Earnings Per Share (Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net Income attributable to Werner	$ 53,749	$ 46,492
Weighted average common shares outstanding	65,543	67,932
Dilutive effect of stock-based awards	335	291
Shares used in computing diluted earnings per share	65,878	68,223
Basic earnings per share	$ 0.82	$ 0.68
Diluted earnings per share	$ 0.82	$ 0.68