 Carrying value as of September 30, 2021 and December 31, 2020 is inclusive of $16,501 of accumulated impairment.

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- Definition Tabular disclosure of amortization expense of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References No definition available. + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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