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Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 5,866,152	$ 6,260,077	$ 5,256,328
LTL Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	5,804,939	6,177,055	5,177,497
Other Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 61,213	$ 83,022	$ 78,831

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