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Goodwill and Other Intangible Assets - Goodwill Roll Forward (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Goodwill [Roll Forward]  
Beginning balance $ 244,982
Acquisition 5,754
Ending balance 250,736
Expedited Freight  
Goodwill [Roll Forward]  
Beginning balance 165,268
Acquisition 0
Ending balance 165,268
Intermodal  
Goodwill [Roll Forward]  
Beginning balance 79,714
Acquisition 5,754
Ending balance $ 85,468