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GOODWILL & OTHER INTANGIBLE ASSETS - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) segment | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Goodwill [Line Items] |  |  |  |  |  |
Number of operating segments | segment |  | 2 |  |  |  |
Number of segments | segment |  | 2 |  |  |  |
Goodwill | $ 188,436 | $ 188,436 | $ 188,423 | $ 188,407 | $ 188,409 | $ 188,434
Goodwill and intangible asset impairment | 0 | 0 |  |  |  |
Transportation Solutions |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 120,503 | 120,503 | 120,494 | 120,484 | 120,486 | 120,502
Parts & Services |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 67,933 | $ 67,933 | $ 67,929 | $ 67,923 | $ 67,923 | $ 67,932

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