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Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue from operations	$ 1,413,189	$ 1,667,448	$ 2,855,325	$ 3,164,728
LTL Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from operations	1,397,815	1,644,659	2,822,187	3,120,440
Other Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from operations	$ 15,374	$ 22,789	$ 33,138	$ 44,288

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