GOODWILL & OTHER INTANGIBLE ASSETS - Schedule of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2023	Mar. 31, 2024	Dec. 31, 2022
Goodwill [Line Items]
Goodwill, gross		$ 296,809	$ 296,807	$ 296,834
Accumulated impairment losses		(108,400)	(108,400)	(108,400)
Net goodwill		188,409	188,407	188,434
Effects of foreign currency	$ (2)	(25)
Transportation Solutions
Goodwill [Line Items]
Goodwill, gross		188,743	188,741	188,759
Accumulated impairment losses		(68,257)	(68,257)	(68,257)
Net goodwill		120,486	120,484	120,502
Effects of foreign currency	(2)	(16)
Parts & Services
Goodwill [Line Items]
Goodwill, gross		108,066	108,066	108,075
Accumulated impairment losses		(40,143)	(40,143)	(40,143)
Net goodwill		67,923	$ 67,923	$ 67,932
Effects of foreign currency	$ 0	$ (9)