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Acquisitions - Intermodal Acquisition Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 28, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Business Acquisition [Line Items] |  |  |  |
Change in fair value of earn-out liability |  |  | $ (385) | $ (2,209)
Proficient Transport |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Net assets acquired and earn-out | $ 15,510 |  |  |
Earn-out payment, up to | $ 2,000 |  |  |
Earnout period | 1 year |  |  |
Earnout opportunity | $ 829 | $ 496 | 496 |
Change in fair value of earn-out liability |  | $ 0 | $ (333) |

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