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GOODWILL & OTHER INTANGIBLE ASSETS - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 segment | Mar. 31, 2022 USD ($) segment | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Goodwill [Line Items] |  |  |  |  |
Number of operating segments | segment | 2 | 2 |  |  |
Number of segments | segment | 2 | 2 |  |  |
Goodwill |  | $ 188,438 |  | $ 188,443 | $ 199,560
Impact of divestiture on goodwill |  |  |  | 11,101 |
Transportation Solutions |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  | 120,504 |  | 120,507 | 120,518
Impact of divestiture on goodwill |  |  |  | 0 |
Parts & Services |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  | $ 67,934 |  | $ 67,936 | $ 79,042
Parts & Services | Extract Technology |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Impact of divestiture on goodwill |  |  | $ 11,100 |  |

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