Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Contract with Customer, Asset, after Allowance for Credit Loss	$ 1,900		$ 1,900		$ 1,900
Operating Revenue	259,861	$ 295,026	804,935	$ 932,111
Accessorial and other revenues	18,400	22,400	58,600	71,700
fuel surcharge [Member]
Disaggregation of Revenue [Line Items]
Fuel surcharge revenue	$ 32,800	$ 42,900	$ 105,900	$ 134,100