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Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue from operations	$ 1,470,211	$ 1,515,277	$ 4,428,981	$ 4,370,602
LTL Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Total revenue from operations	1,457,108	1,501,266	4,388,808	4,323,453
Other Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Total revenue from operations	$ 13,103	$ 14,011	$ 40,173	$ 47,149

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