Revenue (Disaggregation of Revenue by Revenue Source) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of revenue
Revenues	$ 827,606	$ 702,891	$ 2,428,487	$ 1,969,151
Truckload Transportation Services
Disaggregation of revenue
Revenues	621,866	527,697	1,793,899	1,481,846
Werner Logistics
Disaggregation of revenue
Revenues	187,138	157,968	580,007	437,494
Inter-segment eliminations
Disaggregation of revenue
Revenues	(402)	(212)	(1,749)	(539)
Transportation Services
Disaggregation of revenue
Revenues	808,602	685,453	2,372,157	1,918,801
Other revenues
Disaggregation of revenue
Revenues	$ 19,004	$ 17,438	$ 56,330	$ 50,350