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Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue from operations	$ 1,667,448	$ 1,319,409	$ 3,164,728	$ 2,445,924
LTL Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from operations	1,644,659	1,299,760	3,120,440	2,409,382
Other Service Revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from operations	$ 22,789	$ 19,649	$ 44,288	$ 36,542

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

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