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Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from operations	$ 6,260,077	$ 5,256,328	$ 4,015,129
LTL Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from operations	6,177,055	5,177,497	3,961,054
Other Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from operations	$ 83,022	$ 78,831	$ 54,075

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