Earnings Per Share (Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net Income attributable to Werner	$ 55,051	$ 63,761	$ 181,090	$ 182,285
Weighted average common shares outstanding	63,386	67,475	64,433	67,776
Dilutive effect of stock-based awards	396	359	386	360
Shares used in computing diluted earnings per share	63,782	67,834	64,819	68,136
Basic earnings per share	$ 0.87	$ 0.94	$ 2.81	$ 2.69
Diluted earnings per share	$ 0.86	$ 0.94	$ 2.79	$ 2.68