Revenue (Disaggregation of Revenue by Revenue Source) (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
Revenues	$ 836,276	$ 649,814	$ 1,600,881	$ 1,266,260
Truckload Transportation Services
Disaggregation of revenue
Revenues	613,616	491,200	1,172,033	954,149
Werner Logistics
Disaggregation of revenue
Revenues	203,861	141,673	392,869	279,526
Transportation Services
Disaggregation of revenue
Revenues	816,852	632,680	1,563,555	1,233,348
Other revenues
Disaggregation of revenue
Revenues	$ 19,424	$ 17,134	$ 37,326	$ 32,912