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GOODWILL & OTHER INTANGIBLE ASSETS - Schedule of Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross | $ 296,836 | $ 296,823 | $ 296,807 | $ 296,809 | $ 296,834
Goodwill, Impaired, Accumulated Impairment Loss | (108,400) | (108,400) | (108,400) | (108,400) | (108,400)
Net goodwill | 188,436 | 188,423 | 188,407 | 188,409 | 188,434
Effects of foreign currency | 13 | 16 | (2) | (25) |
Transportation Solutions |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross | 188,760 | 188,751 | 188,741 | 188,743 | 188,759
Goodwill, Impaired, Accumulated Impairment Loss | (68,257) | (68,257) | (68,257) | (68,257) | (68,257)
Net goodwill | 120,503 | 120,494 | 120,484 | 120,486 | 120,502
Effects of foreign currency | 9 | 10 | (2) | (16) |
Parts & Services |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, gross | 108,076 | 108,072 | 108,066 | 108,066 | 108,075
Goodwill, Impaired, Accumulated Impairment Loss | (40,143) | (40,143) | (40,143) | (40,143) | (40,143)
Net goodwill | 67,933 | 67,929 | 67,923 | 67,923 | $ 67,932
Effects of foreign currency | $ 4 | $ 6 | $ 0 | $ (9) |

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