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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property, Plant and Equipment [Line Items] |  |  |
Restricted cash | $ 0 | $ 0 |
Goodwill | 188,441,000 | 188,409,000 | $ 188,434,000
Capitalized computer software, net | 9,900,000 | 8,000,000.0 |
Capitalized computer software, amortization | 3,400,000 | 1,900,000 | 1,800,000
Research and development expense | 8,600,000 | 7,500,000 | 5,300,000
Transportation Solutions |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Goodwill | 120,506,000 | 120,486,000 | $ 120,502,000
Parts & Services |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Goodwill | $ 67,900,000 |  |
Buildings and building improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 33 years |  |
Used trailers |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Accounts payable, trade | $ 0 | $ 500,000 |
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Capitalized computer software, amortization period | 3 years |  |
Standard product warranty, coverage period | 1 year |  |
Minimum | Machinery and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Capitalized computer software, amortization period | 7 years |  |
Standard product warranty, coverage period | 5 years |  |
Maximum | Machinery and equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment, useful life | 10 years |  |
DuraPlate Trailer Panels |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Standard product warranty, coverage period | 10 years |  |

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