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GOODWILL & OTHER INTANGIBLE ASSETS - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Roll Forward]        
Goodwill, gross $ 296,823 $ 296,807 $ 296,809 $ 296,834
Goodwill, Impaired, Accumulated Impairment Loss (108,400) (108,400) (108,400) (108,400)
Net goodwill 188,423 188,407 188,409 188,434
Effects of foreign currency 16 (2) (25)  
Transportation Solutions        
Goodwill [Roll Forward]        
Goodwill, gross 188,751 188,741 188,743 188,759
Goodwill, Impaired, Accumulated Impairment Loss (68,257) (68,257) (68,257) (68,257)
Net goodwill 120,494 120,484 120,486 120,502
Effects of foreign currency 10 (2) (16)  
Parts & Services        
Goodwill [Roll Forward]        
Goodwill, gross 108,072 108,066 108,066 108,075
Goodwill, Impaired, Accumulated Impairment Loss (40,143) (40,143) (40,143) (40,143)
Net goodwill 67,929 67,923 67,923 $ 67,932
Effects of foreign currency $ 6 $ 0 $ (9)