Goodwill and Intangible Assets (Goodwill by Segment) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Increase (Decrease) in Goodwill [Roll Forward]
Balance at 12/31/20	$ 0
Goodwill recorded in acquisition of ECM	44,710
Goodwill recorded in acquisition of NEHDS	36,534
Purchase accounting adjustments	(6,626)
Balance at 12/31/21	74,618
TTS
Increase (Decrease) in Goodwill [Roll Forward]
Balance at 12/31/20	0
Goodwill recorded in acquisition of ECM	44,710
Goodwill recorded in acquisition of NEHDS	0
Purchase accounting adjustments	(6,626)
Balance at 12/31/21	38,084
Werner Logistics
Increase (Decrease) in Goodwill [Roll Forward]
Balance at 12/31/20	0
Goodwill recorded in acquisition of ECM	0
Goodwill recorded in acquisition of NEHDS	36,534
Purchase accounting adjustments	0
Balance at 12/31/21	$ 36,534