Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Contract with Customer, Asset, Net [Abstract]
Contract with Customer, Asset, Net	$ 1,900	$ 2,600
Operating Revenues	1,207,500	968,000	$ 607,300
Fuel surcharge revenue	173,800	169,200	76,100
Accessorial, brokerage and other revenues	94,800	50,700	$ 11,400
Deposit Contracts, Liabilities	$ 0	$ 0