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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Restricted cash | $ 0 |  |  | $ 0 | $ 0 | $ 0 |
Goodwill | 188,443,000 |  |  | 199,560,000 | 188,443,000 | 199,560,000 | $ 311,026,000
Asset impairment |  |  | $ 800,000 |  | 29,163,000 | 107,114,000 | 0
Capitalized computer software, net | 4,200,000 |  |  | 6,100,000 | 4,200,000 | 6,100,000 |
Capitalized computer software, amortization |  |  |  |  | 1,700,000 | 2,000,000 | 1,700,000
Research and development expense |  |  |  |  | 13,600,000 | 21,900,000 | 19,500,000
Trade names and trademarks |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Asset impairment | 28,300,000 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Beall Tank Trailers |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets |  |  |  | 1,100,000 |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Extract Technology |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Impairment of intangible assets |  | $ 1,300,000 |  |  |  |  |
Transportation Solutions |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Goodwill | 120,507,000 |  |  | 120,518,000 | 120,507,000 | 120,518,000 | $ 193,488,000
Transportation Solutions | Trade names and trademarks |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Asset impairment | 25,600,000 |  |  |  |  |  |
Parts & Services |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Goodwill | 67,900,000 |  |  |  | $ 67,900,000 |  |
Parts & Services | Trade names and trademarks |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Asset impairment | 2,700,000 |  |  |  |  |  |
Buildings and building improvements |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, estimated useful lives |  |  |  |  | 33 years |  |
Used trailers |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Accounts payable, trade | $ 0 |  |  | $ 0 | $ 0 | $ 0 |
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, estimated useful lives |  |  |  |  | three |  |
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, estimated useful lives |  |  |  |  | ten years |  |
DuraPlate Trailer Panels |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |
Standard product warranty, coverage period |  |  |  |  | 10 years |  |

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