GOODWILL & OTHER INTANGIBLE ASSETS - Schedule of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 296,843	$ 307,960
Goodwill, Impaired, Accumulated Impairment Loss	(108,400)	(108,400)	$ (108,400)
Goodwill, net, beginning of period	188,443	199,560
Effects of foreign currency	(5)	(16)
Goodwill, end of period	296,838	296,843
Impact of divestiture on goodwill		(11,101)
Transportation Solutions
Goodwill [Roll Forward]
Goodwill, beginning of period	188,764	188,775
Goodwill, Impaired, Accumulated Impairment Loss	(68,257)	(68,257)	(68,257)
Goodwill, net, beginning of period	120,507	120,518
Effects of foreign currency	(3)	(11)
Goodwill, end of period	188,761	188,764
Impact of divestiture on goodwill		0
Parts & Services
Goodwill [Roll Forward]
Goodwill, beginning of period	108,079	119,185
Goodwill, Impaired, Accumulated Impairment Loss	(40,143)	(40,143)	$ (40,143)
Goodwill, net, beginning of period	67,936	79,042
Effects of foreign currency	(2)
Goodwill, end of period	$ 108,077	108,079
Components, parts and services
Goodwill [Roll Forward]
Effects of foreign currency		(5)
Impact of divestiture on goodwill		$ (11,101)