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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
Changes in the carrying amount of goodwill during the nine months ended September 30, 2023 are summarized as follows:
Expedited FreightIntermodalConsolidated
Balance as of December 31, 2022$169,288 $136,896 $306,184 
Acquisition50,443 136 50,579 
Balance as of September 30, 2023$219,731 $137,032 $356,763 
Schedule of Other Intangible Assets
Changes in the carrying amount of acquired intangible assets during the nine months ended September 30, 2023 are summarized as follows:

Gross Carrying Amount
Customer Relationships1
Non-Compete AgreementsTrade NamesTotal
Balance as of December 31, 2022$267,870 $8,756 $1,500 $278,126 
Acquisition4,513 873 — 5,386 
Balance as of September 30, 2023$272,383 $9,629 $1,500 $283,512 

Accumulated Amortization
Customer Relationships1
Non-Compete AgreementsTrade NamesTotal
Balance as of December 31, 2022$114,380 $7,445 $1,500 $123,325 
Amortization expense12,980 497 — 13,477 
Balance as of September 30, 2023$127,360 $7,942 $1,500 $136,802 
1 Carrying value as of September 30, 2023 and December 31, 2022 is inclusive of $16,501 of accumulated impairment.